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PSB Speakers Owners thread - Page 120

post #3571 of 5482
Quote:
Originally Posted by Toys7505 View Post

Hi guys, I have been a long time PSB owner/follower for a long time. Started out with the original Alpha ($200/pr) and have progressed throughout the years. For my secondary HT room, I'm looking for a pair of Alpha S Surround speakers - I know they are a few years old and not produced anymore. Just trying to aquire another pair to turn my 5.1 into a 7.1.....

I've checked Audiogon, Ebay, etc.....but am having no luck....

Does anyone have any leads or is willing to sell a pair, let me know......

Thanks,
Chris

ilocos boy, you sent me a PM about a pair of black Alpha S's - I tried to reply back but you are not accepting PM's or your box is full. I am interested! Can you contect me again via PM?
Thanks!
post #3572 of 5482
Quote:
Originally Posted by firebook23 View Post

yuk! 1% distortion on a 1 khz test tone that is a very poor rating. can somebody clear this up?

Well... for the most sound amplifiers known to men, the distortion depends on power output. For solid state (not tube) amplifiers, the distortions are typically very low in a wide range of power output. However, as you turn the volume higher and higher, and start pushing the amplifier towards its limits, the distortions will grow as well. A good example is the chart that shows distortion as a function of output power for Onkyo TX-NR1009 ( courtesy of Home Theatre Magazine):



Looking at the chart above, one may wonder how to report the maximum output power for the amplifier. In the past different standards were developped. One of the standards would require to report the output power when distortions reach 1%. However, other standart woud require to report power at 0.1% distortion. As you can guess, the max. power at 0.1% is lower than max. power at 1%. Thus, the same unit may have different numbers for the output power, depending what standard is used.

So, back to your question, the power output reported by Onkyo varies depending on the country, because the commonly accepted standards in different regions (USA-Canada, Europe, Asia) are different.
post #3573 of 5482
Hi

I just realized the top woofer of the 3 woofers on my t6s don't seem to make any sound, is this correct ? Do they only kick in at very loud volume I haven't tried yet?

My psb 300 sub arrives this wk what crossover should I set the t6s? 40,50,60htz? What about the c5 center and b5 surrounds, 60, 70 or 80?

Thanks
post #3574 of 5482
Thread Starter 
Hi Slyboogy.

It might be blown but perhaps since each driver is crossed over at different frequencies it might have not engaged for that particular song. Try another song or a test sweep.

I have your setup in my HT execpt I have the PSB Subseries 8 Subwoofer I have my cross over set to 80 hz.
post #3575 of 5482
Thread Starter 
Quote:
Originally Posted by dima333a View Post


So, back to your question, the power output reported by Onkyo varies depending on the country, because the commonly accepted standards in different regions (USA-Canada, Europe, Asia) are different.

I guess I have a fundamental problem with how manufactures rate the power of their products. I can't tell you how many times a friend has said "wow your Amp is only 80watts? my 200$ sony is 1000Watts"

Why can't they all just rate all channels driven at the same time with a full 20hz-20khz sweep. then give us the S/N. I am positive that companies like NAD and Anthem will see so many new sales because now that same Sony / onkyo / HK / Denon amp has 13 watts a channel instead of 1000W.

This issue I guess is not really for this tread but I though I would just rant a little
post #3576 of 5482
Quote:
Originally Posted by firebook23 View Post

I guess I have a fundamental problem with how manufactures rate the power of their products. I can't tell you how many times a friend has said "wow your Amp is only 80watts? my 200$ sony is 1000Watts"

He-he.. this is off the main road here, so I do not want to go into too much details. In a nutshell, you either change things, or you adjust yourself to live with it. In this case, the easy way is to understand the ratings. There is no simple way to convert watts per one spec to watts per another. You simply have to live with it, as well as with a few other imperfect things in life, such as war, meanness, death However, there are indirect indications of true power. If you study a bit, you will be able to guess approximate correct power'. The question is- do YOU like the sound or not?
As far as your friend goes, I would tell him that his amp is definitely very powerful and high quality. If he wants to believe that his amp is more powerful than yours, let him believe. What is the point in spending a lot of time digging info just to bring him into a state of internal unhappiness and disappointment? Ignorance is bliss.
In your case, all is based on how you like the sound. If you like it, ignore other arguments. If you don't, then look for something else.
post #3577 of 5482
Quote:
Originally Posted by slyboogy View Post

Hi

I just realized the top woofer of the 3 woofers on my t6s don't seem to make any sound, is this correct ? Do they only kick in at very loud volume I haven't tried yet?

