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In Reply to: RE: There is someting to this high powered amp approach posted by Freo-1 on February 01, 2016 at 18:24:51
And improve bass response you should consider adding a sub. The speaker rolls off above 50 anyway. Getting a sub will allow better bass and as importantly you can then send less LF to the ATC's which will make the amp you drive them with operate much better. I was an ATC dealer and this was a good solution when done right.
ET
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Done right is the real point. You need to pick the crossover point well and use a sub that is well damped. The ATC has a Q of 0.707 and if the sub doesn't do at least as well you'll gain bass and lose bass quality.
Thanks for all the responses. Lots of good questions/comments. I'll try to address some of the questions as follows:
1. The solid state amps (Pass Labs, Electrocompaniet) that I had on hand were between 120 and 150 watts at @ 8 ohms. Perhaps the 250 watt Pass Labs would have done the trick. Having said that, the Mcintosh amp at 270 watts sounds great with the speakers. Makes me wonder if a second 7270 in mono would be even better.
2. I do have subwoofers with the speakers. I have a SVS SB13 Ultra, along with an ATC C1 sub. The speakers are run full range, as suggested by the SVS team.
3. I have tried a number of preamps with this setup (Electrocompaniet EC4.7, Mcintosh MX-119, Classe DR-6R, Innersound, and a Thomas Meyer 6AH4 clone). The various preamp setups did not make much difference regarding when the SS amps started running out of steam. The Classe preamp seems to have a tad more drive of the bunch. It is a great match for the tube power amps as well.
4. The tube power amps actually provide the most pleasing playback (up to a moderately loud volume level). The Mac can actually get the closest to actual live symphonic levels with the SVS sub and still sound natural.
5. Lastly, recently upgraded the crossovers in the speakers with audiophile quality parts. The crossovers are now external, and sport foil coils, Mills non-inductive resistors, and Mundorf caps. I was surprised at the improvement in sound this provided. The speakers had improved clarity, low level detail, and dynamics. This is espcially true with both the tube amps and the 7270.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
If you upgraded the crossover and changed the inductors I hope you have taken care to replicate the original inductors DC resistance as that is one essential aspect of crossover design.
If you haven't the speakers will likely not operate to spec.
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