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post #1 of 30 Old 05-21-2012, 10:08 PM - Thread Starter
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I just finished bulding one of my Dayton 15 "HF's,20x 25 X25 sealed w Oaudio 500w amp. I hooked it up and my impression was well...........not good. The subwoofer does not sound all that great. I dont hear that "tight" sound when I listen to music. I put a movie in and the bass could not be herd much. My towers were putting out a little less bass. I put the gain all the way full ( which I know I shouldn't do) and the sound was not loud at all. I actually got a popping sound out the subwoofer louder than the subwoofer its self. I can see the driver moving alot but I cant hear or feel the bass much. I must mention though that I have not done any polyfill.


Settings-
X over-80z
gain- 1/4th (can barely hear the subwoofer w my yammy at -15)
Phase-0

(parametric eq)
Q- set to low
2nd knob-0db
3rd knob-25hz

Av- subwoofer set 4db higher than the rest of the speakers.




HELP!

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post #2 of 30 Old 05-21-2012, 10:14 PM
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What's the amp, how is the rest of your system configured(crossover settings, gain settings for sub vs mains, ran audyssey)? Is the box sealed up tight?
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post #3 of 30 Old 05-21-2012, 10:23 PM
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which dayton hf?

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post #4 of 30 Old 05-21-2012, 10:25 PM - Thread Starter
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Quote:
Originally Posted by Jay1 View Post

What's the amp, how is the rest of your system configured(crossover settings, gain settings for sub vs mains, ran audyssey)? Is the box sealed up tight?

just made an edit.

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post #5 of 30 Old 05-21-2012, 10:25 PM - Thread Starter
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Quote:
Originally Posted by ltd02 View Post

which dayton hf?

15"

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post #6 of 30 Old 05-21-2012, 10:31 PM
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Did you put gasket foam on the driver before installing it? If the box is sealed up good, you might have either a bad amp or driver.
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post #7 of 30 Old 05-21-2012, 10:38 PM - Thread Starter
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Quote:
Originally Posted by Jay1 View Post

Did you put gasket foam on the driver before installing it? If the box is sealed up good, you might have either a bad amp or driver.

Subwoofer has gasket foam, box has been double checked.

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post #8 of 30 Old 05-22-2012, 12:01 AM
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Contact PE and O Audio
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post #9 of 30 Old 05-22-2012, 01:27 AM
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The enclosure is a little large for the amount of power you have (500w). You can set the subsonic filter to 25hz and cone excursion should be ok. Any lower and you could bottom out the driver if you play too loud.

Hard to say what your problem is exactly... Maybe your expectations were high or you have a pretty bad frequency response. How does the subwoofer sound if you sit right next to it? Should be pretty loud, at least 105db.
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post #10 of 30 Old 05-22-2012, 05:48 AM
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Quote:
Originally Posted by Mrkazador View Post

Hard to say what your problem is exactly... Maybe your expectations were high or you have a pretty bad frequency response. How does the subwoofer sound if you sit right next to it? Should be pretty loud, at least 105db.

I agree with this. How big is your room and how far away from the sub are you sitting? My 250W store bought sub sitting 4 feet from me was louder in my 11x14 room than my 2 EP4000 powered DIY 12s sitting 12 feet from me in a 11x36 room. The room change and further away listening position had a large impact on SPL.
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post #11 of 30 Old 05-22-2012, 06:17 AM
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Have you moved the sub around the room to different locations?
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post #12 of 30 Old 05-22-2012, 06:26 AM
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Are you running your mains LARGE? Setting to small should send more content to sub.....

Check phase.

What are you comparing it to?

Corner load maybe for more spl but response may suffer.
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post #13 of 30 Old 05-22-2012, 07:34 AM
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Where are you located? Might be near enough to someone for a second opinion.

 

Originally Posted by Bill Fitzmaurice:
It's also the very sort of Voodoo Engineering that should never be done.

 

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post #14 of 30 Old 05-22-2012, 07:52 AM - Thread Starter
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Quote:
Originally Posted by WiSounds View Post

Where are you located? Might be near enough to someone for a second opinion.

I am located in McAllen, Tx

Phase is set to 0.
The amp should be working because the "pop" noise is the subwoofer bottoming out.

The subwoofer seems to be moving a whole lot but i can get infront of it and theres not that much spl comming out from it.

Could it be that I have not added any polyfill?

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post #15 of 30 Old 05-22-2012, 08:15 AM
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Quote:
Originally Posted by deathinc View Post

I am located in McAllen, Tx

Phase is set to 0.
The amp should be working because the "pop" noise is the subwoofer bottoming out.

The subwoofer seems to be moving a whole lot but i can get infront of it and theres not that much spl comming out from it.

Could it be that I have not added any polyfill?

I do not think it is the lack of polyfill that is the problem.

Do you have an spl meter? Do you have a smart phone? There are free spl meter apps for phones these days and are better than nothing.

Phase set 0 really is meaningless in determining if your phase is set correctly. Which AVR are you using? Does it have room correction?

How does the sub sound alone? Without the mains playing?

