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Old 24th December 2005, 03:06 AM   #1
v1d9uy is offline v1d9uy  United States
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Default newb center channel

well i am in need of a better center channel and im currently doing the hole diy projector thing ... so i started looking around at other diy stuff and since i need a center channel i figured why not. now this will be my first attempt at building a speaker... so anyone have any suggestions for a relitively cheap design ? like under $100 ? and is that a decent goal for a center channel ? right now im useing a center channel from a small polk mini sorround system its got 2 x 2inch drivers and a tweet. it just isnt good enough for me when i start playing movies ...
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Old 24th December 2005, 05:51 AM   #2
morbo is offline morbo  Canada
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A single CSS FR125 in the recommended vented or sealed box, with no crossover is my recommendation. Sit it on top/below your TV, perfectly flush. Its very simple, inexpensive, no crossover to build, easy box, and you will get a great result. I am using a WR125 right now and it is an excellent center channel - dialogue is very clear and locked to the screen when I move around the room.
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Old 24th December 2005, 12:49 PM   #3
v1d9uy is offline v1d9uy  United States
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thanks for youre info i found those fr125s at acusticvisions for $70 each is that a good price for them ? right now im useing ssk90ed sony towers and some cr85 boston bookshelves in the rear
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Old 24th December 2005, 06:57 PM   #4
morbo is offline morbo  Canada
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Yup I think Acoustic visions is a good source if you're in the US, for more info on the driver and applications check out www.creativesound.ca, they designed the driver and have lots of possible projects, measurements and application notes. If you want any info on my center channel, just send me a PM and I can send you the dimensions etc. I really think this is a good way to get youre 'feet wet' in DIY, I doubt you could pick a better bang for your buck project.

Just as an FYI, the FR will want to be set to small in the receiver's setup, and the XO should be at least 80hz, 100hz is probably ideal if you don't want to worry about overdriving it at high levels. I cross at 100hz right now and have never managed to overstress it yet.
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Old 24th December 2005, 07:34 PM   #5
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Quote:
Originally posted by morbo
A single CSS FR125
What morbo said

Merry Xmas.

dave
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Old 24th December 2005, 08:52 PM   #6
v1d9uy is offline v1d9uy  United States
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would i gain much running 2 of them ?
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Old 25th December 2005, 04:09 PM   #7
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Quote:
Originally posted by v1d9uy
would i gain much running 2 of them ?
Then you have to worry about lobing/interference issues off axis. In other words, anybody sitting off to the sides would tend to lose the top end. You generally only want a single driver to handle the upper frequencies. If you want "more", you'd probably want to add a woofer or woofers instead of another full range, but then you get into crossover design and suddenly your project isn't so simple any more
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Old 25th December 2005, 08:26 PM   #8
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Quote:
Originally posted by v1d9uy
would i gain much running 2 of them ?
Only if you put it on the back -- no bafflestep, greater bass capability (not lower just more), and active force cancellation.

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Old 26th December 2005, 07:15 PM   #9
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Quote:
Originally posted by planet10


Only if you put it on the back -- no bafflestep, greater bass capability (not lower just more), and active force cancellation.

dave

planet10, couldn't you put the 0.5 woofer on the front and still achieve the same result (without the force cancellation, of course)?

EDIT: OK, I see you have not specifically mentioned the use of the 2nd driver for BSC-only. If it were run full-range, I'd put it at the back, also.
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Old 26th December 2005, 10:34 PM   #10
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Quote:
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couldn't you put the 0.5 woofer on the front and still achieve the same result (without the force cancellation, of course)?
Force cancellation is only one thing you lose by moving it to the front. You no longer have perfect BSC, and you gain some phase canllation in the octave or so above its roll off point.

Another thread has an ongoing discussion on this:

FR125 New Design Options - Feedback Requested

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