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Old 2nd October 2013, 10:40 PM   #1
ODougbo is offline ODougbo  United States
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Default Help - My Speakers Are Too Small

This is my friends HT, worked on the speakers way back when and now realize they are too small.
Just picked up a new/used mtm center, so can use that and re-build the 3 set (have plenty of drivers)

Thinking mtm's with old drivers and the Vifa XT25, in 20 - 23liter BR boxes.

What's needed? mtm xo design, with the Peerless 832591/Vifa XT25.

Any help with a crossover design would be gratefully appreciated.

Woofer: Thlele Parameters attached:

Tweeter - http://www.parts-express.com/pdf/264-1016s.pdf

Thanks!
Attached Images
File Type: jpg Peerless for HT.jpg (88.2 KB, 577 views)
File Type: jpg Peerless for HT 2.jpg (22.4 KB, 575 views)
Attached Files
File Type: pdf 832591 5 woofer.pdf (426.3 KB, 9 views)

Last edited by ODougbo; 2nd October 2013 at 11:10 PM.
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Old 2nd October 2013, 11:16 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

You need to know a lot more than you do before you can say speakers
are too small or not and your questions make no sense whatsoever.

rgds, sreten.

If you built the original speakers I wouldn't be surprised they are wrong.
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Last edited by sreten; 2nd October 2013 at 11:20 PM.
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Old 2nd October 2013, 11:35 PM   #3
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how too small? The easiest way to embiggen them is probably to add a couple of decent sized woofers of appropriate sensitivity, crossed over at the baffle step freq....
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 2nd October 2013, 11:46 PM   #4
SY is offline SY  United States
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LOL, that's a perfectly cromulent suggestion.
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Old 3rd October 2013, 01:06 AM   #5
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Quote:
Originally Posted by PeteMcK View Post
how too small? The easiest way to embiggen them is probably to add a couple of decent sized woofers of appropriate sensitivity, crossed over at the baffle step freq....
+1

dave
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Old 3rd October 2013, 08:45 AM   #6
ODougbo is offline ODougbo  United States
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Oh I think some would be surprised if they heard some of them, no one can say I give up easily
The smallish BB set is the best here, what's embarrassing is they were here the whole time, at the bottom of the heap. btw, thanks to Sreten, I did turn the smaller coils - Vifa M18WO-09-08 Revisited

The question here is clear, simply looking for a xo design using the Peerless 5" and Vifa XT25 in a 20 - 23liters mtm box; going to copy this box idea.

HT02.JPG
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Old 3rd October 2013, 09:23 AM   #7
ODougbo is offline ODougbo  United States
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Maybe someone can make a xo point suggestion?

3,000hz or above?

PeerlessVifa.jpg
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Old 3rd October 2013, 11:17 AM   #8
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I still don't know what you're asking us. Are you wanting to know if that's a good idea, or looking for direction suggestions? Truthfully, no speaker is too small for anything unless the situation dictates it. We can't make that conclusion here because you have not said why they're too small.
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Old 3rd October 2013, 12:14 PM   #9
ODougbo is offline ODougbo  United States
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* Looking for a mtm xo design.

* Helping my friend with a three set of mtm's for the HT. The black center speaker in the OP photo is a $300+ MS kit.

* Not much of a crossover in the small white ones, looking for forum help to re-build them. Looking back now, thinking the white boxes are way too small for that driver anyway (which is a whole new topic)

The HT room is in a huge basement, with acoustical tile ceiling and lots of carpet/furniture.

There's been a lot of discussion about the XT25, maybe it won't work
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Old 3rd October 2013, 12:23 PM   #10
Dissi is online now Dissi  Switzerland
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Hi ODougbo,

Doubling up the 5 inchers is the right way to go. Volume of 20 liters and crossover around 3 kHz looks reasonable. I hope your old woofers (20 years?) do still work. Any baffle dimensions?
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