Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 247 - AVS Forum
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post #7381 of 12645 Old 12-12-2013, 09:37 AM
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Quote:
Originally Posted by Brian Fineberg View Post

could be a pretty good guess. the ceiling being the more of the two...I do have a very thick shaggy carpet on the floor but it might not fully cover the reflection.

and before everyone starts saying how I need to move it out of the corner yaddy yaddy yada...I am well aware the placement of the entire thing isnt ideal..but its what I have for the next 2 years or so...until we relocate (due to increasing size of family in may biggrin.gif) so I am trying to get the best response out of what I am dealt with ...ya dig?

EDIT: it could be an audyssey problem (mic placement) because before adding the second sub (and thus re reunning audyssey) my response +100hz wasnt as bad...as you can see in this graph

I think I have that exact carpet. Walmart special? By itself, that carpet is useless in the range of frequencies we are concerned with. In my experience, and in my room, I have/had 3-4 carpets of that type on top of each other and it barely deals with 1K sufficiently, much less 100-350hz.

If you cant move out of that left corner, you could put treatment there (4" OC703 or equivalent on that adjacent wall).

If you use sliced ETC's, you can gain insight to the frequency content of a given bounce.

Also keep in mind, especially when considering floor bounce, that blocking or redirecting the bounce is often as effective as trying to absorb it.

edit: at what frequency range are your subs operating? (yes, the before plot does look better).

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post #7382 of 12645 Old 12-12-2013, 09:42 AM
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Originally Posted by Selden Ball View Post

You might want to consider heavy drapes for the windows instead of light-weight curtains. Drapes will help to reduce the audio reflections on that side and the light reflections off the TV's screen.

just an fyi those are actually heavy weight blacked out drapes..not light curtains...I have run ETA and they make a HUGE dent (bring that reflection to almost -20 ) in the first reflection point

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post #7383 of 12645 Old 12-12-2013, 10:44 AM
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I have my center on a shelf under the TV and over a cabinet. Nearfield (at most 2-3 feet) it sounds good to me but at the MLP it sounds a bit boomy. What are the possible causes of that?

Putting some dampening material under the center helped a little as well as pulling the cabinet out a few inches and putting some 2"x2'x2' foam between the cabinet and the wall.

Besides continuing to fill that crevice with absorption what else could I do?
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post #7384 of 12645 Old 12-12-2013, 10:48 AM
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Originally Posted by artur9 View Post

I have my center on a shelf under the TV and over a cabinet. Nearfield (at most 2-3 feet) it sounds good to me but at the MLP it sounds a bit boomy. What are the possible causes of that?

Putting some dampening material under the center helped a little as well as pulling the cabinet out a few inches and putting some 2"x2'x2' foam between the cabinet and the wall.

Besides continuing to fill that crevice with absorption what else could I do?

Pic?

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post #7385 of 12645 Old 12-12-2013, 11:18 AM
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"Boomy" suggests to me that the high frequencies might be having problems. Make sure that the speaker is tilted so its tweeter points toward ear-height at the primary listening position.

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post #7386 of 12645 Old 12-12-2013, 11:21 AM
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Quote:
Originally Posted by artur9 View Post

I have my center on a shelf under the TV and over a cabinet. Nearfield (at most 2-3 feet) it sounds good to me but at the MLP it sounds a bit boomy. What are the possible causes of that?

Putting some dampening material under the center helped a little as well as pulling the cabinet out a few inches and putting some 2"x2'x2' foam between the cabinet and the wall.

Besides continuing to fill that crevice with absorption what else could I do?

I had a similar situation, and I pulled the center speaker off of the shelf and placed it on a speaker stand (http://www.sanus.com/ap/en/products/speaker-foundations/sp-steel/SFC22). The improvement was significant. You can see a picture in the My Setup link in my signature.
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post #7387 of 12645 Old 12-12-2013, 11:24 AM
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Originally Posted by jim19611961 View Post

Pic?

From a posting elsewhere. The shelf I mean is the one with DVDs and a phone on it. For a while I was using a phantom but then I discovered that some things are mixed assuming a center and my prepro wasn't compensating correctly (e.g. STTOS on netflix).

