Home Theater Forum and Systems banner

1 - 20 of 20 Posts

·
Registered
Joined
·
57 Posts
Discussion Starter #1
I have a DSP1124P under my tree with my name on it. :bigsmile:

But before I play with it I wanted the best non-equalized position for my sub as a starting point. For these two graphs I'm running a single notch filter at 25hz -10db to tame a hump that would otherwise be present. The X-Over is set to 80hz at the processor

What position do you prefer? A or B. I know it can be subjective, I'm just curious what someone else might think.

 

·
Registered
Joined
·
1,405 Posts
Re: Which Sub Position Do You Like?

How did you know it's under the tree did you put it there? Just curious. B looks best and the dip isn't in the 40Hz area so looks good to me.
 

·
Premium Member
Joined
·
308 Posts
Re: Which Sub Position Do You Like?

Hello, try changing the phase on your sub to see if you have some improvement. If you do not have a phase control, you can change de delay or distance on your receiver. Just 1 foot increment could have an impact.

what will be your crossover frequency ? Are you going to use a Housecurve ? Have you check it with your mains ?

Many questions before using your EQ !
 

·
Registered
Joined
·
7,514 Posts
Re: Which Sub Position Do You Like?

Yeah, choose A and get rid of the dip at 66Hz with the phase control.........

brucek
 

·
Registered
Joined
·
57 Posts
Discussion Starter #6
Re: Which Sub Position Do You Like?

How did you know it's under the tree did you put it there? Just curious.
Yes :R My wife and I pick out most of our presents too each other that way everyone is happy and no returns.

imbeaujp said:
Hello, try changing the phase on your sub to see if you have some improvement. If you do not have a phase control, you can change de delay or distance on your receiver. Just 1 foot increment could have an impact.
I never thought to use the phase control :duh: I'll adjust it at the processor that way I can adjust in discrete increments. Now that will have an impact at the cross over point right? Is there anything to be on the watch for?

imbeaujp said:
what will be your crossover frequency ? Are you going to use a Housecurve ? Have you check it with your mains ?
I'm crossing over all speakers at 80hz.

I find my self boosting the sub especially with music. A true flat response seems dull. Eventually I'll use a house curve when I get more proficient at this stuff.

I do have sweeps with the mains included. But I thought the general rule of thumb was to position and equalize the sub first then add in the mains and perform some final tweaks.
 

·
Registered
Joined
·
7,514 Posts
Re: Which Sub Position Do You Like?

I never thought to use the phase control I'll adjust it at the processor
Use the subs phase control first. If that's not successful, then use the sub distance control. (remember the phase control only has an effect once the mains are added)

But I thought the general rule of thumb was to position and equalize the sub first then add in the mains and perform some final tweaks.
Correct, but you've done all you can with the sub and you have a dip right at the crossover. Add the mains and use the phase control to remove the problem.

brucek
 

·
Registered
Joined
·
7,514 Posts
Re: Which Sub Position Do You Like?

Is there reason to adjust the phase at the sub rather than through the processor (pre-amp)?
The result is generally the same. Sometimes it may be easier to adjust the subs phase dial.
I find it easiest to adjust to adjust the subs phase dial in real time by using the RTA feature of REW while watching the computer screen. I can tell you how to set that up if you have trouble...

brucek
 

·
Registered
Joined
·
57 Posts
Discussion Starter #13
Re: Which Sub Position Do You Like?

Wayne,

The crossover is set to 80hz at the processor. The sub crossover is set to max, 150hz I believe. I'm assuming the processor crossover will assert control.

Not to change the subject, but why is 80hz the THX recomended/setting for the crossover point?

Would it not make sense to increase the crossover point so I can benefit from EQ'ing over a larger frequency range with the DSP1124p?

Anthony
 

·
Registered
Joined
·
7,514 Posts
Re: Which Sub Position Do You Like?

Not to change the subject, but why is 80Hz the THX recomended/setting for the crossover point?

Would it not make sense to increase the crossover point so I can benefit from EQ'ing over a larger frequency range with the DSP1124p?
Over 80Hz, the subwoofer become localizable - something you don't want.

Is this the expected level of change from a phase adjust of the sub?
A phase control can have anywhere from no effect to a very large effect, and over a fairly wide range.

The phase control is certainly having a effect between 50-60Hz in your graph.

brucek
 

·
Premium Member
Joined
·
308 Posts
Re: Which Sub Position Do You Like?

I think you have a better result with 20 degree phase alignement in the 40-60 hz range. It is a nice boost without using any EQ !

Could you post the graph (20 degree) alone just to check it again ?

It is not too bad at all, in my system the crossover frequency is set to 60hz. My mains have large woofers, 12 inches, so I prefer to let them go in that area.
 

·
Registered
Joined
·
3,251 Posts
Re: Which Sub Position Do You Like?

The crossover is set to 80hz at the processor. The sub crossover is set to max, 150hz I believe. I'm assuming the processor crossover will assert control.
What speakers are you using??? ...Are you using them as small??? ...Did you try different crossover frequencies???
 

·
Registered
Joined
·
57 Posts
Discussion Starter #17
Re: Which Sub Position Do You Like?

The speakers are Paradigm Studio 100's Servo15 sub. The speakers are set to large. I haven't tried any different crossover frequency yet.

 
1 - 20 of 20 Posts
Top