JBL LSR305/308 Appreciation Thread - Page 34 - AVS Forum | Home Theater Discussions And Reviews
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post #991 of 1078 Old 07-17-2018, 12:51 AM
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Quote:
Originally Posted by m. zillch View Post
Assuming this is true of both your L and R speaker I think we can safely say it isn't because you happen to have two broken speakers. I suspect your source device isn't pumping out enough volts and you need either to switch to a higher level output device or install an in-line booster, aka a "line amp". As I mentioned before the only one I have personal experience with was for high end car stereo use so you'd need to buy a ~12V DC power source for it (a simple wall wart transformer would probably do) namely this:
https://www.ebay.com/sch/i.html?LH_C...=true&_fosrp=1

Audio Control (not to be confused with the similar sounding but only mediocre Audio Source) also makes top flight gear:
https://www.crutchfield.com/p_161OVE...rive-Plus.html
I have tried it with several inputs. I see that you used an aux out from preamp. If it is easily doable, what max SPL you would get when input from a iPhone headphone output?

Aux outs are generally at 150 mv. But the pre outs are at 2.6v.

Did you use pre out?

I only have one speaker. I was planning to buy the second one if this was acceptable.

Specs from RX V800:

Phones Output .................................................. ... 150 mV/100 ohms

• Input Sensitivity

CD, etc .................................................. ............ 150 mV/47 kohms

PHONO .................................................. ........... 2.5 mV/47 kohms

6CH INPUT .............................................. 150 mV/40 – 47 kohms

• Output Level

REC OUT .................................................. ...... 150 mV/0.9 kohms

PRE OUT .................................................. .......... 2.6 V/1.2 kohms

SUBWOOFER .................................................. .. 4.0 V/1.2 koh

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Last edited by SouthernCA; 07-17-2018 at 01:47 AM.
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post #992 of 1078 Old 07-17-2018, 02:10 AM
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Quote:
Originally Posted by SouthernCA View Post
I have tried it with several inputs. I see that you used an aux out from preamp. If it is easily doable, what max SPL you would get when input from a iPhone headphone output?

Aux outs are generally at 150 mv. But the pre outs are at 2.6v.

Did you use pre out?

I only have one speaker. I was planning to buy the second one if this was acceptable.

Specs from RX V800:

Phones Output .................................................. ... 150 mV/100 ohms

• Input Sensitivity

CD, etc .................................................. ............ 150 mV/47 kohms

PHONO .................................................. ........... 2.5 mV/47 kohms

6CH INPUT .............................................. 150 mV/40 – 47 kohms

• Output Level

REC OUT .................................................. ...... 150 mV/0.9 kohms

PRE OUT .................................................. .......... 2.6 V/1.2 kohms

SUBWOOFER .................................................. .. 4.0 V/1.2 koh

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To make it more confusing -10dBV is defined below. Which is between aux out and pre out.

The two standard line levels are:

-10 dBV for consumer equipment (0.316 V RMS) or 0.445 V amplitude.

+4 dBu for professional equipment (1.23 V RMS)





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post #993 of 1078 Old 07-17-2018, 09:54 AM
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The JBL LSR305s are on Amazons prime day sale for $90 each. Bought 2 that I plan to use as my computer speakers for music and gaming.

Rather than an audio interface for now, I purchased this cable to go from my Dragonfly Red USB to 3.5mm analog jack output to the speakers. Anyone see any issue with that? Will sound quality be drastically decreased vs using a USB audio interface?

Hosa CMP-159 3.5 mm TRS to Dual 1/4 inch TS Stereo Breakout Cable, 10 feet https://www.amazon.com/dp/B005HGM1D6..._v2CtBb5XVH7T2

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post #994 of 1078 Old 07-17-2018, 10:04 AM
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Quote:
Originally Posted by SouthernCA View Post
Did you use pre out?
Yes.

