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Post by cpreilly11 on Sept 17, 2011 14:28:23 GMT -5
This morning I gave REW a run from 25Hz to 10KHz using the analog inputs and direct mode. I took four measurements around my listening position (2 sweeps each) on my two speakers. I used the ALL SPL page to average the response for each speaker. I then used the EQ->EQ Filters page to simulate adjusting the UMC-1 equalizer assuming a Q of 3.0 and the center frequencies from the EMO-Q menu as well as a target house curve. I made a second pass with EQ set based on the settings that looked best on REW. I am normally pretty conservative in my adjustments especially given the EMO-Q's fixed center frequencies which don't always align with problems. The results looked pretty good given the limited adjustments in the bass range. The averaged curve from several positions usually has less to adjust and is not so positionally dependent. Attachments:
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Post by Nemesis.ie on Sept 17, 2011 14:40:20 GMT -5
CPReilly: re: Emo-Q - IMO the sub EQ (which only does LFE) is not enough EQ (it's not even parametric (unless that changes in the next FW as the chip SDK seems to imply the chip is capable) for crossed over bass you only get 2 (or 1 depending on XO) bands which is also a bit limiting.
So using a MiniDSP or BFD should give better results (and seems to IME/IMR).
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Post by Nemesis.ie on Sept 17, 2011 14:45:42 GMT -5
This morning I gave REW a run from 25Hz to 10KHz using the analog inputs and direct mode. I took four measurements around my listening position (2 sweeps each) on my two speakers. I used the ALL SPL page to average the response for each speaker. I then used the EQ->EQ Filters page to simulate adjusting the UMC-1 equalizer assuming a Q of 3.0 and the center frequencies from the EMO-Q menu as well as a target house curve. I made a second pass with EQ set based on the settings that looked best on REW. I am normally pretty conservative in my adjustments especially given the EMO-Q's fixed center frequencies which don't always align with problems. The results looked pretty good given the limited adjustments in the bass range. The averaged curve from several positions usually has less to adjust and is not so positionally dependent. That looks like a nasty hole from 60 - 100 - is it centred on the crossover frequency perhaps? Is there a phase issue there? What does adjusting the phase of the sub (in real-time using the RTA screen) show? Is the XO at 80Hz? What does moving that do?
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Post by cpreilly11 on Sept 17, 2011 15:46:52 GMT -5
I am just running the system shown as a 2-channel system without a sub. I can try playing some more with the speaker location.
I do own a BFD but its currently not in use. I could insert the BFD between the UMC-1 and the XPA-2 if I get another cable. I only felt comfortable doing that on the LFE channel in the past. If I inserted the BFD, I could have REW produce the parameters directly but I would be inserting a second A to D to A chain.
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Post by Nemesis.ie on Sept 18, 2011 11:02:54 GMT -5
Aha, getting a sub would likely help.
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Post by wizardofoz on Sept 18, 2011 11:43:03 GMT -5
Another friend of mine did some tests with the ratshack SPL and did setups with and without emoq and moving the speakers around an go almost no variance which seemed rather odd as the emoq settings are nowhere near flat. I am sure when time permits we will revisit this both at his and my places and see how we progress...I am alo looking at a reality check with a dedicated product for this - the Phonic PAA3
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Post by Nemesis.ie on Sept 18, 2011 12:27:28 GMT -5
Neat, but it seems a little pricey at £230.
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Post by cpreilly11 on Sept 23, 2011 10:43:19 GMT -5
After playing with REW to optimize my speaker location, I still could use some PEQ help to correct for my room at lower frequencies. I think my Revel F32's have enough bass to not require a sub for 2-channel listening. The miniDSP looks like a good match to sit in between the UMC and my XPA-2 and add some specific correction without adding a lot of noise. Is the Rev A version appropriate (.9 VRMS) versus the Rev B version (2 VRMS). If I understand properly when using RevB at 2 VRMS that affects both the output and the input sensitivity. I am leaning towards the Rev A but I am worried about the output coming up short. Are folks leaving the miniDSP on or using a trigger to turn it of and on (in my case via a Panamax power strip)?
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Post by Nemesis.ie on Sept 23, 2011 10:49:57 GMT -5
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novisnick
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Post by novisnick on Jul 8, 2014 9:26:56 GMT -5
Hi all need a little help with REW , I followed Andrews video for subs and I keep getting 7 filters instead of three. If this is wrong, what the heck am I missing. If it's correct which ones do I use. I followed the video closely, just not sure what I'm doing wrong. Can anybody give a guy a hand?
Thanks so much.
Nick
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Post by garbulky on Jul 8, 2014 9:34:13 GMT -5
Hi nemesis. I would like to know more about REW too. I like your style. If you ever get the chance to complete your guide I would enjoy reading it. Thanks.
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Post by Deleted on Jul 8, 2014 9:40:00 GMT -5
Hi all need a little help with REW , I followed Andrews video for subs and I keep getting 7 filters instead of three. If this is wrong, what the heck am I missing. If it's correct which ones do I use. I followed the video closely, just not sure what I'm doing wrong. Can anybody give a guy a hand? Thanks so much. Nick Are you making sure you switch the type of PEq you are using on the top?
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novisnick
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Post by novisnick on Jul 8, 2014 9:42:40 GMT -5
Hi all need a little help with REW , I followed Andrews video for subs and I keep getting 7 filters instead of three. If this is wrong, what the heck am I missing. If it's correct which ones do I use. I followed the video closely, just not sure what I'm doing wrong. Can anybody give a guy a hand? Thanks so much. Nick Are you making sure you switch the type of PEq you are using on the top? Where would that be?
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Post by Andrew Robinson on Jul 8, 2014 9:44:37 GMT -5
Hi all need a little help with REW , I followed Andrews video for subs and I keep getting 7 filters instead of three. If this is wrong, what the heck am I missing. If it's correct which ones do I use. I followed the video closely, just not sure what I'm doing wrong. Can anybody give a guy a hand? Thanks so much. Nick You can have 7 filters depending upon your settings in REW. I tend to believe that if you need more than 3, you should probably reconsider where you've placed your sub. Move your sub around the room and see if you cannot get a better response and thus require fewer filters. But it's not uncommon to need more than 3 filters for tricky rooms.
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novisnick
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Post by novisnick on Jul 8, 2014 9:45:21 GMT -5
Are you talking about the Equalizer : Generic?
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novisnick
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Post by novisnick on Jul 8, 2014 9:47:15 GMT -5
I've done this before with the sub in the same spot and have gotten 3 filters
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Post by Deleted on Jul 8, 2014 9:49:23 GMT -5
Yes. The too right there is the eq that you will be using. I beleive the default is bfd. Change it to the PEq you will be using
Also if you have room correction in your avr run that first with the PEq (no filters) in line
Then run REW to create filters. It should be much fewer total filters
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novisnick
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Post by novisnick on Jul 8, 2014 9:49:42 GMT -5
I have the gain set to just below 12 o' clock and my SPL meter reads 88 - 90 And when I set my flatness target it's around 88.6
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Post by Deleted on Jul 8, 2014 9:54:47 GMT -5
That's fine as long as you REW response was around 88 you'll be fine
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novisnick
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Post by novisnick on Jul 8, 2014 9:57:17 GMT -5
Yes. The too right there is the eq that you will be using. I beleive the default is bfd. Change it to the PEq you will be using Also if you have room correction in your avr run that first with the PEq (no filters) in line Then run REW to create filters. It should be much fewer total filters I have run my room correction but I'm not using the AVR I'm using sub a Berghenger and a Radio Shack SPLmeter along with the PC and REW
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