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post #811 of 7120 Old 08-23-2008, 04:23 AM
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Quote:
Originally Posted by weverb View Post

Changed the range on the graphs.

I turned off my powered amp when I first ran the test. Then I turned it on for the second. With the amp off, I thought the speakers would not respond. My receiver has the mains set to small and xo at 80Hz.

No smoothing added.

http://www.hometheatershack.com/foru...-rew-noob.html

brucek knows his stuff at The Shack....

This is what I"m trying to do with REW & BFD:

I take my readings and set my target level midway between the peaks and depressions. Then I use 1/3 or 1/6 octave smoothing. Now I find Peaks from 20 to 80Hz, assign filters, optimize and adjust PK gain.

I take the filters generated by REW and enter them into the BFD and re-run REW. My Wife is laughing at me because I will be back at it tomorrow in the theater room.

weverb, where are you going now? Are you going to switch the EX & MBM?

Larry
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post #812 of 7120 Old 08-23-2008, 07:03 AM
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Quote:
Originally Posted by laugsbach View Post

weverb, where are you going now? Are you going to switch the EX & MBM?

I want to get this REW thing figured out. Comparing the REW graph to the last Excel graph I posted has me more confused. Look at the different readings at 80Hz. Make sure you look at the second REW graph because that also had the mains on (like the Excel sheet). How can they be so different?

Moving forward, the next test will be to switch places with the MBM and EX. I already scoped out where the EX will go and there seems to be just enough space. It will not be in the same exact spot as the MBM (will not fit). Just the same corner. I am hoping to get some low end boost (like you did) in the corner. I will be following your lead by placing the ports closest to the corner and trying MO first.

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post #813 of 7120 Old 08-23-2008, 07:48 AM
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Good Morning weverb,

Yes, you have a different reading at 80Hz. Apply 1/3 octave smoothing and see what the reading is on REW. It should change slightly.

Larry
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post #814 of 7120 Old 08-23-2008, 09:26 AM
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Things look alot better with 1/3 smoothing! Still do not understand why the readings are so different though.

Do you go into your receiver and actually turn your mains off or do you just disconnect them?

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post #815 of 7120 Old 08-23-2008, 10:10 AM
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Interesting...MBM xo has been set to "out" during all this testing. I switch it to "in" and I get the attached.
LL

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post #816 of 7120 Old 08-23-2008, 11:33 AM
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Quote:
Originally Posted by weverb View Post

Things look alot better with 1/3 smoothing! Still do not understand why the readings are so different though.

Do you go into your receiver and actually turn your mains off or do you just disconnect them?

Sorry, I had to leave the house for The Wife....

I physically disconnect the mains when I run REW.
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post #817 of 7120 Old 08-23-2008, 11:35 AM
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Quote:
Originally Posted by weverb View Post

Interesting...MBM xo has been set to "out" during all this testing. I switch it to "in" and I get the attached.

xo is working now. You're quite-a-bit under the curve of I assume 80Hz... I am going to go to the Shack and follow your discussion...

Larry
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post #818 of 7120 Old 08-23-2008, 11:43 AM
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Ok weverb, I have my IE tabs working between here and The Shack....

Good discussion going on with you and brucek....

Larry
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post #819 of 7120 Old 08-23-2008, 12:06 PM
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New graphs added to the Shack! Let me know your thoughts.

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post #820 of 7120 Old 08-23-2008, 12:28 PM
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^^^

I'm learning just like you.

Next up will be a swap of the EX & MBM and running REW. A BFP will take care of the peak or the swap might help as well. You are doing very well, weverb and you are learning more and more about your set-up.

Larry
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post #821 of 7120 Old 08-23-2008, 12:40 PM
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Even more graphs for you Larry!

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post #822 of 7120 Old 08-24-2008, 06:47 PM
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Larry,

Anything new over the weekend? If you get a chance, go take a look at my graphs on the shack and let me know which one you think looks the best.

I may try swapping the MBM and EX tomorrow. I am at least going to play with the MBM's positioning.

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post #823 of 7120 Old 08-25-2008, 08:57 AM
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Well, after more playing around. I switched...

