Quad 988 mod review


I just had the Quad 988's modded by Kent McCollum of Electrostatic Solutions. He swapped out the factory input electrolytic cap for North Creek Zen film caps and Sonicap bypass caps. Along with a few other things.

I had mentioned to him before the upgrades, I felt like the mids were lacking. Especially noticeable when listening to female vocalists when singing with a band. The instruments would drown out her voice (an exaggeration of course), like her mic was turned way down.

Now. The female vocalist has been brought forward on the stage and is part of the band rather behind. Major improvement and very noticeable. Her voice is natural now, in balance and tone.

Overall, instruments are more focused and clearer. I can hear more of the overtones from acoustic strings. Very natural -- closet to the real thing I have heard from my system.

Highs are very articulate now also. Cymbals are crisper and really ring naturally.

Horns are incredibly focused and accurate. Its amazing the depth of the overtones heard from brass and woodwinds.

Its like I'm listening to a whole new system -- I'm really stunned at how major the improvements are
grateful

Showing 1 response by johnsonwu

I did a similar upgrade myself to repair my 989s whch have become very senstive to treble transients (it shuts down)
I ended up having to replace the evil bendix lytic with film caps, bypassing the FS2, upgrading the input R to Mills 12W 1.5 Ohm, the transformer resistors with Caddock,
and most importantly the small 1.5uF cap between the 4 resistors with a film cap.
I have had no luck with cap bypassing so far.
bypassing one cap with a different brand always gets me phase problems (moving violins and vocals shifting forwards and backwards.
This mod is essential to do these quads justice.