[Jrunr]

Hey guys,



Well, I can now see why I am not happy with my Sub output from my HSU ULS-15 in my room. Here are the measurements I took:

I switched the phase on this one per [email protected], but not much difference...

With the receiver crossed over at 60hz, the sub just cant keep up with my mains. As a matter of fact, they are WAAAY down! I switched the crossover to 40hz, and the same thing happened, only the sound fell of at 40hz this time.

This is crazy. Please help!

 

[sivadselim]



Those are graphs of the sub, alone, or the speakers plus sub? If speakers plus sub, it looks like your sub is not calibrated to a high enough level. Or even ON.

 

[cschang]

Yeah...that does not look good at all. The phase change did make a big difference. It does look like it is the mains and the subwoofer.


What is the ULF trim setting on the sub? Have you tried the sub in different locations?

 

[sivadselim]

Jeez. It almost looks like that is the sub, alone, connected to the front channel pre-outs.

Something is not right, here. How did you calibrate the sub and speaker levels?

 

[Jrunr]

That is the speakers and the sub. The sub in different locations doesnt make a huge difference, and I am very limited to where i can place it. The otherlocations I put it in actually made less bass... figure that one out...


As far as the level, It just makes mechanical noise if I turn it upany higher. I can see the cone flapping and here the mechanical noise it makes, but it is not generating any sound.


Now, when I did this sweep at these levels, I got a lot of mechanical noise belowe 20hz... not good.

 

[spyboy]

This is for one sub? Don't you have another somewhere in transit?


Is it possible you are sitting in a null? That could make a vast difference. Did you try the crawl method? One way to find the best location for your sub.


Look at this for a comparison!!!

http://www.avsforum.com/avs-vb/showthread.php?t=1106466

 

[Jrunr]



Quote:
Originally Posted by spyboy /forum/post/15511433


This is for one sub? Don't you have another somewhere in transit?


Is it possible you are sitting in a null? That could make a vast difference. Did you try the crawl method? One way to find the best location for your sub.

Well, that other sub is still waiting to be built... frustrating...


Yes, i tried the crawl method, and my room is very strange... I think I am just going to place it elsewhere and take measurements, this way it will be more "scientific" per se...


I am just very frustrated here!

 

[croseiv]

Is your sub in the middle of your room???? Do you have it connected/set up right? Something is flat out wrong!

 

[Jrunr]



Quote:
Originally Posted by croseiv /forum/post/15511461


Is your sub in the middle of your room???? Do you have it connected/set up right? Something is flat out wrong!

It is in the front right "corner" against a wall....


it is hooked up wirelessly.

 

[spyboy]



Quote:
Originally Posted by Jrunr /forum/post/15511477


It is in the front right "corner" against a wall....


it is hooked up wirelessly.

Is the trim level set to 16?

 

[lennon_68]

Could you run a measurement of the sub only (set the crossover as high as you can on your AVR)? Also could you do measurements of only one sub at a time. Do you have any type of EQ available?

 

[Jrunr]

yep.

 

[bossobass]

Just a suggestion:


Make sure the ULF Trim knob is all the way to the left and the crossover knob is all the way to the right.


What measurement mic/sound card are you using?


Are you saying that you raised the level to the point of mechanical stress and 75dB is all you registered on the graph?


Bosso

 

[Jrunr]



Quote:
Originally Posted by lennon_68 /forum/post/15511512


Could you run a measurement of the sub only (set the crossover as high as you can on your AVR)? Also could you do measurements of only one sub at a time. Do you have any type of EQ available?

i only have one sub right now, but i will run the new test without speakers...

 

[spyboy]



Quote:
Originally Posted by Jrunr /forum/post/15511515


yep.

yep to which post? trim level at 16?

 

[lennon_68]

It may be useful to do a close-mic sweep as well (3-6" from the cone) to see how bad the room is messing things up.

 

[Jrunr]



Quote:
Originally Posted by spyboy /forum/post/15511541


yep to which post? trim level at 16?

yes

 

[Jrunr]

Ok, here is an interesting tid-bit of information, I unplugged the wirelss adapter and plugged it in hard wire, and I got new readings... I will post the ones with out the speakers, and the ones with... give me a few minutes to upload them.

 

[Jrunr]

Ok, here is the curve with my crossover set to 120hz, and the speakers disconnected:


....

And here is the curve with the crossover set to 80hz an my speakers playing as well.

I am not sure what this has to do with the wireless, but the measurement still looks alot better...

 

[lennon_68]

Well that's a bit better