Q& Q&A - #6 - April 3, 1997 Q In reading your review of the Sunfire Subwoofer, I found something that just doesn't sound right. Your power calculation. If you use 120 volts for the voltage input to the amp, this is already an rms equivalent. The peak voltage from the AC line is approx. Also, there is no duty cycle associated with the line voltage, it is simply 120V rms x 3.5A = 420W. If efficiency is 90% (power out/power in), then the resulting output power = 378W.

Please clarify this if I have overlooked something, it seems straight forward. A The effective rms value for the 120 line voltage is not 120 V in the power supply of the Sunfire Subwoofer. Look at a diagram [ ] which represents the situation in the Sunfire. There is a 1/5 duty cycle at B+ and B-, so the calculation of the effective rms value (Vrms) is 120 x 1.414 = 169.68; Vrms = Square root of (169.68 squared/5) = 75.88 Vrms. Q Hello: I think I just found a wonderful web location.

I am considering purchasing Klipschorn speakers. What do you think. They sound wonderful in the store.

They were powered by a Cary amp. I can't afford Cary. The vendor said a Carver HTR-880 Receiver would power the Klipschorns and five smaller sets of wall speakers I have in other rooms in my house at the same time. Is that true? As you know the Klipschorn speakers are built to fit snugly into wall corners. The way my house is constructed one speaker would be one inch from the wall on both sides; the other speaker would be one inch from one wall and 2 inches from the other wall. Will that placement significantly affect sound quality?

If the 880 Receiver is not adequate, what do you recommend. Another person recommended a separate amplifier with 200 watts per side. I am a novice and I need help. I am not rich!

Jan 4, 2017 - I did find a link to a manual, but it was dead:( You best bet for information is the Carver Forum. Not official, but I am sure that if you have one of.

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However, I did like the Klipschorns very much. I am thinking of an amp in the range of $1,000-$1,500 (please don't laugh). Thank you for your help. A Even though the Klipsch are efficient, it seems that you might be using more than one set of speakers at the same time. This places large current demands on the amplifier. Therefore, I would suggest that you get separates, since amps in receivers are usually not built for heavy current requirements. On the other hand, as long as the receiver has pre-out RCA jacks, you can connect more powerful amplifiers to the receiver and accomplish the same thing.

You may want to add surround sound later on, so get a receiver (or preamp/processor) that has surround sound decoding, and just use the stereo channels for the time being. Carver has good products.

I also saw a Yamaha 2090 now on sale for $1,000, which is a bargain. It has the 5.1 set of inputs that will keep you forward compatible (AC-3 and DTS). Q I have two issues that I am confused about and I was hoping that you could help me. The first question has to do with amplifier power. My receiver is a Pioneer VSX-503. It is not supposed to be able to drive 4 ohm loads but in the back of the manual it gives a dynamic power.

The values are 2 ohms = 265 watts, 4 ohms = 240 watts, and 8 ohms = 170 watts. What does this mean? The receiver is supposed to only output 110 watts into 8 ohms.

Could you clear this up for me? Also, on most new components I have noticed the component control connections. According to the manuals these systems help components of the same brand communicate to make operation easier. What exactly do these features do and are any of the different brands compatible? A few examples of these systems are: the Pioneer control jacks or the Kenwood CCRS system. Thanks for your help!

A Dynamic power is a term used by the mass market component manufacturers. It means the power that an amplifier can deliver on a short term basis (a transient peak, such as a gun shot or snare drum crack) into the speaker load. The 110 w/ch rating of your receiver is the rms rating, that is, continuous power into the 8 Ohm speaker load.

It will also deliver 170 w/ch into 8 Ohms, 240 w/ch into 4 Ohms, and 265 w/ch into 2 Ohms for the short (transient) peaks. An 8 Ohm speaker is not 8 Ohms across its entire audio spectrum, but rather, it averages 8 Ohms.

At any one frequency, the impedance might be 5 Ohms, 8 Ohms, 11 Ohms, etc. A 4 Ohm speaker might go down to 3 Ohms and up to 10 Ohms.