My psb 300 sub arrives this wk what crossover should I set the t6s? 40,50,60htz? What about the c5 center and b5 surrounds, 60, 70 or 80?

Thanks

No it's not correct, it doesn't kick in at louder volumes, it should funtion full time, just like the other 2, you have a problem, don't mess with it, take it back.
post #3578 of 5482
Quote:
Originally Posted by firebook23 View Post

I guess I have a fundamental problem with how manufactures rate the power of their products. I can't tell you how many times a friend has said "wow your Amp is only 80watts? my 200$ sony is 1000Watts"

I hear ya. There should be a standard of measurement already ! At least some manufacturers will at least say "150 watts at .007% distortion" to help out so we have more of an understanding of how they are rating there wattage .

On the Denon AVR2312 they state "*105 watts per channel (8 ohms, 20 Hz - 20 kHz, THD 0.08 %), 135 watts per channel (6 ohms, 1 kHz, THD 0.7%)" Now thats how its done !
post #3579 of 5482
I have a C40 center for sale. PM me if interested.
Thanks
post #3580 of 5482
Thread Starter 
Quote:
Originally Posted by Cleveland Plasma View Post

I hear ya. There should be a standard of measurement already ! At least some manufacturers will at least say "150 watts at .007% distortion" to help out so we have more of an understanding of how they are rating there wattage .

On the Denon AVR2312 they state "*105 watts per channel (8 ohms, 20 Hz - 20 kHz, THD 0.08 %), 135 watts per channel (6 ohms, 1 kHz, THD 0.7%)" Now thats how its done !


I would say the exact opposite (with all respect) Using the above example:

105 watts is a per channel ratting... who listens to one speaker at a time on a 7 channel amp. So the maximum this amp will give if your watching a 7.1 movie is 15 watts a channel and that's only if your speakers are 8 ohms.

Now if your speakers are 6 ohms or below they give you the helpful statistic of telling you that it will do 135watts with a 1khz test tone... that's the equivalent of asking a strong man to pick up a tooth pick.

I really think manufactures need be truthful about what they are selling. Rate your product "All channels driven into a 8,6,4 ohm load with a full 20hz-20khz and then rate the distortion.

This stuff makes me angry as you can tell ;-)

Sorry guys.... back to talking about PSB Speakers!
Have you guys seen this new review on the Imagine mini speakers?
post #3581 of 5482
Quote:
Originally Posted by firebook23 View Post

I would say the exact opposite (with all respect) Using the above example:

105 watts is a per channel ratting... who listens to one speaker at a time on a 7 channel amp. So the maximum this amp will give if your watching a 7.1 movie is 15 watts a channel and that's only if your speakers are 8 ohms.

Now if your speakers are 6 ohms or below they give you the helpful statistic of telling you that it will do 135watts with a 1khz test tone... that's the equivalent of asking a strong man to pick up a tooth pick.

I really think manufactures need be truthful about what they are selling. Rate your product "All channels driven into a 8,6,4 ohm load with a full 20hz-20khz and then rate the distortion.

This stuff makes me angry as you can tell ;-)

Sorry guys.... back to talking about PSB Speakers!
Have you guys seen this new review on the Imagine mini speakers?

This article from Audioholics goes a long way towards mitigating concerns on this issue of "all channels driven".

I posted this elsewhere where a similar discussion was taking place:

It is also worth noting that there is a split in marketing strategies among brands that can further muddy the waters.

It is true that many receivers are rated at 2 channels output for their "100 watt" ratings and are, in five or seven channel modes, putting out far less power when driven simultaneously into clipping. Those brands choose to market from the "per channel" perspective and it makes them "look bad" in some eyes when their all channels driven numbers are significant lower.

On the other hand, some brands advertise their all channels driven number and then claim it is a conservative estimate--and it is, for TWO channel performance. But all they've really done is start from ACD and let reviewers "discover" a much greater output for two channels, while the other brands, as above, do the reverse.

The upshot is Brand A (my first example) is looked at as "deceptive" while Brand B is looked at as "exceeding expectations". In reality, they are simply spinning very similar numbers in different ways.