Quote:
Originally Posted by SouthernCA View Post
If it is easily doable, what max SPL you would get when input from a iPhone headphone output?
I was about to attempt a second test for you of the iphone's output but hit a stumbling block. I can't test what sort of results one would get from the output of an iphone because the SPL meter app I use, NIOSH, refuses to operate while the phone is playing a music file, sorry. The iphone can only do one or the other but not both simultaneously.

Last edited by m. zillch; 07-17-2018 at 10:24 AM.
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post #995 of 1078 Old 07-17-2018, 10:16 AM
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Originally Posted by citsur86 View Post
The JBL LSR305s are on Amazons prime day sale for $90 each. Bought 2 that I plan to use as my computer speakers for music and gaming.

Rather than an audio interface for now, I purchased this cable to go from my Dragonfly Red USB to 3.5mm analog jack output to the speakers. Anyone see any issue with that? Will sound quality be drastically decreased vs using a USB audio interface?

Hosa CMP-159 3.5 mm TRS to Dual 1/4 inch TS Stereo Breakout Cable, 10 feet https://www.amazon.com/dp/B005HGM1D6..._v2CtBb5XVH7T2
My recommendation would be to make sure your dragonfly can provide 500 mV amplitude (1v peak to peak) to drive them properly. Aux out may not be sufficient. Others are using pre outs from Yamaha (probably 2.6v amplitude or peak to oeak - not sure) to get the best out of these speakers.


But I am still researching the topic.

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Last edited by SouthernCA; 07-17-2018 at 10:23 AM.
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post #996 of 1078 Old 07-17-2018, 10:20 AM
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Quote:
Originally Posted by m. zillch View Post
Yes.

I was about to attempt a second test for you of the iphone's output but hit a stumbling block. I can't test what sort of results one would get from the output of an iphone because the SPL meter app I use, NIOSH, refuses to operate while the phone is playing a music file, sorry. The iphone can only do one or the other but not both simultaneously.
That would be fine. Just wanted to get your gut feel as to how much that volume comes down when used with iPhone out.

What volume level did you place your Yamaha to get to.the max volume. I am assuming your 305 we're set at max volume with -10dBV switch. I am again assuming that your preouts are 2.6v at max.

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post #997 of 1078 Old 07-17-2018, 10:21 AM
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Quote:
Originally Posted by SouthernCA View Post
My recommendation would be to make sure your dragonfly can provide 500 mV amplitude (1v peak to peak) to drive them properly. Aux out may not be sufficient. But I am still researching the topic.

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Not sure about the PCs (Surface Book 2) audio output card or the Surface Dock that it would be using if I was plugging that Aux into there, but I am not. I will be plugging it into a Dragonfly Red which sits in the USB slot of the PC. This DAC is also an amp and I am confident it has more than enough voltage to drive the JBLs. When I have my 16ohm B&W P7 headphones into it, I can only run it around 1/15 volume before its way too loud.


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post #998 of 1078 Old 07-17-2018, 11:19 AM
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Originally Posted by citsur86 View Post
Not sure about the PCs (Surface Book 2) audio output card or the Surface Dock that it would be using if I was plugging that Aux into there, but I am not. I will be plugging it into a Dragonfly Red which sits in the USB slot of the PC. This DAC is also an amp and I am confident it has more than enough voltage to drive the JBLs. When I have my 16ohm B&W P7 headphones into it, I can only run it around 1/15 volume before its way too loud.


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Great. Let me check Dragonfly.

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post #999 of 1078 Old 07-17-2018, 12:02 PM
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Quote:
Originally Posted by SouthernCA View Post
Great. Let me check Dragonfly.

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Looks like DragonFly Red is 2.1V RMS.

