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In Reply to: RE: Thinking about biamping posted by tmsorosk on May 17, 2012 at 19:52:27
Are you bi-wiring now? If not do that. I'm a bi-amper and believe in horizontal bi-amp. It's critical to gain/sensivity/ impedance match the two amps. I use two of the same brand of amp where those stats are about identical. I like the improvement of my bi-amp and wouldn't go back. The most noticable improverment was in image quality; both width and depth. I like the idea that the amps now each see one impedance peak and load and not two (I use two way speakers) I think this improves power transfer.
ET
Follow Ups:
Yes I am biwiring now and with much improved results over the MIT Oracles by them selves. It is the system with the Revel Salon ones, they have been slightly upgraded with a tweeter mod. I also built custom stands that set the cabinets on three heavy cones rather than four puny spikes and heavy aluminum cross members. Also built heavy platforms as the prodigious bass the speakers are capable of was activating the floor, isolating them made for punchier and better defined bass.
I was not considering an active cross over. To answer another responders question, I have listened to the Levinson reference #53's and thought there were fine but somewhat sterile sounding for my tastes, not really what I would call eventful, maybe thats what an amp should sound like, ( very neutral without bringing attention to them selves ). I have considered a sweet tube amp for the upper range but understand that may be harder to get the right match, I would also have to alter my listening habits as I have the system in the middle of the house and listen and leave it on constantly.
I think bi-amping works fine with the speakers internal crossover. If you did by an active crossover you'd really need to connect the amps directly to the drivers for proper implementation. Good luck with your quest.
ET
I have a pair of Legacy Audio Signature IIIs, which are a tough load for amplifiers, even though they are 93 db@1 watt. They are nominal 4 ohm load, and were measured as low as 1.1 ohms at 65Hz.
The owner’s manual suggest vertical bi-ampig the speakers. First, it raises the overall nominal impedance to 6 ohms from 4 ohms, and resolves the back EMF for the high level input. So, I have the speakers vertically bi-amped with a pair of Threshold SA/3 50 wpc class A amplifiers. This sounds quite a bit better than using a single STASIS 2 Threshold (200 wpc class A/B).
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
I used to sell those. I didn't realize they dipped that low at 65. I think though that any style of bi-amp will raise the impedance to 6. For me having two amps of different power levels yet the same impedance/sensitivity and gain made horizontal the only option. I'm not surprised with your results based on that info and the Thresholds are nice, gutsy and plenty of power for the application. I'm glad you found a scenario that works well. Enjoy!
ET
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