Official Power Sound Audio Subwoofer Thread - Page 196 - AVS Forum | Home Theater Discussions And Reviews
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post #5851 of 37582 Old 09-22-2013, 07:13 AM
 
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Originally Posted by basshead81 View Post

Good point Bee! However I believe you must double displacement to gain 3db. You do not gain 3db each time you add another sub.

You may be missing that I'm posting about the addition of an additional driver of equal capability as opposed to a separate subwoofer. My source is an excursion calculator who's calculations apply to sealed cabinets.

Hopefully I won't be banned by the "triumvir" from using the layperson's variant of "mutual coupling;" co-location. wink.gif

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post #5852 of 37582 Old 09-22-2013, 07:20 AM
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Originally Posted by BeeMan458 View Post

You may be missing that I'm posting about the addition of an additional driver of equal capability as opposed to a separate subwoofer. My source is an excursion calculator which applies to sealed cabinets.

Exactly you have to double displacement with drivers that are equal capability. When you go from 2 to 3 drivers of equal capability its 1.5 db gain. depending on much power is applied will determine the gains on top of that. So if you go from 2 driver with 1000watts to 3 drivers with 1500 watts then yes you will gain 3db.
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post #5853 of 37582 Old 09-22-2013, 07:28 AM
 
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Originally Posted by basshead81 View Post

Exactly you have to double displacement with drivers that are equal capability. When you go from 2 to 3 drivers of equal capability its 1.5 db gain. depending on much power is applied will determine the gains on top of that. So if you go from 2 driver with 1000watts to 3 drivers with 1500 watts then yes you will gain 3db.

I do try. smile.gif If you reread my comments you'll see I was doing my best to literarily mime your above when I referred to drivers and equal Xmax.

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post #5854 of 37582 Old 09-22-2013, 08:07 AM
 
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Originally Posted by basshead81 View Post

I believe you must double displacement to gain 3db.
Doubling displacement gets 6dB. That means doubling the speaker/driver count, while maintaining constant voltage swing. Since a doubling of cab count parallel wired halves the impedance load maintaining constant voltage swing into that load also doubles power.
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post #5855 of 37582 Old 09-22-2013, 08:33 AM
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Originally Posted by Bill Fitzmaurice View Post

Doubling displacement gets 6dB. That means doubling the speaker/driver count, while maintaining constant voltage swing. Since a doubling of cab count parallel wired halves the impedance load maintaining constant voltage swing into that load also doubles power.

Agreed.
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post #5856 of 37582 Old 09-22-2013, 11:17 AM
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.....................................

Thanks
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post #5857 of 37582 Old 09-22-2013, 11:18 AM
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Congrats! Let us know how you like it. smile.gif

Thanks I will.
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post #5858 of 37582 Old 09-22-2013, 11:19 AM
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Originally Posted by ggsantafe View Post

Welcome to the club - I added an XS30 to my system a few months ago - I expect you will be quite pleased with the results once you install your XS30 - let us know how it sounds....

Thanks, can't wait.
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post #5859 of 37582 Old 09-22-2013, 11:21 AM
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Originally Posted by cr136124 View Post

Pretty cool...........congrats!

I purchased my XS30 almost two months ago and I'm totally satisfied with this subwoofer..........there is only one problem and it's called:


Warning: Spoiler! (Click to show)
Triax..............tongue.gif



Jokes aside, the XS30 is a really impressive sub, I ordered mine with the Cordovan Cherry finish, the look is incredible as the sound. It helped me to achieve a new level at the mid and upper bass in my system. I'm positive you will be happy with this addition to your system.

Once again congrats!

