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Old 02-14-08, 09:16 PM   #10 (Link)
 
rbartyczak
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Re: My 1st Sonotube sub - 40-19 Stealth Sub


Quote:
Robert_J wrote: View Post
120 w @ 8 ohms is more like 190 w @ 4 ohms. Not even high current car amps can more than double their output by cutting the resistance in half. And it was a good thing you didn't try to bridge it. Unless your receiver says it is bridgable (99.9% aren't) then you could have fried it and the sub by doing it.
Robert,

Before I purchased the Kenwood KR-V990D, I did quite a bit of research on it. It was Kenwood's first AC-3 (i.e., Dolby Digital) receiver and their top of the line receiver at the time (1996). There were only two other Dolby Digital amp/receiver that I could find at the time; a Yamaha (DSP-A3090) and a Denon (AVR-5600). Both of those units were selling in the $2,000+ range. The Kenwood listed for $1,200 and selling for about $1,000. Based on the articles that I read, its amplifier section was very robust. The product information sheet from Kenwood Electronics Deutschland showed the following information: Sinusleistung 2 x 120 Watt (DIN, 1kHz, 8 Ohm), Dynaikleistung 2 x 290 Watt (4 Ohm), Surroundbetrieb 3 x 100 Watt + 2 x 50 Watt.

I can't find the information any longer, but I believe it may have been from review (in Stereo Review or some other respected audio magazine) that indicated that the amp could be bridged to obtain an output of something like 420 Watt at (2 Ohm).

I found these output numbers very impressive, to say the least. However, I was actually somewhat disappointed in the surround sound (Dolby Digital) output when I was using this receiver. Switching to the stereo mode or "line straight" mode seemed to kick the amplifier up several notches -- cleaner and more robust sound. The receiver's amplifier seems to drive the subwoofer to sufficiently satisfying SPLs just fine which, in the end, is what I was hoping for.


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