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Author Topic: 15" Subwoofer Build  (Read 916 times)

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firev1

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Re: 15" Subwoofer Build
« Reply #10 on: August 15, 2015, 05:15:11 PM »

I wanted to go with Dayton Ref subs but the car subs idea seems good too, would love to see your build's evaluations and how they come along.
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OJneg

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Re: 15" Subwoofer Build
« Reply #11 on: August 17, 2015, 03:10:52 AM »

Subwoofer under desk:



FR at listening position with NegMonitors:



Signal routing is a bit complex using Jriver it goes like this:

Jriver (allpass) > Hilo USB Channel 1&2 -> Line-out (6dBV) -> d1 relay attenuator -> Parasound Z-amp > NegMonitors

Jriver (JRSS 100Hz lowpass) > Hilo USB Channel 4 > Monitor-out (24dBu) > Crest CA -> NegSub

-15dB on attenuator corresponds to -40.5dB on Monitor-out attenuation for the given response. For listening I adjust each control individually. I am guilty of turning up sub on thinner recordings.

Sounds good.
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RexAeterna

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Re: 15" Subwoofer Build
« Reply #12 on: August 18, 2015, 11:47:31 PM »

A jbl 2226 15" driver would been great to experiment with. They can take crap load abuse. They're were used in theater and pro use.  I have a 4648-8a theater sub with dual 2226j 15" woofers and they can seriously take some abuse and can handle more power then they're rated for but, might not be something everyone be fond of cause the 4648 sub is heavey at 150lbs and really bulky... But, that's that cab. I just continue use original cab cause it's insanely built well and insanely braced even though the cab is beat to shit.

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OJneg

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Re: 15" Subwoofer Build
« Reply #13 on: August 19, 2015, 12:26:57 AM »

A jbl 2226 15" driver would been great to experiment with. They can take crap load abuse. They're were used in theater and pro use.  I have a 4648-8a theater sub with dual 2226j 15" woofers and they can seriously take some abuse and can handle more power then they're rated for but, might not be something everyone be fond of cause the 4648 sub is heavey at 150lbs and really bulky... But, that's that cab. I just continue use original cab cause it's insanely built well and insanely braced even though the cab is beat to shit.



Thanks Rex. I'm curious about a better high-efficiency pro-audio driver. Basically an Alpha 15A with bigger magnet, more linearity, lower Fs, better performer all around. I like the 15A better sealed than OB. Will look into that one.
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Marvey

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Re: 15" Subwoofer Build
« Reply #14 on: August 19, 2015, 01:26:10 AM »

Don't get obsessive about specs or T/S parameters. It doesn't better than these JBL drivers (although JBL is EXPENSIVE). There are tricks for making pro drivers such as this into a sub: take advantage of its super efficiency and typical room nodes. This means EBS alignment (larger box and port frequency lower than is usual) and crossing over lower than most people would do per spec. Think outside of the box. Trade the efficiency for bass extension. That being said, you would need a LOT of internal volume... maybe 3-5 cubic feet or more. (I haven't crunched numbers, but this is a guess, and your PEX DIY cabinet probably wouldn't work).

There are a lot of drivers with the right specs... but most end up sounding craptastic.
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RexAeterna

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Re: 15" Subwoofer Build
« Reply #15 on: August 19, 2015, 04:47:55 AM »

Yea. The jbl is also rated for long excursion same with other good pro woofers so they will be able to sustain the really low frequencies well. Jbls are pricey unless going in used market and even then it's hit or miss. I got lucky with mine cause they were missing dustcaps and cabs ruffed up with rough scratches and chip here and there on the cab but, didn't care as long they worked I was happy and didn't mind putting work into them.

The peavey low maxx and low riders have deeper cuts in the magnets for that very reason. You can trade the efficiency a bit for extra extension especially if you have the amp that can make up for the 3 or so db loss.

Peavey subs are not bad and not bad price especially for their performance. Only other thing I like bout them too is they're completely field replaceable so you can just unbolt the fried driver and place new basket in and you'll be good to go. Not built like jbls but are not bad either if you give them a low crossover point.  Lot of pro woofers don't sound bad. Only time where one shines over the other is when you cross them over too high... Most pro woofers don't do well above 800-1.5khz but, never expect them too since they were designed and meant for low frequency use.
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''I'm a music lover. Not an audiophile.''

''The World is Study.''

''I have no special talent. I am only passionately curious.''

''Logic will get you from A to B. Imagination will take you everywhere.''
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