For more info regarding the difference
between the J2 & F7 (and the Pass SIT-1 mono blocks), check out John Richardson's Part Time Audiophile write up on all three amps with 3 different
loudspeakers including Zu's Druid Mk. V, ATC's SCM 19 version 2 and my
own Fritz Carbon 7SE's.
https://parttimeaudiophile.com/2016/09/09/review-j2-sit-1-and-f7-first-watt-amplifiers-by-nelson-pas...
Also, check out the Stereophile review by Herb Reichert of the J2 with half a dozen loudspeakers at http://www.stereophile.com/content/first-watt-j2-power-amplifier#mEgFspqof6P0VdkH.99
https://parttimeaudiophile.com/2016/09/09/review-j2-sit-1-and-f7-first-watt-amplifiers-by-nelson-pas...
Also, check out the Stereophile review by Herb Reichert of the J2 with half a dozen loudspeakers at http://www.stereophile.com/content/first-watt-j2-power-amplifier#mEgFspqof6P0VdkH.99