Can Room Correction Be Added to an Existing DAC?

The original stacked quads were in a stand made by Mark Levinson. There was a Decca ribbon tweeter between the two and the system used 30" Hartley woofers. It used 6 ML 20 watt class A amplifiers. I think they were John Curl designs. The Preamp certainly was.
The Quad 63 does not have side plates. The best way to do this would be to turn the second speaker upside down and place it on top. You will have to fashion a bracket between the two and hopefully the whole mess will balance on #1's stand. You will need a cross over with a high pass filter and I would recommend crossing over at 120 Hz. You will need at least two subwoofers. I use 4. With a full function cross over you can use passive subs with an outboard amp. Fun! The Quads start rolling off at 
10K. They are 5 dB down by 20 K. You can fix this with room control.

gosta, I certainly agree. I have been using a TACT unit for 25 years. I have ESLs and subwoofers. Once you hear a system with full digital correction there is no turning back.

Mahler123, the answer is yes sort of. If you just use two speakers you can use a DAC after a room control unit by taking a digital output. The problem comes when using sub woofers. Now you need two 2 channel DACs. The good room control units allow tailoring the entire frequency band including and probably most importantly the bass. They include bass management software which gives you the best subwoofer integration possible. Units Such as the Anthem STR, DEQX and the Trinnov Amethyst include 4 DAC channels. IMHO a complete unit is the best way to go. If you do not use subwoofers and have a DAC there are certainly less expensive ways to go but, warning, bass can deviate +- 10 dB. Correcting this requires a speaker of massive power handling and a very powerful amp. You can deal with this by going into the program and reversing some of the correction to keep yourself from clipping amps and blown speakers.