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post #7388 of 12645 Old 12-12-2013, 11:28 AM
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Quote:
Originally Posted by AustinJerry View Post

I had a similar situation, and I pulled the center speaker off of the shelf and placed it on a speaker stand (http://www.sanus.com/ap/en/products/speaker-foundations/sp-steel/SFC22). The improvement was significant. You can see a picture in the My Setup link in my signature.

I did the same thing, but not the same stand. In between the shelf and the stand, I also tried floor placement. Not awful, but way too awkward to angle it upwards so much, and hard on the ankles...
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post #7389 of 12645 Old 12-12-2013, 11:29 AM
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Quote:
Originally Posted by AustinJerry View Post

I had a similar situation, and I pulled the center speaker off of the shelf and placed it on a speaker stand (http://www.sanus.com/ap/en/products/speaker-foundations/sp-steel/SFC22). The improvement was significant. You can see a picture in the My Setup link in my signature.

I think to do that I'd have to get rid of the whole cabinet underneath. My wife is rather fond of it.

I suspect the shelf I'm using may be too resonant for the purpose. Either that or the cavity formed between it and the cabinet/electronics is creating some resonance. I'm not certain as I don't know how to look for this phenomenon in REW.
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post #7390 of 12645 Old 12-12-2013, 11:31 AM
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Quote:
Originally Posted by Selden Ball View Post

"Boomy" suggests to me that the high frequencies might be having problems. Make sure that the speaker is tilted so its tweeter points toward ear-height at the primary listening position.

I think I did that. Could it be rear wall reflections?
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post #7391 of 12645 Old 12-12-2013, 11:40 AM
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Quote:
Originally Posted by artur9 View Post

From a posting elsewhere. The shelf I mean is the one with DVDs and a phone on it. For a while I was using a phantom but then I discovered that some things are mixed assuming a center and my prepro wasn't compensating correctly (e.g. STTOS on netflix).


Yes. The top of that shelve, the semi-enclosed area underneath it, and the cabinet in general may be creating unwanted effects.

I can only advise experimentation and measurement for no sure thing fix comes to mind.

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post #7392 of 12645 Old 12-12-2013, 02:24 PM
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Originally Posted by artur9 View Post

I think I did that. Could it be rear wall reflections?

You mean the front wall (wall behind the speakers)? http://www.genelec.com/learning-center/presentations-tutorials/flush-mounting/

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post #7393 of 12645 Old 12-12-2013, 08:26 PM
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latest graph duals w/ LR mains...much better response...apparantly i was nuetering the ability of subEQ in the x4000 by how I had the minidsp setup:


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post #7394 of 12645 Old 12-12-2013, 08:36 PM
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Originally Posted by markus767 View Post

You mean the front wall (wall behind the speakers)? http://www.genelec.com/learning-center/presentations-tutorials/flush-mounting/

Yeah, I had wanted to do that but the studs in that wall weren't far enough apart for my last center. This one is significantly smaller so I may attempt it.


When I said rear walls I meant the one behind the MLP, not the one behind the center. I still don't have sufficient absorption back there.
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post #7395 of 12645 Old 12-13-2013, 04:36 PM
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No posts today?

What a bunch of slackers biggrin.gif

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post #7396 of 12645 Old 12-14-2013, 10:52 AM
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Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

I'm headed to the basement now to a bunch of test sweeps with varying locations for my mains....

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post #7397 of 12645 Old 12-14-2013, 04:39 PM
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Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

Spent my whole day taking measurements with different methods of trying to reduce my primary floor reflection. Will post later when I get my head together. smile.gif
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post #7398 of 12645 Old 12-14-2013, 08:26 PM
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Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

Active Bi-Amped yesterday. Passive crossover be gone!
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post #7399 of 12645 Old 12-14-2013, 09:25 PM
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My laptop has an SPDIF output (same 3.5 mm as the headphones) What are my options? Do I need to get a sound card or can I just use a 3.5 mm to stereo RCA jack. Can I get a 3.5 mm to digital coax adapter?