This is not to say that some brands don't do better than others at ACD levels--clearly that can be seen in a variety of tests and reviews. But there are two things to consider. One, can the difference between, say, 60 watts and 80 watts, before clipping, at ACD be heard. Highly unlikely. Two, are all channels EVER called upon to full power simultaneously in real world scenarios. Even less likely. For those two reasons, some brands choose to employ some sort of protection system which limits MCH output to a degree that ensures the device will probably never overload but sufficiently high to provide the necessarily performance in real world situations. Other brands do not employ such protection systems (or let them go higher before kicking in).

In some situations (power-hungry speakers and truly large rooms come to mind), more power is definitely better. But in the bulk of applications, it will not likely be noticed.

I've just recently purchased an AVR--Yamaha RX-A1000--(moved my old one to the living room where it is now doing 2 channel duty with a new pair of speakers--PSB Imagine B ). It has such a protection system that limits MCH output more than an Onkyo (a brand I have no issues with as my old AVR is an Integra DTR 6.4, still works great but no HDMI for the home cinema called for an upgrade). I chose the Yamaha for a variety of reasons over an Onkyo (great price from my dealer, 4 year warranty--in Canada, feature set that I liked, already have an Anti-mode 8033 sub EQ) but ACD power was lower on my list of concerns because of the two points I made above. If I had a larger room or different speakers, I might well have gone with an Onkyo for its more powerful amps at the same price point, but my situation did not call for it.

My overall point, though, is that I consider both types of brands (those who market "per channel" based on 2 channels driven and those who market based on ACD) engage in, to be charitable, less than clear marketing. But I find no more impressive a brand who advertises a "conservative" power rating based on ACD and proves it is more powerful in 2 channel than a brand who does the opposite but has the same overall numbers. What I do find less than impressive are those brands who focus on the 1khz output rather than 20-20000hz output. That is far more distorting of reality.

Okay, enough digression.

As for that review, I'd read it and it largely concurs with my experience with my Imagine Bs (though I do get more bass extension than the Minis).
post #3582 of 5482
Yes, this stuff makes me angry too; the ratings game is reminiscent of what was happening in the early 1960s with stereo amps before the FTC started requiring a standard power test (but which only applies to 2 channels...lol).

Actually, with the typical 7-channel amplifier in most receivers that cost under $1000 (and some that cost more) the power supply has a capability of around 400 watts. That allows the front 2 channels to be rated at 80-110 watts per channel, but when all seven channels are driven, the available power from the amplifiers (limited by the power supply) typically is about 40-50 watts per channel.

A good (or awful...lol) example of this is the Anthem MRX700 receiver, which sells for $2000 and only delivers 43 watts per channel with all seven channels driven at 0.1 % distortion (published test results in Home Theater Magazine). I'll bet that 90% of the people who buy that thing expect that they will be getting some great performance for $2000! Sorry, folks, you have been mercilessly ripped off by Anthem...rofl. Your $2000 receiver performs just like the typical $400 receiver.

If you want some honesty in ratings, and some real high audio quality, compare that Anthem piece of crap with the Cambridge Audio 650R. It advertises 100 watts per channel WITH ALL SEVEN CHANNELS DRIVEN and has a 1400-watt power supply!!! It is $1599.

No other receiver I know of even comes close to matching those specs. The sound quality with this receiver blows all the others away. Don't take my word for it; read the Home Theater Magazine review of it.

It even is set up so that if you are running 5 channels you can bi-amp the front 2 and have 220 watts per channel on the front 2 and 100 watts for the other 3 channels.

Oh, by the way; I have the Image T6 speakers and love them.




Quote:
Originally Posted by firebook23 View Post

I would say the exact opposite (with all respect) Using the above example:

105 watts is a per channel ratting... who listens to one speaker at a time on a 7 channel amp. So the maximum this amp will give if your watching a 7.1 movie is 15 watts a channel and that's only if your speakers are 8 ohms.

Now if your speakers are 6 ohms or below they give you the helpful statistic of telling you that it will do 135watts with a 1khz test tone... that's the equivalent of asking a strong man to pick up a tooth pick.

I really think manufactures need be truthful about what they are selling. Rate your product "All channels driven into a 8,6,4 ohm load with a full 20hz-20khz and then rate the distortion.

This stuff makes me angry as you can tell ;-)

Sorry guys.... back to talking about PSB Speakers!
Have you guys seen this new review on the Imagine mini speakers?
post #3583 of 5482
Thread Starter 
@commsysman

I have T6's as well love em. but they are in storage while my new house is being built. I miss my babies!

