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Uk subwoofer building - Where's the value at?
Uk subwoofer building - Where's the value at?
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Old 22nd March 2020, 08:10 PM   #31
KaffiMann is offline KaffiMann  Norway
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Uk subwoofer building - Where's the value at?
IMO It's not much to think about really, the SB driver costs the same as two 12BR70's. Sound quality should be very compareable.

I made a video of my daughters 12BR70 TQWT's today, will see if I can get around to editing a bit if you're interested. No measurements ATM, but they're powered by a cheap TPA3255 ebay amp and a brick PSU, I estimate some of the quite bass heavy music I tested with was well above 100db, probably around 108db if my estimations still work.

The simulations I posted was for halfspace, so you should get better than that indoors, I don't like to give over-optimistic numbers.

I agree! This forum is great!
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Old 23rd March 2020, 02:29 PM   #32
jjams82 is offline jjams82  United Kingdom
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^If you can chuck a bit on youtube I'd be curious... Don't spend too much time on it though, I'll live either way

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Old 25th March 2020, 10:59 AM   #33
KaffiMann is offline KaffiMann  Norway
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Uk subwoofer building - Where's the value at?
I've just started having a look at the videos, but when I'm pushin them a bit the mic distorts.
The video sound is not horrible, but there seems to be some compression kicking in at some point, makes it sound more muddy and the top end and mids are lacking a fair bit because of it. In real life it sounds real crisp and clean, no distortion whatsoever.

Another thing to note is that these boxes are twice the size of what you're looking at, and you'll get a bit more excursion since you don't get the acoustic resonance of ported designs. But in these boxes my daughter have, the 12BR70's never really get to "stretch their legs" at all. She's a real bass head, don't know where she get's it from. But I guess we've all been there at some point.

Here ya go:
YouTube
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Old 26th March 2020, 01:34 AM   #34
jjams82 is offline jjams82  United Kingdom
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Many thanks! Unfortunately when i came to check the thread I'm in the middle of a power cut!

Ahhh... the joys of the apocalypse eh. When the power comes back up I'll check it out
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Old 26th March 2020, 01:46 AM   #35
Alekk is offline Alekk  United States
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Uk subwoofer building - Where's the value at?
A reliable 20Hz is going to require at least 2 12" woofers or a good 15. A Dayton Ultimax 15 through Amazon UK is about 300GBP with shipping (shipping from NL). A nice vented cabinet should be another 100-150 (~2cm-thick MDF, bracing, and a pair of flared ports), but it'll *definitely* get you to 20Hz. You'll just need an active crossover to blend into the mains. It'll definitely blow anything similarly priced out of the water in terms of bottom-end heft. Only problem is, you're looking at a much larger box (think 170L, ~63cmx60cmx45cm). With a 15Hz subsonic filter, you can achieve a maximum output of about 110dB (1 meter distance) at 20Hz, with 115dB at 30Hz before hitting XMax (this is on 550W of power).

It might sound like overkill in terms of output, but a 15" woofer will have far less distortion due to the larger surface area and lower excursion relative to a smaller cone (at the same output level).
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Last edited by Alekk; 26th March 2020 at 02:12 AM.
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Old 26th March 2020, 08:55 AM   #36
jjams82 is offline jjams82  United Kingdom
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Alekk As much as I love the idea, the room is to small for that and I don't need much in the way of levels, neighbours... They're good as far as neighbours go, but I don't want to push it with a reliable 20Hz in a 6x4m (total guess) bedroom that adjoins their house. A reliable 25-30Hz will cause enough trouble as it is, much bass chaos to be tamed. Many thanks anyway though.

KaffiMann Power is back! Ahh, the joys of living semi-countryside. Thanks very very much for that!! Took a bit of setup and editing! When you wrote "going for the drum&bass version" I thought "yes!! Perfect!!". Shame it scared away the boss though - but hey, you got good kids there if they enjoy a setup like that.

The last tune sealed it for me. They do the job! Thanks for your effort there, I really appreciate it
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Old 26th March 2020, 05:00 PM   #37
waxx is online now waxx  Belgium
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Quote:
Originally Posted by KaffiMann View Post
I've just started having a look at the videos, but when I'm pushin them a bit the mic distorts.
The video sound is not horrible, but there seems to be some compression kicking in at some point, makes it sound more muddy and the top end and mids are lacking a fair bit because of it. In real life it sounds real crisp and clean, no distortion whatsoever.

Another thing to note is that these boxes are twice the size of what you're looking at, and you'll get a bit more excursion since you don't get the acoustic resonance of ported designs. But in these boxes my daughter have, the 12BR70's never really get to "stretch their legs" at all. She's a real bass head, don't know where she get's it from. But I guess we've all been there at some point.

Here ya go:
YouTube

I got a very similar speaker system, Mark Audio Alpair 10M sealed tops but 10 Scanspeak 26W/8534G00 subs in sealed speakers and they give me everything i need. The subs are smaller altough, only 77L and with an good response (F6) of 32Hz. But i use a passive crossover and a tube amp with it. Not dsp and a chipamp.

And i listen partly to very similar music, reggae, dub, jungle & co... but i'm also a jazz freak and listen to a lot of other music also. Your daughter is spoiled with that setup...
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Old 26th March 2020, 05:10 PM   #38
jjams82 is offline jjams82  United Kingdom
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Originally Posted by waxx View Post
Your daughter is spoiled with that setup...
Lucky kid? Or an excellent dad? Both I think.
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Old Yesterday, 11:09 PM   #39
jjams82 is offline jjams82  United Kingdom
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Originally Posted by zerokelvin99 View Post
Alternatively, I know of people using the A800 with success in sub applications. 185.

Not sure I'd want to push it at 4R, but at 8R it'll give 220Wpc
I'm starting to go about this backwards, and buy an amp.

Thing I like about this A800 is that it it's convection cooled - no bloody fan making noise!





Any other no-fan sub amps in this price range I should be thinking about?
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Old Today, 01:17 PM   #40
David Morison is offline David Morison  Scotland
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Originally Posted by jjams82 View Post
Thing I like about this A800 is that it it's convection cooled - no bloody fan making noise!

Any other no-fan sub amps in this price range I should be thinking about?
Kip has a thread on quiet amps over in the PA subforum, if you haven't seen it already: Quiet PA amps.
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