Thanks, I think the triax will be killer.
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post #5860 of 37582 Old 09-23-2013, 08:07 AM
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Can someone please do a "walkaround" video and quick review of ANY PSA sub? There's nothing out there! I think many would like to see that. Thanks in advance.
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post #5861 of 37582 Old 09-23-2013, 08:44 AM
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Originally Posted by SXRDISBEST View Post

Can someone please do a "walkaround" video and quick review of ANY PSA sub? There's nothing out there! I think many would like to see that. Thanks in advance.

click on the thread pictures...plenty of footage there.
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post #5862 of 37582 Old 09-23-2013, 02:44 PM
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Well, R&L just picked up the XV30F about 30 mins ago. Thinking about hooking up the 2 RW-12Ds I still have from previously but I just know I'll be disappointed biggrin.gif

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post #5863 of 37582 Old 09-23-2013, 03:49 PM
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Been putting off loading up my two xv30f s since yesterday. Gotta get it done today though. Uggg...
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post #5864 of 37582 Old 09-23-2013, 04:08 PM
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Does these subs come with a remote?
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post #5865 of 37582 Old 09-23-2013, 04:12 PM
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Originally Posted by booga24 View Post

Does these subs come with a remote?

No, what would you need a remote for?

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post #5866 of 37582 Old 09-23-2013, 04:12 PM
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Originally Posted by booga24 View Post

Does these subs come with a remote?


nope....just alot of horsepower.
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post #5867 of 37582 Old 09-23-2013, 04:33 PM
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No, what would you need a remote for?





Just thought of it because of cons of another sub on Audioholics smile.gif.


Big and heavy – not easily moved by a single person (123 pounds)
Cheap Volume Control on Amplifier (No detents or easily repeatable settings)
No remote control
Plastic 5-way binding posts give amplifier a cheap appearance
Relatively low RMS power output capabilities (350 Watt “Continuous”) limits low frequency extension
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post #5868 of 37582 Old 09-23-2013, 05:43 PM
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Remotes are not needed. You can adjust the volume/gain on you receiver if you would like.

I can think of why that would be a con for any sub. Just something else to lose!

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post #5869 of 37582 Old 09-23-2013, 07:45 PM
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Originally Posted by pdxrealtor View Post

Been putting off loading up my two xv30f s since yesterday. Gotta get it done today though. Uggg...

If I didn’t have so much on my platter I would be glad to help you out neighbor.. FTBS! tongue.gifbiggrin.gif

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post #5870 of 37582 Old 09-23-2013, 07:47 PM
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Thanks for the offer! Appreciate that.

You just wanna see my six SI 18s ....... don't lie. tongue.gif
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post #5871 of 37582 Old 09-23-2013, 08:02 PM
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Originally Posted by pdxrealtor View Post

Thanks for the offer! Appreciate that.

You just wanna see my six SI 18s ....... don't lie. tongue.gif


Hopefully those 6 si 18's do the job. smile.gif
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post #5872 of 37582 Old 09-23-2013, 08:03 PM
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Originally Posted by pdxrealtor View Post

Thanks for the offer! Appreciate that.

You just wanna see my six SI 18s ....... don't lie. tongue.gif

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post #5873 of 37582 Old 09-23-2013, 10:01 PM
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post #5874 of 37582 Old 09-23-2013, 11:00 PM
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post #5875 of 37582 Old 09-24-2013, 01:43 AM
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Originally Posted by jarretc View Post

I think it was good for movies, but it didn't have enough bass for the type of music I listen to ( EDM - techno,trance,dance,house,etc. ) so I'm hoping that the Triax will have enough. The XV30F was close to getting the pressurization that I'm looking for but it just didn't have enough power. Tom said that the Triax should supply 2-2.5 times the amount of bass though so I may be happy with that or I may still want more....we will see biggrin.gif

If you don't mind me asking, what gain level were you running at? That's the kind of music (my wife will argue this) that I like and sometimes I don't feel like I get the most oomph possible from the pair of XV30s I use. If I have them tuned to where they sound good on movies, the audio part lacks a little. Course my listening area leaves much to be desired. Placement is crap with sitting in a null, not about to corner load, not much boundary effects to speak of with a thin wall, carpet thick pad over concrete slab and a very large 5-6k cu/ft area to pressurize.

Even with all that, I've found that there's joy to be had if you crank the gain past 2 to 3 pm and then they'll really start pumping.

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post #5876 of 37582 Old 09-24-2013, 07:03 AM
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Originally Posted by stm69 View Post

If you don't mind me asking, what gain level were you running at? That's the kind of music (my wife will argue this) that I like and sometimes I don't feel like I get the most oomph possible from the pair of XV30s I use. If I have them tuned to where they sound good on movies, the audio part lacks a little. Course my listening area leaves much to be desired. Placement is crap with sitting in a null, not about to corner load, not much boundary effects to speak of with a thin wall, carpet thick pad over concrete slab and a very large 5-6k cu/ft area to pressurize.