-k
post #3584 of 5482
Quote:
Originally Posted by Ovation View Post

This article from Audioholics goes a long way towards mitigating concerns on this issue of "all channels driven".

I posted this elsewhere where a similar discussion was taking place:

It is also worth noting that there is a split in marketing strategies among brands that can further muddy the waters.

I know we're getting deeply off topic here but you've raised some interesting points in your post. I have an older Parasound HCA 1205A amplifier and you piqued my interest to the point of going back and re-familiarizing myself with reported specs for this amp. Directly copied from the Parasound site, they are as follows;

John Curl brings his talents to home theater with this remarkable five channel amplifier. The results are extraordinary. Dialog is crisp. Explosions are magnificent. Exceeds stringent Home THX Ultra guidelines -- your assurance that your movies are the experience the director intended. Conservatively rated at a continuous 140 watts and 45 amps peak current on each channel.

FEATURES

Circuitry designed by John Curl
THX Ultra-certified
Direct Coupled -- no capacitors or inductors in signal path
DC Servo and relay protection circuits
High bias Class A/AB operation
1.6 kVA Toroid power transformer with independent secondary windings for each channel, 100,000 µF power supply filter capacitance
Independent power supplies for each channel
Input stages use hand matched complementary JFETs
30 beta-matched 15 amp, 50 MHz bipolar output transistor
AC present, standby/normal, current overload indicators
Rear mounted gain controls and rear handles
12 volt DC automatic turn-on circuitry; ground lift switch
Tiffany-style RCA input jacks
Gold-plated 5 way speaker binding posts
Custom designed removable IEC AC cord
3 rack space height front panel
Rack mounting adapter available
SPECIFICATIONS

Continuous Power Output - Each Channel:
140 watts RMS x 5, 20 Hz - 20 kHz, 8 Ω;
200 watts RMS x 5, 20 Hz - 20 kHz, 4 Ω
Current Capacity:
45 amperes peak per channel
Slew Rate:
130 V/µsecond
Power Bandwith:
5 Hz - 100 kHz, +0/-3 dB at 1 watt
Total Harmonic Distortion:
< 0.03 % at full power; < 0.01 % typical levels
IM Distortion:
< 0.03 %
TIM:
unmeasurable
Dynamic Headroom:
> 1.5 dB
Interchannel Crosstalk:
> 80 dB at 1 kHz
> 60 dB at 20 kHz
Input Impedance:
33 k Ω
Input Sensitivity:
1 V for 28.28 V, THX Reference Level; 1.2 V for full output
S/N Ratio:
> 117 dB, full power; > 96 dB, THX Reference Level
Damping Factor:
> 800 at 20 Hz Power Consumption: 1500 watts
Dimensions:
w 17 1/4" x h 5 1/4" x d 19", h 6" with feet
Net Weight:
46 lb.



As you can see this amp is rated at;

Continuous Power Output - Each Channel:
140 watts RMS x 5, 20 Hz - 20 kHz, 8 Ω;
200 watts RMS x 5, 20 Hz - 20 kHz, 4 Ω

If you look at the "Current Capacity" it's rated at 45 amperes peak per channel.
It also states that;

Total Harmonic Distortion:
< 0.03 % at full power; < 0.01 % typical levels

So I guess my question coming from a VERY naive standpoint is, are these numbers actually possible?

OK, back on topic........ I'm still looking for a Stratus C6 center to mate up with my Stratus Silver mains. Surely someone out there has one just laying around looking for a new home.
post #3585 of 5482
Hi all
I am new to this, so please forgive me if I do something wrong. I need some help in making up my mind with my recent PSB addition. I got a pair of older PSB Image B2 speakers in good shape for only $40 as a partial trade for other AV gear. After about a week of listening one of the woofers stopped working. Not too sure what happened as I was not playing them too loud, I my opinion anyway. I searched the net for aftermarket replacement driver, but no luck. I have PSB Canadian headquarters just 20 minute drive from where I live. They have a newer driver that matches B2 and they sell it for about $120. My question is - is it worth it? Also if I replace one driver, should I replace the one in opposite speaker as well? Or should I simply sell the speakers as is for parts or DIY? The speakers are in good shape, cabinets are clean, the grills look new, I think the previous owner had them stored. I would really appreciate your input
post #3586 of 5482
Thread Starter 
@russkie95

Do you mean Image 2B's?

