wireless200;292026 Wrote: > Well I think NewBuyer had it right: you want maximum voltage across the > target but I wanted to hear Sean's explanation. > > > I want to use the TP as a pre-amp and avoid buying a separate pre-amp. > That's why I'm asking these questions. Although it's good information I > don't really want to hear "other's are doing it"... I like to know what > the pros and cons are from a technical perspective. An MC402 by itself > is pricey and if I've got to buy a pre-amp too then I've got to take > that into account for my budget. > > regards, David
Hello David, You asked a question and for advice. Sean answered it (the designer of SB). Then you turn around and disagree with him with some lame wikipedia link. Wikipedia is a large general information source. It is not the exact or absolute answer to a very specific question you posed. >From source to driver device we are not looking for maximum power out (power as in watts), we are looking for maximum efficiency as in signal voltage gain transfer without causing distortion of the audio signal. The wikipedia was describing in general terms maximum power transfer of power in watts to an output device. As in an RF amplifier to an antenna load where impedance mismatch causes output power to be lost in the form of heat. As for the outputs on the Transporter, they are well-designed line level outputs. The unbalanced RCAs have 2Vrms output and the Balanced have 3Vrms (8.5Vpp). Any amplifier with a properly designed input gain stage and 29dB of overall gain is going to be loud enough for most people not to need a pre-amp. More to the point is trying the Transporter alone, if it is not loud enough for your taste, buy or use a pre-amp. A good dealer would most likely let you try this at the shop. If the TP alone does not get loud enough for you, then there is always the Mac I-Amp Model MC6900. Last but not least, what are you trying to drive that needs 400 watts per channel? Most people never use more then the first 25 watts of their amplifier unless they have very inefficient speakers. The Mac MC252 has 250 watts and plenty of dynamic headroom. Yes I have 300 watts per channel. My room is fairly large and my speakers are not the most efficient, but having said that, I would never be able to use more then 2/3 of the power. Turning the pre-amp gain past Two Oclock would cause permanent hearing loss. I would have bought 200 watt mono blocks, but Charles only makes 300 watt mono blocks. -- iPhone iPhone Last.FM http://www.lastfm.com/user/mePhone Media Room: Transporter, Vandersteen Quatro Signature, Ayre MX-R Mono Blocks, VTL TL-6.5 Signature Pre-Amp, VCC-5 Reference Center Channel, four VSM-1 Signatures, Runco 710, RAM Oppo DV970HD, VeraStarr 6.4SE Living Room: SqueezeBox Duet, Vandersteen Model 3A Signature, Two 2Wq subs, VCC-2, Two VSM-1, ADCOM GTP-870HD, Cinepro 3K6SE III Gold Bedroom: Squeezebox 3, Thiel 2.3, NAD C370 ------------------------------------------------------------------------ iPhone's Profile: http://forums.slimdevices.com/member.php?userid=13622 View this thread: http://forums.slimdevices.com/showthread.php?t=46347
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