DIY subwoofer with TRIO 15" woofer - diyAudio
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Old 24th March 2014, 08:22 PM   #1
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Default DIY subwoofer with TRIO 15" woofer

Hi guys!
Just acquired a pair of TRIO (Kenwood) 15" woofers (T11-0043-05), and I want to use it in a DIY sub project. Unfortunatelly I don't know any parameters of the driver, and couldn't find any in the internet too. Maybe somebody knows the driver and/or knows what is the best cabinet for it?! Or maybe somebody knows the parameters needed to design a cabinet?
For the first run I'm going to try to drive it (go active) by a cheap D-class "e-bay" sub amp...
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Old 24th March 2014, 09:04 PM   #2
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Hello,

These do no look like subwoofer material at all, but rather a 1970's high efficiency midbass.

It is simple enough to put together a measurement rig in order to measure T/S parameters. They have inevitably shifted some of time, as these surrounds tend to stiffen up.

If I had to give a rough guess at things, I would do the pair in 8 cubic feet tuned to 30 Hz and EQ a bit, as needed.
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Old 24th March 2014, 09:17 PM   #3
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Quote:
Originally Posted by cbrunhaver View Post
Hello,

These do no look like subwoofer material at all, but rather a 1970's high efficiency midbass.

It is simple enough to put together a measurement rig in order to measure T/S parameters. They have inevitably shifted some of time, as these surrounds tend to stiffen up.

If I had to give a rough guess at things, I would do the pair in 8 cubic feet tuned to 30 Hz and EQ a bit, as needed.
What do you mean by tuning it to 30Hz? Reflex box?
I need some bass fundament since my Lowther DX3 horns lack the low bass. They are fantastic on high and vocal, even mid bass is tight, but for my ears rollof begins at about 100Hz. Maybe my SET 300B amp plays a big role here too. I'm sure the kenwood 15" fed by a D-class amp will give lot more bass than the Lowthers...
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Old 24th March 2014, 09:28 PM   #4
tinitus is offline tinitus  Europe
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any pics of these interesting woofers ?

specs ?
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Old 24th March 2014, 09:31 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

I agree with the post # 2, subwoofer drivers they are not.
Though I don't agree with the suggested vented cabinet,
its a wing and a prayer approach, unlikely to work well.

My rough guess is they can't be used vented efficiently,
erring on the side of caution than hoping for the best.

Click the image to open in full size.

Small sealed cabinets for a 15" which bodes badly for
a sub, for what is clearly a very high efficiency speaker.

My best guess you don't want to hear, high Q, high Fs *, poor excursion.
(Its only a guess, based on the most common alignment of such
speakers with a peaking sealed bottom end to do baffle issues.)

They are 30W rms 100W peak allegedly, sounds reasonable.

rgds, sreten.

Simple enough stuff to just measure impedance will ascertain
Fs and Qts** in open air. Same measurement with an enclosing
volume will ascertain Vas, They are the 3 parameters needed.

* It is possible they are low Qts and low Fs used in a cabinet
of far smaller volume than Vas, and thus suited to vented,
but I wouldn't assume that, its not the most likely.

** Qts is derived from the shape of the impedance peak.
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Last edited by sreten; 24th March 2014 at 09:50 PM.
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Old 24th March 2014, 09:35 PM   #6
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by sreten View Post
I agree with the previous post, subwoofer drivers they are not.
easy talking

Quote:
Originally Posted by marekocska View Post
I need some bass fundament since my Lowther DX3 horns lack the low bass.
maybe if we move it out of subwoofers and to fullrange, and it may be just about right for a big fast system
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Old 24th March 2014, 09:40 PM   #7
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Quote:
Originally Posted by tinitus View Post
any pics of these interesting woofers ?

specs ?
sorry, no specs, that's my problem
I have some pics, but drom internet:
the woofers
Click the image to open in full size.

the speaker tha features the woofers
Click the image to open in full size.
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Old 24th March 2014, 09:46 PM   #8
tinitus is offline tinitus  Europe
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nice

didn't Kenwood also sell DIY drivers later on ?

I would try a 500-1000 liter box, without any bottom, and lifted as bit from the floor
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Old 24th March 2014, 10:00 PM   #9
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I don't know, if they used to sell DIY speakers.

Here in Budapest there's a shop where they measure speakers for 10 USD. I'll get them there. 500l cabinet is huge!!! I'll try it in a aproximatelly 120l box without bottom, because I have no more room...or maybe a Lukasz Fikus (Lampizator.eu) design, a 50cm x 50cm x 50cm box without back (folded open baffle?)
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Old 24th March 2014, 10:03 PM   #10
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by tinitus View Post

I would try a 500-1000 liter box, without any bottom, and lifted as bit from the floor
Hi,

That is quite the most utterly ludicrous advice * I've ever read in all
my (long) time on this forum, an 18 to 36cuft box with no bottom.

I don't need to explain why. How you got there I don't know ....

Easy talking ....

rgds, sreten.

* being plausibly correct rather than just plain completely wrong.
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Last edited by sreten; 24th March 2014 at 10:21 PM.
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