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Old 30th March 2007, 11:58 PM   #1
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Thumbs up Wall mounted speaker project for LCD TV

I just purchased a 42" LCD since my old 27" from Junior High decided to finally give in and die. The LCD has terrible sounding speakers on it, but they can be removed (designed that way). The LCD has speaker outputs rated at 10W x 10W (not sure into what load). I am planning on building some thin profile 2-way units to mount on the wall next to the TV.

I'm thinking Dayton RS125-4 5" paired with a Vifa DX25TG-05-04 tweeter.

Sealed box: 0.153 ft^3 gives an F3 of about 88hz
I'm thinking a 4th order Linkwitz-Riley on both woofer and tweeter, crossing over at 1.8khz.

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My rough enclosure design has a 6" face, 9" back plate, is about 12.5" tall and has rounded front corners.

I'm looking for any input on the crossover mostly. Anybody with experience with these drivers have any pointers (looking at Zaph)? I'm also wondering if the speakers would present an unreasonably hard to drive load for the TVs amp (rather low impedance speakers).

More thoughts, ramblings and progress reports to follow.....
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Old 1st April 2007, 12:38 AM   #2
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I think u may want to push that crossover to 2khz, just because in my experience there can be a little bit of ringing below 2 with that tweeter. You may end up deciding that ul need a notch filter to tame those huge breakup nodes in the woofer. and obviously dont forget to consider a resistor to tone down the tweeter to match the woofer. I don't think ul need a zobel if your going fourth order. My concern with driving the speakers is not so much the impedance but the very low efficiency ul have after fourth order slopes. Then again if ur just listening to the news... how loud does it have to be?


Just things to consider. Dont worry to much if they are just tv speakers... minimize the effort.
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Old 2nd April 2007, 04:19 AM   #3
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I was hoping to avoid having to deal with the cone breakups on the RS125 by crossing over low and steep (the worst breakup is at ~12khz if I'm remembering correctly). Yeah, the low efficiency is causing me to consider just putting some Fostex FE126E into small ported boxes of similair design (slot ports coming out the bottom). That'd make for much higher efficiency......

I'll probably make my mind up Monday after I try hooking up a few different pairs of my existing speakers up to the LCD's outputs and seeing how well it handles the loads (see how honest the 10W output really is).
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