Then posted inside the Setting Up Your Home Theater 101 thread July-20-2011, http://www.avsforum.com/avs-vb/showt...8#post20720828
and I realize that is a FAQ thread, not a discussion thread, so I re-post it here for open discussion/dialoge/understanding.
This is a re-post from the original Paradigm owners thread.
I'll edit the Setting Up Your Home Theater 101 to not clutter that FAQ thread. 7.1 set-up of dipole surrounds (ADP-390) phase question
The Setting Up Your Home Theater Audio 101 has threads under Speaker Layout.
One I'd like to discuss is the "Bob Golds, Sanjay Durani - Dipole Surround Placement" link.
Please read my 2 post below that originated in the Paradigm owners thread but got zero feedback.
If the thinking Bob Golds & Sanjay Durani presented has changed that link content should be modified or removed if its no longer the best practice on using dipole in 7.1 set-up.
|Audioholics - Speaker Spikes and Cones – What’s the point?
Audioholics - Vertical vs Horizontal Center Speaker Designs
Bob Golds, Sanjay Durani - Dipole Surround Placement Dolby Speaker and Room Setup
DTS - Where Should I Place My Speakers?
Loudspeakers and Rooms for Multichannel Audio Reproduction, Part 1 by Floyd E. Toole from Harman
7.1 set-up of dipole surrounds (ADP-390) phase question
When I run audyssey it comes back saying my LH surrounds are out of phase....I have the + and - correctly connected on back Amp<>Speaker each of the 4, so I ignore it.
Now, as I have gained more insight into acoustics I questioned the side surrounds in/out of phase vs the back wall rear surrounds in/out of phase.
My HT layout and speakers are shown below.
Then, I come across this diagram from
which makes sense, the nulls are in the middle for the side walls, yet on the back wall with both on same wall they don't cancel each other between the speakers.
Guys, I'm not sure mine are wired like this...and when I look at the Paradigm website and the owners manual for the ADP-390's no where does it mention this....
How have others here with ADP-390's in their 7.1 set-up handled this?
Maybe the Paradigm owners thread is the wrong place to discuss this?
Or, it's been discussed before and the "same" conclusions are reached...
Doing a search here on "dipole phase" there are some threads, mostly older, that have discussed this, here are some I found, all are 1 page thread except the one noted:
Do dipole surrounds come with Left and Right option?
Dipole vs Bipole
Bi-pole vs di-pole vs standard for surrounds
10 page thread: DIPOLE and BIPOLE SURROUND SPEAKER THREAD
Per this article, are my Paradigm dipoles (ADP 590s) lame?
Dipole phase question
I also modified just the the woofer driver polarity inside, so when I switched the main wire polarity going into the surround the woofer polarity was in correct phase with all the others, "+" as it points at each other / next to.
picts of re-wiring, actually easy to do.
Before clearly woofer is "+' in phase, I swapped the wires here, Red now goes to "-" and Black to "+".
Crossover board layout, I did NOT do anything here
Labeled the Back RH surround and LS Side surround as "modified":
By doing this I simply matched what a LH/RH hard wired from factory or a switch does.
Circled on RED are now modified as shown, woofer's are all "+" phase.
Can I hear diff?
I got this done last night 10pm-ish and went to bed, I'll have to go thru my demo material.
Best would be if I had 2 more ADP-390's and could do a/b comparison....the dealer I bought these from, AVIO in Brighton, closed their store 8 months ago and only their Troy store is open, I had good repore with them and could have borrowed a set for weekend.
Anybody in SE Michigan with ADP-390's want to do some A/B comparison of dipole surrounds?
Note: Definitely I can hear marked difference with the ADP-390's wired like I show in the picture.
More diffuse sound, but it also appear simply more sound, even more discrete sound than before.
Is it the placebo effect or do I really hear "more sound"?
I like the change and won't go back.
As stated, I'd really like to borrow (2) more stock ADP-390's to do a/b comparison.
Have others done that already?