Jeff Rowland amp in unbalanced mode

I can confirm that current JRDG amps are fully balanced in the input as well as in the output stages. According to Jeff Rowland, his amps put out an active signal on both positive and negative speaker terminals.

Hi Kijanki, have you considered adding a JRDG PC1 Power Factor Correction unit to feed your 102? I have heard that it is designed to enhance significantly its performance, but have not heard directly from anyone who has tried the PC1 on either 102, 201, or 501. PFC is already built into the Continuum 500 integrated, and the 312 amp. Guido

Guidocorona - There are two styles of class D output. One, like Icepower, uses single supply voltage and changes direction using mosfet full-bridge while the other style, like Hypex (Channel Island) uses two voltages positive and negative with mosfet half-bridge. First style sounds a little closer to tubes (even harmonics) but has half of supply voltage (DC) on both output terminals (doesn't bother me). Also bridging amps is not possible since it is already full bridge output. My small 102 has the highest bandwidth of the tree you mentioned and I don't listen very loud. I read your other posts on the PC1 and since you mentioned that my 102 is "eligible" I'm very interested. I have to upgrade speakers first (major expense) then I'll move to power supply. I'm sceptic about things like that, but I remember that at the beginning I was sceptic about interconnects and speaker cables - not anymore. Keep us informed! Is it expensive? I read review (AudioEnz) of 102/Capri and while Capri is better of two (exceptional) 102 is not bad, especially for the price.

Hi Kijanki, I looked for the Capri/102 review by Audioenz but could not find it. . . could you post the URL?
The PC1 is unfortunately not inexpensive, at $1500 list, but some dealers have sometimes offered a demo unit for quite a bit less. One good thing about it is that if you ever upgraded to 201 monos or 501 monos, the PC1 would serve there as well. Guido

Guido - www.audioenz.co.nz/2007/rowland_capri-102.shtml

Thank you Kijanki, much appreciated. . . now I remember reading this review a while ago. Can't help thinking that the relative darkness, moderate downward extension, slight imaging problems, and other minor quibbles that Mr. Wong observed may have been caused by less than complete break in of the equipment. Capri is a bear to break in, requiring perhaps 1000 hrs. . . not sure about 102, but I wouldn't be surprised if it required more of the same. G.