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In Reply to: A Five-Channel SET Amp for Home Theater? YES!!! (link enclosed) posted by Scott on December 01, 1999 at 15:10:09:
Scott,Be patient. Working back from 5 matching Dunlavy SM-I's I'm shopping around for an A/V reciever, or more likely, seperates. Been looking at a lot of SS amps but am getting more curious about tubes. What concerns me is that there seems to be such a huge power rating difference between the two. I wasn't even considering an SS under 100w RMS @ 8 oHMS but here we have a tube amp with a much lower power rating. Can this amp from AES, or any other tube amp give me the glow and the go.
Mark
Mark,You will need speakers that have a flat impendance curve and high sensitivity to be able to use 7 watts effectively for music and HT. The size of your room will also be an important consideration as larger rooms will need more power then smaller ones to maintain the same SPL level. Sometimes the best way to know if a tube amp will work effectively is to try it out, in your system.
Michael,Check these numbers out and tell me what you think. In the literature provided by Dunlavy my SM-I's have the following spects:
Amplitude/Frequency Response: +/- 1 dB from 60-20,000 (-3 dB at 45Hz)
Phase/Frequency Response: less than +/- 20 degrees from 150-10,000 Hz.
SPL Rating: greater than 91 dB SPL for an input of 2.83 Volts/RMS
Impedance: Nominal 5 Ohms (3 Ohms TO 6 Ohms, with 12 Ohms at bass resonance
and a maximum reactance "angle" of about 30 degrees.Bass Resonance: Approx. 51 Hz
Power: All drivers and crossovers components are designed to handle peak
powers up to approx. 100 watts for 10 milliseconds or an average
(pink noise) power of 10 watts (101 dB SPL at 1 meter)Mark
Mark,The 3 ohm drop would definately be a tough load for a Single Ended tube amp. I would consider a push-pull tube amp for the Dunlavy SM-I speakers you are considering.
Michael,I must concure. Just finished reading Harvey Rosenberg's "Understanding Tube Electronics II" and quickly realized that my SM-I's are not well suited for an SE amp. However, I might try a push/pull design and see what happens. Or better yet reassign the speakers to a purely HT role and buy or make a pair of more efficient speakers for dedicated listening. My only caveat is that my wife will kill me if I start talking "another set of speakers" Any ideas on how to make an end around move on her, i.e. make a pair of my own in my covert lab. Any suggestions on where I can get my hands on some high efficiency drivers for a DYI project?
Mark
I agree, impedence should not swing more than a couple of ohms minimum/nominal when using SETs.
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