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Old 19th February 2004, 12:03 PM   #1
Vivek is offline Vivek  India
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Default Help with enclosure design

Hi all, I would like your opinion on this project idea of mine for a floorstander.
I bought two Vifa TC18WG49 (8 ohm) 7 inch mid/bass drivers. I also have a pair of Indian made Peerless mid/bass drivers (12 ohm) and couple of fabric dome tweeters (8 ohm).
Had it not been for financial constraints, I would have made an MTM with the Vifa mid/ bass drivers. But do you think I can put the Vifa and Peerless woofers in parallel and make a two-way floorstander? Or is it better that I make a three-way system?
If this arrangement will work fine, while designing the box, do I have to add up the box volumes for both bass drivers or how do I go about it? The person I bought the Vifas from told me they need about 20L while the Peerless needs about 12L. So will the final enclosure come up to about 32L?

Thanks in advance,
Vivek.
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Old 19th February 2004, 12:09 PM   #2
AGGEMAM is offline AGGEMAM  Denmark
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Do you know the product numbers of the peerless woofer and the tweeter?
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Old 19th February 2004, 12:49 PM   #3
Vivek is offline Vivek  India
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Hi,
These are not the original Danish Peerless. The woofer here is called SKO130 and the tweeter is T25FG.
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Old 19th February 2004, 01:57 PM   #4
AGGEMAM is offline AGGEMAM  Denmark
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Yes, well I can't find any info on them. So I'm not much of a help.

But you should not mount the two woofer in the same enclosure as I pressume the peerless copy is a 5" and the ViFa is a 7". They will not work very well together.

In fact I would probably set the peerless copy aside and only use the vifa woofer in a two-way speaker because the Vifa speaker ae quite good, and very capable of going up to the tweeter.
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Old 19th February 2004, 02:01 PM   #5
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Well this is off topic... But where can you buy indian peerless drivers????
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Old 19th February 2004, 02:37 PM   #6
Vivek is offline Vivek  India
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We used to get them in India but they stopped selling them now. Someone on this forum had mentioned that they are available in Canada.
The Vas of the Vifa is 44L. Will a bookshelf do or will I get better performance out of a floorstander?
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Old 19th February 2004, 03:12 PM   #7
AGGEMAM is offline AGGEMAM  Denmark
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Well, according to ISD Vb=73 liters Vb=32 Hz and if you use a port of 7 cm in diameter it should be 10 cm long.
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Old 19th February 2004, 04:49 PM   #8
Vivek is offline Vivek  India
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So am would I be better off with a floorstander or a bookshelf?
Vivek
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Old 19th February 2004, 05:06 PM   #9
AGGEMAM is offline AGGEMAM  Denmark
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You decide really. But a 73 liter box might be just a little bit big for bookshelf speaker.

If you make a box with these internal measurements it will fulfill your purpose.

WARNING INTERNAL MEASUREMENTS

20 cm wide
40 cm deep
100 cm high

That's 80 liters, but with bracing, drivers, port, filter etc it'll be about 72-75 liters when completed.
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Old 19th February 2004, 05:22 PM   #10
Vivek is offline Vivek  India
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Thanks for that. But could you compare in short bookshelf Vs. floorstander. If you can suggest a website where these are explained, I will be grateful. I have been searching the net but have not found what I am looking for.
Space is not a constraint for me. If my Vifa will sound better (I mean bass) in a floorstander, fine. If my driver will perform better in a bookshelf, I am for it. What do you say?
For the measurements you suggested, it has to be a floorstander.
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