Pass Labs versus Jeff Rowland, Audio Research


As I am considering replacing my trusty pair of Jeff Rowland 7M monoblocks, feeding a pair of MagnePan IIIAs, I am looking at both the current Jeff Rowland lineup, as well as at the latest incarnation of the Pass Labs X series, dubbed the X.5 series, and some Audio Research models.

In the Rowland lineup I am considering the 501 monoblocks, or the 302 stereo amp, while I have already determined first hand that the smaller 201 monoblocks do not drive the MagnePan IIIA pair adequately.

In the Pass Labs lineup I will consider the X-250.5 (already released), the X-350.5 (just out of engineering), and the upcoming X-600.5.

From Audio Research I already discarded the otherwise extremely lovely VT100 as just slightly underpowered for the Maggies, but will consider the VT200 stereo, the new VSM220 monoblocks, as well as the VTM200 monoblocks.

The rest of my system consists of EAD T1000 CD transport and EAD DSP7000 Mk3 (these likely to be replaced by Esoteric X-01, and an Audio Research LS2B.
I most listen to classical, and within it more to solos and small ensambles than to large orchestra.

I'd value all opinions! In particular any comments concerning the relative merits of the newest Pass amps vs the other brands would be very appreciated.
According to Pass and to those dealers that have already the new X.5 models, these new boxes have a more refined and detailed sound than the old X models, and a fuller fleshed-out midrange. But, how do they truly stack up to Rowland and Audio Research?
guidocorona
if you like arc,but feel power is the only drawback,may i suggest you audition their new 300.2.all the arc sound,but with conservatively rated 300w into 8ohm,500w into 4ohm.too further enhance sound and perceived power,use anaconda alpha power chord from shunyata.this chord also will help power problem if yo go for a tube amp.
Good point RMDH. Have you compared ARC 300.2 with Rowland 501 monoblocks? Excellent idea about Shunyata Anaconda. I have tried this chord at Andy Singer's shoppe in N.Y. recently and I am totally sold on it.
I've had all three makes of amps. I am quite happy with the sound of PASS Lab Aleph 1.2 amps. Very tubey and warm sounding for solid state. Great dynamics with a midrange is the best I've heard in all my many years of listening.
Mfslgold, I'd love to heed your advice, if I were not addicted to MagnePan, that regretably are such unrepentant juice guzzlers.
Could I ask you to comment on the sonic characteristics of the Rowland(s) and ARC(s) that you owned? Thanks, Guido
Rowlands were too colored and washed out (Rowland 7 series 3 mono blocks). ANd the Audio Research Classic 150's had little detail in the mids and sloppy bass. The Pass Aleph 1.2's have the best of both worlds . Great detail , superb natural midrange and accurate bass dynamic. (Bass is not your typical slam solid state bass) but very defined and exteneded.