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post #1000 of 1078 Old 07-17-2018, 01:20 PM
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Quote:
Originally Posted by SouthernCA View Post
That would be fine. Just wanted to get your gut feel as to how much that volume comes down when used with iPhone out.
According to some reports the Lightning to 3.5mm jack dongle [it contains both the DAC and headphone amp] when used on the iphone 6 and 7+ at least (NOT SURE ABOUT OTHERS AND ODDLY IT SEEMS IT DOES DIFFER PER DEVICE) is .44V.

https://www.innerfidelity.com/conten...log-or-digital

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post #1001 of 1078 Old 07-17-2018, 10:50 PM
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Quote:
Originally Posted by m. zillch View Post
According to some reports the Lightning to 3.5mm jack dongle [it contains both the DAC and headphone amp] when used on the iphone 6 and 7+ at least (NOT SURE ABOUT OTHERS AND ODDLY IT SEEMS IT DOES DIFFER PER DEVICE) is .44V.

https://www.innerfidelity.com/conten...log-or-digital
Thank you so much. You are great.

As per this, iPhone with an adapter should be able to drive it to max. That is if the speaker specs are correct.

But since you are driving them with a preamp out (2.6v), they may not be.

I have tested with iPhone 10 with a dongle and I think I still get about 83 to 85 dB. Probably need oreamp out to get what you are getting.

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post #1002 of 1078 Old 07-18-2018, 12:14 AM
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You're welcome, but I would suggest you should always take manufacturer's specs, be it Apple, Yamaha, or JBL, with a grain of salt. They often contain errors and typos.

Also don't take "-10dBV" and "+4dBu" literally. [And notice they aren't even the same units!] They are just shorthand/ballpark ways of describing "low level signals found in typical consumer gear" and "stronger level signals found in more pro gear".

JBL describes the input sensitivity as "92 dB @ 1M using the -10dBV setting of the switch" but they don't state:

A. what position the rotary knob is at during the test
B. the voltage level of the incoming signal

so it is not really very meaningful.

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post #1003 of 1078 Old 07-18-2018, 12:24 AM
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Quote:
Originally Posted by SouthernCA View Post
But since you are driving them with a preamp out (2.6v),
"Pre-amp level" can mean a wide range of signals. True high end preamps can do 2.6V or more, but the pre-outs of AVRs are often weaker. I wouldn't trust Yamaha specs. Audioholics measured far less than that from the main pre-outs of my AVR.

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post #1004 of 1078 Old 07-18-2018, 10:23 AM
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Quote:
Originally Posted by m. zillch View Post
"Pre-amp level" can mean a wide range of signals. True high end preamps can do 2.6V or more, but the pre-outs of AVRs are often weaker. I wouldn't trust Yamaha specs. Audioholics measured far less than that from the main pre-outs of my AVR.
Probably true....

Do you hear any clipping (suggesting that your preamp output is more than what 305 can accept) when you max on your Yamaha?

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post #1005 of 1078 Old 07-18-2018, 10:28 AM
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May be something like this may work for me. Sorry for the compressed image.

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post #1006 of 1078 Old 07-18-2018, 11:19 AM
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Quote:
Originally Posted by SouthernCA View Post
Do you hear any clipping (suggesting that your preamp output is more than what 305 can accept) when you max on your Yamaha?
Clipping is easily masked by pink noise so I'm not sure. I could try tests with pure tones but not today. There is a giant construction project outside and even with all my windows shut there's a ton of noise here right now. Maybe tomorrow.

Also it would be hard to know if the distortion I'd be hearing was because the source device was clipping it's output or if the amps in the speaker were clipping.
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Quote:
Originally Posted by SouthernCA View Post
May be something like this may work for me.
Without any measurements of its output there's no way to tell.
---

Have you tried the headphone jack output of your AVR? Yamaha's spec sheet claiming "150mV" is an error if you ask me. It's stronger.
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post #1008 of 1078 Old 07-22-2018, 07:13 AM
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Would something like this help? Has anyone used it?


