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  #1  
Old February 7th, 2014, 5:04 AM
suzook1 suzook1 is offline
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mixing subs

Hi all

I have a ULS-15 which I finally got set up... LOVE IT. MY plan is to add a second later on when I have funds.

The question is, for now can I mix subs or is it not recommended. I have another sub that still performs fairly well and was going to add it to the mix.

any comments?
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  #2  
Old February 11th, 2014, 6:46 AM
suzook1 suzook1 is offline
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anyone

care to comment
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  #3  
Old February 11th, 2014, 7:40 AM
pr@j pr@j is offline
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Well, there are probably a few things to consider before doing this - in theory there is nothing WRONG with mixing subs, more a matter of your personal preferences and tastes.

1. Make sure that your A/V receiver can handle the load placed on it with the additional sub - this includes, the impedance rating of the subs combined. Are both subs powered by their own built in amplifier? Does your current receiver have 2 subwoofer outputs, if not, how will the 2nd sub get a signal - this is important to avoid overloading your receiver.

2. Crossover frequencies for both subs will play a part in the final experience/result you get

3. Power handling, if 1 sub is substantially more powerful than the other, you may not necessarily gain a huge increase in SPL

4. You could use 1 sub for mid-bass and the other for lower end, allowing more headroom for each sub, and the overall quality of your bass could improve.

That said, you won't know until you try it.
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Old February 11th, 2014, 8:21 AM
elwaylite elwaylite is offline
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I went thru this recently, and after the research I decided to go with a second VTF15h.

After running Audyssey XT32 with dual sub eq, this thing sounds great. Id just get a second ULS-15.
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  #5  
Old February 11th, 2014, 6:44 PM
SteveO SteveO is offline
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Quote:
Originally Posted by elwaylite View Post
I went thru this recently, and after the research I decided to go with a second VTF15h.

After running Audyssey XT32 with dual sub eq, this thing sounds great. Id just get a second ULS-15.
I am thinking about updating my receiver to one that has Audyssey XT32 with dual sub eq and the x4000 is at the top of my list and I see thats what you have.
Would you recomend this receiver? Now that I have dual VTF15h's I am wondering if this would be a noticble improvment over a 5 year old unit.
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  #6  
Old February 12th, 2014, 9:44 AM
suzook1 suzook1 is offline
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I have an Onkyo 5010 so it should be able to handle the 2 subs. The second sub is merely a stop gap for a few months until I can get the wife to not notice and new sub coming through the door
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  #7  
Old February 13th, 2014, 10:31 AM
elwaylite elwaylite is offline
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If the 5010 has dual sub EQ, Id not worry about the X4000. XT32 and dual sub eq did a great job with dual VTF15's IMO.
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  #8  
Old May 1st, 2014, 1:14 PM
SME SME is offline
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Quote:
Originally Posted by SteveO View Post
I am thinking about updating my receiver to one that has Audyssey XT32 with dual sub eq and the x4000 is at the top of my list and I see thats what you have.
Would you recomend this receiver? Now that I have dual VTF15h's I am wondering if this would be a noticble improvment over a 5 year old unit.
I have mixed feelings about the dual sub capability in Audyssey XT32. On the plus side, the auto-setup will time align the two subs for you. This is very helpful if the subs are at different distances from the main listening position. On the minus side, the auto-setup level-matches instead of gain-matches the two subs. Depending on your configuration, this can substantially limit your headroom.

Another more serious concern is that the auto-setup may sometimes get the distances wrong. I have witnessed this problem with Audyssey MultEQ XT when calibrating multiple subs on a single sub output, but I can work around it by measuring and changing the distance after the auto-setup. This works because the EQ correction is not sensitive to the detected distance for a single sub. With two subs, however, the EQ correction *is* sensitive to the relative distances detected because it corrects the time-aligned subs as one.

That said, I understand that MultEQ XT32 has much better filter resolution than MultEQ XT, so upgrading is probably still well worth it. But keep in mind that, depending on your setup, it may be better to gain match the subs and then run auto-setup with the subs hooked up to one sub-out via a Y-adapter rather than relying on the dual sub EQ.
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  #9  
Old May 1st, 2014, 1:00 PM
SME SME is offline
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Originally Posted by suzook1 View Post
Hi all

I have a ULS-15 which I finally got set up... LOVE IT. MY plan is to add a second later on when I have funds.

The question is, for now can I mix subs or is it not recommended. I have another sub that still performs fairly well and was going to add it to the mix.

any comments?
Unless the subs are both the same model, mixing subs is generally not recommended. There are two problems you may encounter with different subs. First, when properly gain matched, one sub will likely be much so much louder than the other that the other doesn't contribute much. A potentially bigger problem is that the two subs may have different phase responses and may interfere with each other at some frequencies.

As others have suggested, your best option is to purchase another ULS-15.
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