System that sounds so real it is easy to mistaken it is not live

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.

the JC 1+ puts around 300 watts at 16 ohms and can handle even higher  impedance with absolute aplomb.

@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.

@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.

As a 25 year user of an Atmasphere OTL, I can tell you that with these amps  a failing tube signals its demise rather gently. But keeping them in open air for ventilation and in plain sight is a good idea.

@atmasphere , I should have phrased that differently. It is the SLs that do not like making bass. The MA 2's should be fine driving the SLs in the bass because the impedance is so high. I am not asking the MA 2's to drive 2 ohm subwoofers.

@rauliruegas , I had Velodyn subs for the better part of a decade. The surrounds corroded and they literally fell apart. I can not quote you figures but I do know that given appropriately large drivers in well constructed sealed enclosures distortion levels are easily under 0.5%. It is only when using smaller drivers in flimsy enclosures that distortion becomes a problem.  An amplifier that has tight control over the driver like the JC 1s with their damping factor over 1000 will result in excellent performance far in excess of what any Class D plate amplifier can provide assuming a large driver in a well constructed enclosure of which there are very few. The Velodyns do not qualify as a well constructed enclosure. No commercial subwoofer excepting the Magico Q series qualifies. If you commission me I will build you a knock out set of subwoofers.