13 replies to this topic

[mmu16]

Hello all,

Need some input from the learned folks at DTV on dual subwoofer setup.  I have 2 X Paradigm DSP 3400's (Thanks nickowns )  in a dedicated HTroom which I'm currently setting up. I'm planning on running the subs in a fore/aft diagonal config (front right, back left).  Now the user manual for the Paradigms have provided instructions on how to 'tune' both subs in this config (level/gain/phase configuration in good detail, including positioning) to obtain the best Bass response.  

My question is twofold -

1) Do i set up the subs first and then get the receiver (Yamaha) to run the YPAO set up or vice versa?

2) Would the config provided by the receiver (instructed to open up crossover to max and vol to 1/3 on both subs prior to running YPAO) be better than the config provided by the subs?

Bit flummoxed by all of this..appreciate your response.

Ta

mmu16

P.S - speaker set up is 7.2 btw

[:)]

what need to check and I dont have the answer for this. but whether the yam avr will eq, and setup each sub for phase, delay and level ? otherwise it is likely F'up all the good work done in the setup you already have unfortunately.

I would be tempted to run without the yam eq and see what its like just how you have things setup

also re subs, check the harman white paper re sub locations, best is usually front and rear middle.

http://www.harman.co...rs/multsubs.pdf

worth also trying that in your room.

if cant discretely setup the subs, also worth trying subs up front L&R co - located next to your mains

[MarkTecher]

I think you will find that it will treat the Subs as if there is one.  It may reverse the polarity if one of the subs was positioned along a side wall firing across the room.  overall, you want the two subs to 'interact' so that ones peaks offsets the others dips and vice versa.  I would run the Auto Cal first, then check the levels and phase.  What I would not do though is have the subs adjusted to 2 different levels.  The idea here is to load  the room as evenly as possible so want both at the same level and then set the overall level.

[mmu16]

Thanks for the input guys.  The receiver treats both subs individually (not the same signal replicated through 2 line outs) so looks like I have to try out both setups to see which works better. Will keep you all posted!

[brabs]

The best spot to give you the flattest overall response, would be 1/4 in on the front wall and 1/4 in on the back wall, but opposite sides, this will eliminate many of the room modes, there is a way to eliminate them all but will result in a lower output.

[Chicken Man]

:), on 10 February 2012 - 05:37 PM, said:

what need to check and I dont have the answer for this. but whether the yam avr will eq, and setup each sub for phase, delay and level ? otherwise it is likely F'up all the good work done in the setup you already have unfortunately.

I would be tempted to run without the yam eq and see what its like just how you have things setup

also re subs, check the harman white paper re sub locations, best is usually front and rear middle.

http://www.harman.co...rs/multsubs.pdf

worth also trying that in your room.

if cant discretely setup the subs, also worth trying subs up front L&R co - located next to your mains

Al,  That's a very interesting .PDF

The best I can do is to fit two subs under the projection screen as the seating for my HT room is against the rear wall.

Of course the answer to it all is to live in a paper walled house or even a hay walled house with a few surrounding acres.

C.M

[:)]

Chicken Man, on 12 February 2012 - 12:19 PM, said:

Al,  That's a very interesting .PDF

The best I can do is to fit two subs under the projection screen as the seating for my HT room is against the rear wall.

Of course the answer to it all is to live in a paper walled house or even a hay walled house with a few surrounding acres.

C.M

can achieve a good result in that arrangement CM and is what I run. I could potentially run one sub up the back as per the harman paper too. but look we do what we can within available means isnt it. And pretty happy with the result something content with.

ps benefit of the arrangement you describe is that both subs end up symetrically placed and  delay, phase and level consequently is much easier to get right than the front back arrangment.

[SDL]

Likewise mine are both at the front under the screen and seem to work well.

[craigandkim]

Placement is crucial to achieving best bass response, I have finally got around to moving my subs around and re-measuring.

First new placement- 1/4 distance along the front wall.... yieldied quite a remarkable change as the graph shows with the response over 10-125hz range

http://www.dtvforum....showtopic=99532

[Drizt]

craigandkim, on 12 February 2012 - 08:14 PM, said:

Placement is crucial to achieving best bass response, I have finally got around to moving my subs around and re-measuring.

First new placement- 1/4 distance along the front wall.... yieldied quite a remarkable change as the graph shows with the response over 10-125hz range

http://www.dtvforum....showtopic=99532

Exactly right.  If you are able to move the subs around and take plenty of measurements you will potentially get a lot more out of your subs than if you just plonk them down.

[ajm]

The optimal position depends on the size of the room and the desired seating position. There are some tools that will help you identify where these spots should be in the room.  But if they're not huge or you have a friend who can help shift them, then a bit of trial an error should get you a decent result.

[mmu16]

well my room is 6m X 4m X 3.3m. The front/rear diagonal position is recommended by Paradigm as well (sub instruction manual) and is possible in my room.  however the front left/right solution wont work for me since the room door gets in the way.  I have been testing the set ups and so far setting up the subs using Paradigm's recommendations and then running YPAO seems to give better overall sound quality (music + movie). However, using the receiver's settings on the subs and running YPAO seem to be better for movies but worse for music.

The receiver manual requires me to set the sub volume at 1/3 and crank the crossover to maximum on both subs.

Subwoofer manual requires me to do sub placements and marking high/low areas and then putting one sub on a 'high bass' area and the other sub on a 'low bass' area (diagonal - front & back) with phase set to 180.

[MarkTecher]

If the AVR can do the job, then let it do its thing.  If you must calibrate each individually, then calibrate one at a time by setting LCR and surrounds to +75dB, then setting SW '1' to 6db lower (lowest point of needle swing would be 69dB).  Repeat the proceedure with SW '2'.  Their combined output will be the correct level.

[Blackwash]

Which Yamaha do you have? Some treat bass EQ differently.