I would say that 150$ is a little high as You could get a used pair on kijiji for that. but then again replacing them with new Image speakers would be in the 500$ range. It all depends on if you love them and don't want to see them die.

That speaker is a few years old but I would not bother replacing both drivers. it will make little difference.
post #3587 of 5482
Thread Starter 
Quote:
Originally Posted by Torqdog View Post


OK, back on topic........ I'm still looking for a Stratus C6 center to mate up with my Stratus Silver mains. Surely someone out there has one just laying around looking for a new home.

I have a friend with one of those centers ill ask if he wants to sell it.
post #3588 of 5482
Quote:
Originally Posted by firebook23 View Post

I have a friend with one of those centers ill ask if he wants to sell it.

That would be awesome. PM me and let me know! Thanks.
post #3589 of 5482
Quote:
Originally Posted by russkie95 View Post

Or should I simply sell the speakers as is for parts or DIY? The speakers are in good shape, cabinets are clean, the grills look new, I think the previous owner had them stored. I would really appreciate your input

See if you can find a place that repears speakers and see how much it will cost to fix. It may be a cheap fix.
post #3590 of 5482
firebrook and kiwi - thanks a lot for your input. This is my second try with PSB, first was 2 years ago when I bought brand new Image C40 centre for my HT. I was amazed with detail, completely blew my Polk centr I thought was decent. But the tweeter went in a week, I feel maybe I am jinxed with PSB :-))
post #3591 of 5482
Quote:
Originally Posted by commsysman View Post

Yes, this stuff makes me angry too; the ratings game is reminiscent of what was happening in the early 1960s with stereo amps before the FTC started requiring a standard power test (but which only applies to 2 channels...lol).

Actually, with the typical 7-channel amplifier in most receivers that cost under $1000 (and some that cost more) the power supply has a capability of around 400 watts. That allows the front 2 channels to be rated at 80-110 watts per channel, but when all seven channels are driven, the available power from the amplifiers (limited by the power supply) typically is about 40-50 watts per channel.

A good (or awful...lol) example of this is the Anthem MRX700 receiver, which sells for $2000 and only delivers 43 watts per channel with all seven channels driven at 0.1 % distortion (published test results in Home Theater Magazine). I'll bet that 90% of the people who buy that thing expect that they will be getting some great performance for $2000! Sorry, folks, you have been mercilessly ripped off by Anthem...rofl. Your $2000 receiver performs just like the typical $400 receiver.

If you want some honesty in ratings, and some real high audio quality, compare that Anthem piece of crap with the Cambridge Audio 650R. It advertises 100 watts per channel WITH ALL SEVEN CHANNELS DRIVEN and has a 1400-watt power supply!!! It is $1599.

No other receiver I know of even comes close to matching those specs. The sound quality with this receiver blows all the others away. Don't take my word for it; read the Home Theater Magazine review of it.

It even is set up so that if you are running 5 channels you can bi-amp the front 2 and have 220 watts per channel on the front 2 and 100 watts for the other 3 channels.

Oh, by the way; I have the Image T6 speakers and love them.

The higher end pioneer elite receivers have pretty honest ratings as well. The SC-37 is measured at 125 watter at 0.1 % distortion with 7 channels driven (one of the higheset the mag has measured) and got excellent subjective reviews by them as well.

I think amazon has it for $1299 last I checked.

I was surpised to see the Antehm with specs those low -- not that this is the right forum, but I wonder if anyone has it with low sensitivity speakers.
post #3592 of 5482
hello fellow psb owners ,

i have an Image B6,C5,S5 5.1 setup for HT.

Now for my Stereo setup in the bedroom, i've decided to buy a pair of Synchrony Bookshelves. But i'm very confused between the 1B and 2B. I'll give out the exact description of my listening scenario so you may give me advice as to which of these will suit my conditions better.

1. It'll be on a desktop besides my PC Screen so you can say it'll be a near field listening environment.
2. I'll be adding a sub-woofer since i enjoy bass. Not a lot of crazy bass but i like the enjoy the low frequencies whenever it's there in the music.
3. I plan to power it with a NAD C375BEE.
4. Room size in L X B X H = 12ft x 12 ft x 9ft
5. Music Genres = Rock, Pop, House, Techo.