-Greg
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post #7400 of 12645 Old 12-15-2013, 01:51 AM
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^
That output is probably optical?
Anyway, you need an output (to send a test signal to the speaker) and an input (to receive the response from the microphone).

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post #7401 of 12645 Old 12-15-2013, 07:49 AM
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Right. I understand that I need an output and an input. For the input I plan on getting a USB mic. My specific question is regarding the output. It's a small headphone jack (3.5 mm) and it is labeled with the headphone symbol and SPDIF. From what I understand, that means I could get an adapter that plugs into that 3.5 mm jack which would allow the signal to be sent as spdif. I think typically in this case it would be a digital coax. Can I use that for my output to send to my receiver? I always thought it was necessary to use a sound card with a laptop unless you have an HDMI output in which case you can use that AISOS (?) program to direct the signal. Otherwise can I just use the headphone output (analog)?

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post #7402 of 12645 Old 12-15-2013, 08:08 AM
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^
Sure, you can use a headphone output.

Markus

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post #7403 of 12645 Old 12-15-2013, 08:14 AM
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So, using the headphones output (just the stereo output) is acceptable now? I don't need a separate sound card? I am okay manually plugging the receiver output to whatever speakers I am testing (don't need the AISOS program). I just always thought I would need a separate soundcard if I didn't have HDMI output.

-Greg
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post #7404 of 12645 Old 12-15-2013, 08:17 AM
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Quote:
Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

 

I'm on a measurement break. As soon as I have installed the last tricorner traps (soon) and moved the position of my Height speakers to the side walls (per an idea of Sanjay's) I will be re-calibrating and re-measuring...

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post #7405 of 12645 Old 12-15-2013, 08:19 AM
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I just reread the first page of this thread and I think I got my answer confirmed (your answer as well).
Quote:
There are no other "black boxes" needed. You will NOT need a full duplex sound card because you aren't using the sound card's mic input and speaker/line output at the same time, as you'll be using the USB Mic. So the built-in sound card that every PC/Laptop has works fine. (Using it this way myself on a cheap laptop)
That's what I didn't realize. The USB mic allows this. I think I got it now.

-Greg
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post #7406 of 12645 Old 12-15-2013, 08:37 AM
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And just to clearly understand, as I get ready to purchase a usb mic, the prefered orientation of the mic during when testing is straight up and down. From the guide:
Quote:
The mic’s are provided with several calibration files, including a 90-degree calibration file, which is the angle used for REW measurements.
Is 90-degree straight up and down?

-Greg
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I finally ordered a UMIK-1 from Cross Spectrum (also posted in the Klipsch thread). It is set for delivery on Tuesday. I plan to measure my current set up with a Hsu VTF-15H and then introduce my new dual DIY ST HT-18 D2 sealed subs (not quite finished yet, but should finish today, they are all sanded and primed) replacing the Hsu. I have a MiniDSP and an SMS-1 that I can use for sub EQ. With REW I think the MiniDSP will be a better device. Can't wait to see the results.

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post #7408 of 12645 Old 12-15-2013, 08:45 AM
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Quote:
Originally Posted by angryht View Post

So, using the headphones output (just the stereo output) is acceptable now? I don't need a separate sound card? I am okay manually plugging the receiver output to whatever speakers I am testing (don't need the AISOS program). I just always thought I would need a separate soundcard if I didn't have HDMI output.

If your laptop has any kind of audio in/out then it has a sound card. Good read: http://www.hometheatershack.com/roomeq/wizardhelpv5/help_en-GB/html/gettingstarted.html#top

Markus

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post #7409 of 12645 Old 12-15-2013, 08:59 AM
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Quote:
Originally Posted by angryht View Post

And just to clearly understand, as I get ready to purchase a usb mic, the prefered orientation of the mic during when testing is straight up and down. From the guide:
Quote:
The mic’s are provided with several calibration files, including a 90-degree calibration file, which is the angle used for REW measurements.
Is 90-degree straight up and down?

 

Yes, pointing to the ceiling.

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post #7410 of 12645 Old 12-15-2013, 09:03 AM
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Got it. Thanks. Looks like CSL is out of the minidsp UMIK-1's. Is that one preferred or is the UMM-6 okay to use?

-Greg
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