Even properly integrated your not going to get earth shattering bass out of a single sealed HF in most moderately sized rooms.

How big is this room?
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post #16 of 30 Old 05-22-2012, 08:30 AM
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Have you reversed polarity on the driver to see if that makes a difference?
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post #17 of 30 Old 05-22-2012, 10:55 AM
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A single sealed 15" isn't going to be jaw dropping impressive, but you should still be able to hear it when your face is right by it.

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post #18 of 30 Old 05-22-2012, 11:28 AM
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With that O Audio 25hz filter, OP should have a 1db elevated response down to 30hz, and an f3 of 24hz anechoic. This will put him at over 110db at 30hz, and also puts him at 20 mm xmax.

It's possible the driver was damaged. That amp has to be used carefully, because all of the HPF's have boost applied.
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post #19 of 30 Old 05-22-2012, 11:56 AM
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Quote:
Originally Posted by moosifee View Post

Have you reversed polarity on the driver to see if that makes a difference?

I wondered the same thing. Especially the part where you mentioned that your towers were producing less bass with the sub on.
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post #20 of 30 Old 05-22-2012, 12:08 PM - Thread Starter
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Quote:
Originally Posted by NicksHitachi View Post

I do not think it is the lack of polyfill that is the problem.

Do you have an spl meter? Do you have a smart phone? There are free spl meter apps for phones these days and are better than nothing.

Phase set 0 really is meaningless in determining if your phase is set correctly. Which AVR are you using? Does it have room correction?

How does the sub sound alone? Without the mains playing?

Even properly integrated your not going to get earth shattering bass out of a single sealed HF in most moderately sized rooms.

How big is this room?

room is like 15x12

The towers sound louder w the subwoofer's gain set to 3/4 even at full.

av is a yamaha rx-v400 series that I'm testing it out with.

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post #21 of 30 Old 05-22-2012, 12:17 PM - Thread Starter
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Quote:
Originally Posted by sgallagan View Post

I wondered the same thing. Especially the part where you mentioned that your towers were producing less bass with the sub on.

When I put my sub and towers together , you can't tell much of a difference .

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post #22 of 30 Old 05-22-2012, 02:13 PM
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With your parametric equalizer settings, it is turned OFF ... No problem there.

The "Subsonic Filter and EQ" should be set to 25Hz, the Crossover should be "Disabled" (Letting your AVR set the proper crossover frequencies).

Try setting the "Phase" to 180 degrees.

Have fun,

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post #23 of 30 Old 05-22-2012, 02:49 PM - Thread Starter
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tried all that, nothing works . Will buy polyfill or insulation and check for more leaks if possible.

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post #24 of 30 Old 05-22-2012, 02:58 PM
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Quote:
Originally Posted by Jay1 View Post

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Yeah. Sounds like either a bad driver or a bad amp.

Are you able to dismantle the driver from the enclosure and examine it? Hopefully there are no defects but if there is one...

My Dual 18" LLT subs 120dB down to 10hz

 

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post #25 of 30 Old 05-22-2012, 08:00 PM - Thread Starter
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Quote:
Originally Posted by Scott Simonian View Post

Yeah. Sounds like either a bad driver or a bad amp.

Are you able to dismantle the driver from the enclosure and examine it? Hopefully there are no defects but if there is one...

did further inspection and I managed to find one air leak. That might be the issue, though the air leak is very very small....

How would I know if I have a bad amp or driver?

I just downloaded an spl meter in my phone and he results are in.

With the gain set to 1/2 yammy set at -8db, I get 65-98db 1 in in front of the woofer. When it goes to 98db I get a very bad and loud "pop" sound from the driver. I though that with the sub sonic filter set to 25hz it shouldn't bottom out.

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post #26 of 30 Old 05-22-2012, 08:38 PM
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Is that at the listening position?

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post #27 of 30 Old 05-22-2012, 09:37 PM
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Quote:
Originally Posted by Looneybomber View Post

Is that at the listening position?

He wrote, "1 in in front of the woofer." I assume the "1 in" stands for "1 inch."
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post #28 of 30 Old 05-22-2012, 10:35 PM
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Sounds like a bad amp to me.

My Dual 18" LLT subs 120dB down to 10hz

 

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post #29 of 30 Old 05-25-2012, 07:51 PM
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Something has to be wrong, probably the amp. What little sound you think is coming from the sub at this point could very well be excitation from the towers. (my guess)

That HF 15" sub will be very obvious when working! Even in the worst possible room placement.
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post #30 of 30 Old 05-28-2012, 10:30 PM
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Quote:
Originally Posted by deathinc View Post

How would I know if I have a bad amp or driver?

Polyfill is not the problem here. Leaks perhaps.
You should be able to feel a single 15 in a 12x15 room.

Do you have a cellphone with video capability so we can hear the popping and excursion?

Could be your room, you could try taking it outside and see if it gets louder with your ears up close.

Many of us are running 4, or 8 (or more) 18's; if you are a basshead like us maybe you are simply expecting too much out of a single 15.


Many many years ago I use to have two velodynes in a 13x12 room. You could definitely feel it.


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