So which of these two bookshelves would you recommended for my scenario ?
post #3593 of 5482
Quote:
Originally Posted by rana_kirti View Post

hello fellow psb owners ,

i have an Image B6,C5,S5 5.1 setup for HT.

Now for my Stereo setup in the bedroom, i've decided to buy a pair of Synchrony Bookshelves. But i'm very confused between the 1B and 2B. I'll give out the exact description of my listening scenario so you may give me advice as to which of these will suit my conditions better.

1. It'll be on a desktop besides my PC Screen so you can say it'll be a near field listening environment.
2. I'll be adding a sub-woofer since i enjoy bass. Not a lot of crazy bass but i like the enjoy the low frequencies whenever it's there in the music.
3. I plan to power it with a NAD C375BEE.
4. Room size in L X B X H = 12ft x 12 ft x 9ft
5. Music Genres = Rock, Pop, House, Techo.

So which of these two bookshelves would you recommended for my scenario ?

If it possible, compare the two and, if you can afford it, buy the better one. I am quite happy with my Imagine Bs, so I suspect i'd love a pair of Synchrony speakers.
post #3594 of 5482
Hi,

I just purchased the Image HT-2 Kit with 4 B4's, C4 and SubSeries 1 sub along with Denon AVR-1712 for my 12x12 HT room. What LFE/Bass and Crossover settings should I set on my Denon?

Thanks in advance.
post #3595 of 5482
Quote:
Originally Posted by firebook23 View Post

This stuff makes me angry as you can tell ;-)

LOL, that is why I love mono blocks with there own dedicated power circuit to the electrical panel !
post #3596 of 5482
Quote:
Originally Posted by treker747 View Post

Hi,

I just purchased the Image HT-2 Kit with 4 B4's, C4 and SubSeries 1 sub along with Denon AVR-1712 for my 12x12 HT room. What LFE/Bass and Crossover settings should I set on my Denon?

Thanks in advance.

1. Run the Audyssey calibration.
2. Observe what crossovers are selected by the calibration.
3. If, by chance, any speakers are set to "large", change them to "small".
4. If the crossovers are set lower than 80 Hz, consider raising them to 80 Hz (optional, but recommended). If the crossovers are set higher than 80 Hz, leave them alone (do not lower them).
5. The sub's LFE setting should be 120 Hz.
6. Enjoy.
post #3597 of 5482
Quote:
Originally Posted by AustinJerry View Post

1. Run the Audyssey calibration.
2. Observe what crossovers are selected by the calibration.
3. If, by chance, any speakers are set to "large", change them to "small".
4. If the crossovers are set lower than 80 Hz, consider raising them to 80 Hz (optional, but recommended). If the crossovers are set higher than 80 Hz, leave them alone (do not lower them).
5. The sub's LFE setting should be 120 Hz.
6. Enjoy.

Thanks Austin Will follow these guidelines to the letter and post the results here.
post #3598 of 5482
I'm looking at upgrading from my NHT VT-1.2 set up to maybe to PSB T6,C5 and B5. Also what avr are you guys using.
post #3599 of 5482
Question for PSB Image tower owners, particularly T6 / T-6 : Has anyone experimented with plugging the front ports for bass tuning?

I think the Imagines come with plugs to tune their rear ports, and the B&W 683 comes with foam inserts for their front ports.

I've demo'd the T6's and one of my concerns is the potential of boomy bass My room is 18 ft wide and 12 ft deep, so my listening position is only about 10 ft from the speakers and 1 or 2 ft from the back wall and I like the concept of being able to manage the bass without e.q.

My other issue is whether or not the T6's flat freq response will present itself as upper midrange harshness.

The 683 is not harsh, but may be erring in the other direction (ie. too reserved in that range).

thanks!!
- Markoz
post #3600 of 5482
Quote:
Originally Posted by jmarkoz View Post

I like the concept of being able to manage the bass without e.q.

The first step to managing bass without EQ is to measure the response you currently have. Do you have any of the tools to measure response (REW, OmniMic)? Without measurements, it's like groping in the dark. Once you know what the issues are, you can experiment with speaker placement, which is the most effective way to smooth bass response. Once the placement is as good as you can get, the next step is EQ (e.g. Audyssey), despite what you think.

As for plugging the ports, I have experimented with port plugs on my Synchrony One's, and the effect is minimal (as measured by REW). Certainly not effective in addressing any serious bass issues.
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