Just picked up these DIY Wilmslow 3-Ways of flea bay... sound awful, help please! - Page 7 - diyAudio
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Multi-Way Conventional loudspeakers with crossovers

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Old 5th February 2014, 03:03 PM   #61
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So at thiss point I'm thinking I'll use a 100mm postal tube, re-enforced with mdf and with the top of a bottle inside to effectively taper the intrnal volume.

In answer to the previous question, the 1.7. Litre volume was simply chosen as that was the volume of the available manufactured back chamber
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Old 5th February 2014, 03:33 PM   #62
Lojzek is offline Lojzek  Croatia
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nannoo,

don't worry too much over internal volume of the chamber behind
midrange driver. 1,7 or 2,0 litres, does not matter. Your looking
at a big peak at resonant frequency od the driver in a box because
of Qt= 1,7. Gotta stuff the chamber well to kill standing waves
and design XO filter which will effectively deal with Mt. Everest
of the driver at Fc. The more you stuff it, the more will decrease
the output at Fc which is good in your case.
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Old 5th February 2014, 04:06 PM   #63
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Yeah, frustratimgly if I'm gonna do this right I'll have to make thr volume first, stuff it then re-measure the imoedance of the drivers. Is there a free program that can measure and export impedance data or should I just manually extract it from arta?
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Old 5th February 2014, 04:23 PM   #64
Lojzek is offline Lojzek  Croatia
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I would have to do some digging to answer you. Can't ARTA export
an impedance plot ?
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Old 5th February 2014, 07:09 PM   #65
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I can't remember if ARTA (the free version) has export capability, maybe only with the paid version... I had problems with ARTA not liking my sound card so didn't continue with it... REW REW - Room EQ Wizard Room Acoustics Software does an excellent job of measuring impedance and definitely can export it.

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Old 6th February 2014, 04:27 AM   #66
frangus is offline frangus  Australia
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Quote:
Originally Posted by nannoo View Post
Is there a free program that can measure and export impedance data...?
Room EQ Wizard

Impedance Measurement

edit: oops sorry Tony, that's what I get for skimming
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Old 6th February 2014, 05:52 AM   #67
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I use LIMP (arta) all the time for free. Just can't save sessions. You can save exported ZMA files.
You can save a screen shot of the impedance plot if you need to.
It works with my old Extigy external soundcard. I had it in storage, and was surprised to see it on the list of known compatible soundcards. So I put it to good use. Measured some woofers that I had the T/S parameters for, and it seems to be really close on all of them. So I am thinking it's good enough.
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Old 18th February 2014, 08:52 PM   #68
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Ok little update, for a long time I've had the 'option' to build an active system for these speakers - I have a spare 4*120W amp 'laying around'...

Anyway, I was looking at this on ebay and wondered what everybody thinks of it:
NEW ! Linkwitz-Riley OPA2134 2-way active filter by KMTech assembled/tested. | eBay

My thoughts are that with a low cost amp laying around and a high quality active xo seemingly available, I should see a vast improvement in performance if I implemented this as my set up, what does everyone else think? Also what would you guys 'plump' for as xo frequency, as this needs to be specified in advance?
I was thinking around 475...
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Old 18th February 2014, 09:31 PM   #69
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Your link didn't work for me, so I googled and found THIS. I take it that's the crossover you're on about?

EDIT: That's odd, my link doesn't work either.

Last edited by fatmarley; 18th February 2014 at 09:34 PM.
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Old 18th February 2014, 10:07 PM   #70
sreten is offline sreten  United Kingdom
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Hi,

Seven pages in and a link (that doesn't work) to a totally
useless active x/o described as "high quality". Nothing
wrong going active bass to mid and passive mid to
treble, in fact a great idea if actually done properly.

rgds, sreten.

I found it but suspect the link won't work :
http://www.ebay.co.uk/itm/NEW-Linkwi...-/111258897390
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Last edited by sreten; 18th February 2014 at 10:13 PM.
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