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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
tweakyman OP
21 posts
 
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....
tweakyman OP
21 posts
 
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.
tweakyman OP
21 posts
 
Thanks Stanwal.
I'm sure your absolutely right but the sound is clearly superior to me than either single pair on their own.
I have tried all my front ends using reference material that I am very familiar with. As a musician I am very conscious of timbrel accuracy and the quality of the sound of acoustic instruments.
This set up shouldn't work and yet it's a huge improvement
I'm hearing nuance and subtle dimensional stuff I've never heard on these recordings before. I make no argument as to your point this "cannot be accurate" but it does sound good. Now if I could only get rid of the hum..
tweakyman OP
21 posts
 
Hi Manoterror.
I really enjoy the improvement. The stage is Huge and better defined. There is more detail right across the board. The rendering of drums in acoustic jazz is particularly exciting. With orchestral stuff it just feels more powerful and real. I'm hearing deeper into the sound stage than before..
According to Stanwal's comments, you may well get even better
results seeing as you have two sets of identical speakers. I wish you good luck with this and hope you don't get an annoying hum
reylon
47 posts
 
I sold my Moscode 600 when I saw that I was unable to contend with its high level of hum,which got much worse when reconnecting after it was not used for a year.
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