Even with all that, I've found that there's joy to be had if you crank the gain past 2 to 3 pm and then they'll really start pumping.

I've been non-stop fiddling with my XV30f for weeks (no measuring equipment/EQ other than Audyssey XT) and this past weekend I finally hit the jackpot. I was having to run it 11+db hot in my 8k cubic ft. listening space to get decent bass. No matter where I placed it or how I turned it, as soon as I ran Audyssey it would suck the life out of the sub. I guess I just don't like "flat" bass?

I was coming from a VTF3.4 that allowed me to run Audyssey then tweak the sub after the fact from eq1 and 1 port open to eq2 with 2 ports open. I've been wracking my brain trying to duplicate this with the XV in some way outside of just cranking the amp on the sub (which didn't correct the "sound" issue) and I admit I was resistant to spending more money on measuring equipment and a miniDSP.

I finally found that if I put the sub in a corner, turned it to fire at the main LP then ran Audyssey... I could then turn it to face the wall afterwards and it not only blended better but I was able to turn the gain down to only run around +3 to 4db hot. If I turned it facing the wall first then ran Audyssey..I had to crank the gain to get some bass back and it didn't sound as good.

I know its not scientific..but it worked biggrin.gif

*updated to add that I went ahead and ordered the miniDSP+ SPL meter because curiosity got the better of me and I want to know WHY I like the sound better after this weekend.
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post #5877 of 37582 Old 09-24-2013, 08:51 AM
 
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Placement is crap with sitting in a null, not about to corner load, not much boundary effects to speak of with a thin wall, carpet thick pad over concrete slab and a very large 5-6k cu/ft area to pressurize.

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I was having to run it 11+db hot in my 8k cubic ft. listening space to get decent bass. No matter where I placed it or how I turned it, as soon as I ran Audyssey it would suck the life out of the sub. I guess I just don't like "flat" bass?

It seems to be some sort of unwritten, "Murphy's Acoustical Law", that the deepest null will take place at the MLP and without room measuring capability, there's zero hope of getting the best out of one's subwoofer system. That being said, I've also found, a room doesn't come alive until a third subwoofer is added to the subwoofer system.

With all the above in mind.......good-luck! tongue.gif
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post #5878 of 37582 Old 09-24-2013, 11:27 AM
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I'm all for a 3rd sub (or even a 2nd)..but not sure my wife agrees with me smile.gif

I've requested that our next house have a basement and after what I've done to our living room she is on board 100%.

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post #5879 of 37582 Old 09-24-2013, 11:31 AM
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Originally Posted by stm69 View Post

If you don't mind me asking, what gain level were you running at? That's the kind of music (my wife will argue this) that I like and sometimes I don't feel like I get the most oomph possible from the pair of XV30s I use. If I have them tuned to where they sound good on movies, the audio part lacks a little. Course my listening area leaves much to be desired. Placement is crap with sitting in a null, not about to corner load, not much boundary effects to speak of with a thin wall, carpet thick pad over concrete slab and a very large 5-6k cu/ft area to pressurize.

Even with all that, I've found that there's joy to be had if you crank the gain past 2 to 3 pm and then they'll really start pumping.

I don't mind at all, I was running between 2 and 3 o'clock but don't have a picture of the exact setting. I never turned it up past that because the manual said not to and I'd rather caution on the side of error when messing around with a $1400 piece of equipment that I'm not familiar with biggrin.gif

I also have a large area to work with being over 8,000 cubic feet.

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post #5880 of 37582 Old 09-24-2013, 11:33 AM
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Originally Posted by BeeMan458 View Post


It seems to be some sort of unwritten, "Murphy's Acoustical Law", that the deepest null will take place at the MLP and without room measuring capability, there's zero hope of getting the best out of one's subwoofer system. That being said, I've also found, a room doesn't come alive until a third subwoofer is added to the subwoofer system.

With all the above in mind.......good-luck! tongue.gif

Well guess I better just cancel my Triax order since I'm not going with 3 and I won't be happy with it rolleyes.gif

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