Two pairs of spkrs in tandem


I need the help of the technically minded and capable folks on this great audiophile panel.
I am running B&W original 80 series 802's as my primary spkrs. rated at at 8 ohms..... tweaked..re-wired and all inards hard wired, soldered with cardas, great solid copper binding posts & Sand filled and tensionized side dampers to control box resonance in this (pre- matrix) design.

I have attempted to intigrate my other pair of favorite spkrs, 1996 Sound Dynamics 300ti's rated at 4 ohms, with their propietary titanium dome tweeters and run them in tandem with my 802's

In principal they have added a great deal in capturing subtle detail as well as in specificity and depth in the sound stage, most certainly in (over-all) dynamics and clarity

Basically "I love the sound" the 300 ti's seem to add that extra level of transparancy, reveal and crispness that the the B&W's didn't quite capture on their own...

THE SNAG however is a low level HUMmmmm!!!! coming from the Sound dynamic spkrs......

Mine is a complex set-up.... featuring A stereo pair of Janis SUB WOOFERS crossed over at 100 HZ and powered with their own dedicated W3 100 watt JANIS AMPS..

Also a pair of TOWNSHEND "super tweeters" connected to the B&W's

I built a (glued & screwed) MDF coupling that positions and holds the the 300 ti's upside down (forming a 6 foot high 9 driver (per side)"array" tweeter to tweeter assembley.. COOOL!!!

THE WHOLE THING IS A TERRIFIC REVALATION FOR ME!!!!! EXCEPT FOR THE ANNOYING HUMmmmmm!..

I've checked and re-checked the integrity of all connections to no avail...

If I re-move the 300ti's.. the hum is gone???...

IS it the B&W 8ohm Vs the ti's 4ohm mix??. Is that creating some kind of dichotomy causing the hum in my otherwise silent set_up ?...

I would love some help on this.... THANKS..
tweakyman
I didn't know Phil Spector was out of jail. The "wall of sound" approach has been tried many times, it will work to some degree with 2 pairs of identical speakers but using dissimilar speakers will result in a sound you may find pleasing but cannot be accurate.
I've been contemplating doing the same thing with 2 pair of matching Anthony Gallo A'Divas. Kind of a poor man's Reference Strada since I can't hear above 18khz anyways. :-) Although I am thinking of just running them on both A and B speaker outputs.

How did it work out for you? What was the sonic improvements you heard?
"Although I am thinking of just running them on both A and B speaker outputs. " Why? It is the same amp anyway.

Kal
Kr4. Thanks Kal.
I ran a pair of short speaker cables, bannana plugs on each end from the B&W's terminals up to the ti300's. I also tried to run the added speaker cable out of the Moscode 600 amps terminals where the B&W's are connected, but that did not eliminate the hum....
Thanks HiFihvn.
I'm running the speakers out of my NYAL Moscode 600.

As the Subs have their own 100 Watt dedicated amps and are crossed over at 100hz there doesn't seem to be overt pressure on the Moscode, although it does seem to run a bit warmer than usual with this 2 spkr set up.