REW/1124 Two Subwoofers - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 4 Old 11-06-10, 09:53 AM Thread Starter
Shackster
 
Join Date: Nov 2010
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REW/1124 Two Subwoofers

Just getting ready to start using REW with my new 1124. I have two subwoofers, and I need some help on how best to implement them with my system using REW. Should I initally start with the 1124 set to couple the two together, or should I set them up separately on the left and right channel?

I am new to REW and 1124, so just trying to learn the best route to success!
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post #2 of 4 Old 11-06-10, 12:47 PM
Shackster
 
Join Date: Aug 2010
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Re: REW/1124 Two Subwoofers

There are several approaches, and what works best sometimes depends on luck, and whether you have identical model SWs or two different models:

1. Optimize location and EQ response for just one. Optimize location for just the other, and see if the EQ response works well. If not, consider doing EQ/response for the second, and find a new location for the first. Then measure for both and tweak.

2. Optimize location for first one, then add the second. Adjust the location of the second for optimal smooth room response. If you have a symmetrical room, the position will probably be symmetrical. Then EQ for the combined response.

3. If the subs are identical, you might want to consider co-location (stacked or whatever) for maximum SPL - but your room response will not likely be as even for the seating positions. So find the best location for just one, put the second one one top, and adjust EQ for frequency response.

I got lucky: the optimal position for one was not the same for two (symmetrical positions) when I added my second (identical) SW, but it turned out by placing the SWs where I wanted them for aesthetic reasons was also a great place for getting a very flat FR - or a well-behaved house curve (which is what I am using now, mostly).

Are your SWs two of the same, or are you mixing models?

shinksma
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post #3 of 4 Old 11-06-10, 12:57 PM
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Matt
 
Join Date: Sep 2008
Location: Virginia
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Re: REW/1124 Two Subwoofers

I see shinksma already gave excellent advice...

This is what I was slowly typing.

I'm assuming from another thread that both subs are the same M&K model in opposite front corners. You can disable any EQ and play around with placement to see how moving them affects the response. If you've already done that and are happy with the results, coupling the BFD channels and applying a common EQ filter to both subs will be easiest. Treat them as a single unit. Then redo the level matching with the main speakers.

Don't forget to post the response graphs and waterfalls for us to see!

Matt
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post #4 of 4 Old 11-06-10, 01:06 PM
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Re: REW/1124 Two Subwoofers

Ah yes, I just responded in that other thread, and indeed if identical models, and symmetrical (non-co-located) positioning is desired, then I would suggest you try option 2 - although you may find it easier to try another option I forgot to describe, similar to option 2:

4. Often a symmetrical placement (either front-back or left-right) is a pretty good place to start, especially in symmetrical rooms. So start with the SWs placed symmetrically (say, in the corners) and measure room response. Then adjust positions (symmetrically) by moving them closer together or along the side walls, and re-measure room response. Once you find something "reasonable", adjust the EQ.

Good luck!

shinksma
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