@rauliruegas, I suppose that makes both of us (without technical foundation). I am moving my JC 1s to subwoofer duty and had a choice between the JC 1+ and the Atma-Sphere MA 2s. Both amps have a reputation for excellent performance on SL speakers. I opted for the MA 2s. They are class A all the way and have a very fast slew rate. Their output impedance is on the high side but I am not using them to make low bass so, that is not important. I also like hand made in America. Atma-Sphere does a beautiful job wiring it's amplifiers.
System that sounds so real it is easy to mistaken it is not live
My current stereo system consists of Oracle turntable with SME IV tonearm, Dynavector XV cartridge feeding Manley Steelhead and two Snappers monoblocks running 15" Tannoy Super Gold Monitors. Half of vinyl records are 45 RMP and were purchased new from Blue Note, AP, MoFI, IMPEX and some others. While some records play better than others none of them make my system sound as good as a live band I happened to see yesterday right on a street. The musicians played at the front of outdoor restaurant. There was a bass guitar, a drummer, a keyboard and a singer. The electric bass guitar was connected to some portable floor speaker and drums were not amplified. The sound of this live music, the sharpness and punch of it, the sound of real drums, the cymbals, the deepness, thunder-like sound of bass guitar coming from probably $500 dollars speaker was simply mind blowing. There is a lot of audiophile gear out there. Some sound better than others. Have you ever listened to a stereo system that produced a sound that would make you believe it was a real live music or live band performance at front of you?
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The Sound Lab has its highest impedances in the bass region. That is why solid state amps struggle to drive them- they can't make the power. For the MA-2 though its a walk in the park- they play bass very well on that speaker! |
Dear @mijostyn : I think you builded your subwoofers that are digital controled in its parameters and I whish to know which is its THD at 120db SPL at 16hz-20hz.
In my Velodyne's ( sealed design ) its woofers are mated with a self powered amplifier that MEETS all the woffer characteristics along that the woofer is under self " inspection " around 16k times at each second and all those makes that its THD at almost full power been as low as 0.5%.
If you have not " something " that be checking in real time the subs THD then the JC 1+ is not the " best " option because that Parasound was not designed for subwoofers as your desing.
@atmasphere the JC 1+ puts around 300 watts at 16 ohms and can handle even higher impedance with absolute aplomb.
R. |
@rauliruegas That amplifier is designed to operate as a voltage source. The Sound Lab has an impedance peak of about 30 Ohms in the bass. That means that if the JC-1 makes 300 Watts into 16 Ohms it will be a little bit more than half that into 30 Ohms. Being a voltage source, it will cut its power by half with each doubling of impedance.
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@rauliruegas Pardon me for continuing this sidebar. @mijostyn I assume you will not be placing your new Atmasphere MA-2s under the floor as with the JC1s. While heat dissipation is important, I'm more thinking you will want to be able to keep an eye on the tubes. I did have a situation with a tube amp where if I had not been able to see a problem as it occurred the consequences would have been very unpleasant. |
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