Look at this on eBay http://www.ebay.com/itm/112840559165






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post #1009 of 1078 Old 07-22-2018, 08:00 AM
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I would imagine that these should be loud enough for your purposes:
https://www.jbl.com/studio-monitors/...e&prefv2=false

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post #1010 of 1078 Old 07-22-2018, 09:11 AM
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Quote:
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Would something like this help? Has anyone used it?
It'll put out 1.6Vrms max. Haven't used it.

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post #1011 of 1078 Old 07-22-2018, 02:32 PM
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It'll put out 1.6Vrms max. Haven't used it.
That would be perfect. But how did you get to 1.6v rms?

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post #1012 of 1078 Old 07-22-2018, 03:52 PM
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Quote:
Originally Posted by SouthernCA View Post
That would be perfect. But how did you get to 1.6v rms?
http://www.fiio.net/en/products/53/parameters

Quote:
MAX Output Voltage 4.52Vp-p
4.52/2.818 ~= 1.6Vrms

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post #1013 of 1078 Old 07-22-2018, 04:28 PM
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Quote:
Originally Posted by 12B4A View Post
The gain is listed as "3.65dB". I'm thinking more than that is needed since I'm getting output levels ~10 dB higher at 1 M with pink noise than his, using my pre-outs on my AVR.
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post #1014 of 1078 Old 07-22-2018, 06:03 PM
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Since iPhones (headphone jack or lighting) can output 1Vrms, I don't know what else to point to here. Should be getting mid 90s with max volume without the volume limiter enabled (settings-->music). Just checked with my cracked 6+ and I was getting in that range with pink noise. I dunno, the needle has been skipping talking about this problem in this thread.

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post #1015 of 1078 Old 07-22-2018, 06:21 PM
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Just checked with my cracked 6+ and I was getting in that range with pink noise. I dunno, the needle has been skipping talking about this problem in this thread.
"The needle"? What/who does that mean?

UPDATE: Oh you mean the current gist of the thread?

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post #1016 of 1078 Old 07-23-2018, 08:20 AM
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Thanks.

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post #1017 of 1078 Old 08-25-2018, 10:49 AM
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For those enjoying the 305's. just saw this on Digital Trends. The 306P

https://www.digitaltrends.com/speake...p-mkii-review/
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post #1018 of 1078 Old 08-25-2018, 08:45 PM
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Cool

Nice review, thanks for posting!

I've been rocking my 308MKII's for several months now, and I can't get over how great they sound, especially at their price point. I am seriously thinking about applying some wood veneer to the top/sides/bottom to make them more attractive.

I've also owned the 4306 monitors for about 6 months and really love them alot as well. I recently moved, and for the first time in my life I have a dedicated music only room that they are in. Also for the first time, I acoustically treated the room, and the benefits are very noticable!!
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post #1019 of 1078 Old 11-26-2018, 09:44 PM
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Last month, I bought a pair of 305 MKII's on sale.

Compared with my more expensive speakers, I wasn't that impressed with them....but wait!

The really weak point on these things are the cabinets. I wasn't happy with the loose (woom, woom) muddy bass. So I bought some dowels and some non-drying clay. I opened these puppies with a simple screwdriver. I cut the dowels (I bought 2 three-foot lengths) and wedged one (top to bottom and two across the sides. I took the clay and coated the woofer metal baskets and outside of the port with a thin layer. (The port comes out easily with the 3 screws that surround it.)

What a change! The bass is so much tighter. Upright basses sound like upright basses, not just a bunch of wwwwoooooooommmmm, wwwwwoooommmm, wwwwwooooommmm in the background.

I highly recommend that anyone with a 3 series do this. (The one downside is that I'm pretty sure this voids the warranty. But I guess if you can do this, you can contact JBL and tell them what is wrong with the speaker and they would send you a replacement part and you could exchange it yourself.)
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post #1020 of 1078 Old 11-26-2018, 09:53 PM
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I have wondered if the cabinet might be a weak point. I would be curious if Charles Sprinkle put any emphasis on the cabinet in his new Kali speakers.

Having fun playing the new mobile game Volley Village
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