Hi Guy,
I'm not sure what impedance the A23 shows the SPU (someone would need to measure it), but it certainly gives more output than using the A23 for the 103 does with the SPU, but it's the way it voices music reproduced that's just utterly stunning!!
Keith Aschenbrenner really does have a great ear for this kind of stuff.....
There's a bounce and 'impetus' to the way the SPU now handles rhythms, underpinned by serious visceral heft and a lovely top-end clarity, which drives music along with a rather infectious flow, simply putting a big smile on your face. Make no mistake, the SPU/A23 (SPU) maxes out the fun-factor in music.
Jeez, this is an infectious listen! :eek:
You really must get one for your 12" Jelco, as trust me, with the right SUT you'd L O V E it, mate!
Marco.