1. LFM-1 EX to max extension
2. MBM is rotated 90 degrees w/port facing lp
3. Main sub phase is 0, and MBM 180
4. Turned up main sub from 4.5 to 5
5. Mains are on
6. Receiver pink noise leveled mains at 75dB and subs at 78.5dB


LL

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post #824 of 7120 Old 08-25-2008, 07:40 PM
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^^

Hi weverb,

I'm sorry, The Wife had me working on some yard projects.

Your latest graph looks good. I'm heading over to the Shack and see the rest...

Larry
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post #825 of 7120 Old 08-26-2008, 12:57 PM
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My LFM+ and SMS-1 arrived over the weekend. I didn't get as much time to play as I would have liked but I managed to get them dialed into my system fairly quickly. I have an Auralex Gramma on the way wand I will wait till that comes before doing too much more tweaking.

here are some initial impressions.

The thing is a monster. I only had one place in my room where it would fit, which is a corner so I am feeling very lucky that the position works well. I read endless threads and articles about careful sub placement, and it all went out the window. With a box this big my placement choices were very limited. just something to think about. If it sounded good in the middle of the room I guess I could use the LFM as a coffee table.

I was really worried that I would be able to localize the bass. My mains (Audio Physic Yara's) were chosen primarily because I fell in love with their imaging and sound stage and I went with out a sub for quite a while for fear that i would be distracted by bass coming from elsewhere. The LFM blends beautifully. My wife couldn't beleive the bass wasn't coming from the mains.

It's not quite as musical as I had hoped, but I am going to reserve judgment untill the Gramma arrives and I can decouple the driver from my hardwood floor. So more on that later.

The SMS-1 works well. I have some nasty room nodes that I was able to tame pretty well. I still have some tweaking to do. for a while I was running two crossovers one in my receiver (BK AVR 305) and one in the sms-1 which was giving me a big dip around 80hz (go figure duh) once I turned of the crossover in the SMS things got much better.

I am surprised how much I need to ride the sub balance depending on the source material, so I am really happy to have the Diffrent EQ presets.

Over all I am pretty happy. I will post some pics and more thoughts in a week or so. thanks to all the folks in this thread who's experiences helped me pull the trigger.

"I was just reading here on my internet that Tofu is made from little baby seals". - Strong Bad
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post #826 of 7120 Old 08-26-2008, 01:07 PM
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Nice write-up Will-san! Thanks for sharing your thoughts!

I agree, you really need extra presets to tune your sub for music and home theater. What are you in now, Max Output or Max Ext?

Larry
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post #827 of 7120 Old 08-26-2008, 05:07 PM
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I am in max extension. My sub volume is plenty loud at three so I can't imagine I would need max output.

"I was just reading here on my internet that Tofu is made from little baby seals". - Strong Bad
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post #828 of 7120 Old 08-26-2008, 08:40 PM
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Quote:
Originally Posted by Will-san View Post

I am in max extension. My sub volume is plenty loud at three so I can't imagine I would need max output.

You say that now...


20 bucks says he has another one in 6 months
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post #829 of 7120 Old 08-26-2008, 08:41 PM
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BTW, nice write up Will
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post #830 of 7120 Old 08-27-2008, 05:23 AM
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Originally Posted by lalakersfan34 View Post

You say that now...


20 bucks says he has another one in 6 months

How funny!

I wouldn't bet against that happening, heck, within 4 months I went from one to four.
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post #831 of 7120 Old 08-27-2008, 05:48 AM
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Originally Posted by laugsbach View Post

How funny!

I wouldn't bet against that happening, heck, within 4 months I went from one to four.

Thanks to your amazing wife! You have no WAF to complain about. LUCKY MAN!

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post #832 of 7120 Old 08-27-2008, 05:54 AM
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Quote:
Originally Posted by laugsbach View Post

What I am getting at is to use the 75dB test tone or pink noise to set a SPL reading of 78dB on the EX (using the sub's volume control) and with the same signal set the MBM to read 75dB (using the MBM volume control). Set each one while the other is off and then play the test tone with both on and see what the combined SPL reading is at the LP.

So, as your cycle the test tone through your various speakers, the SPL reading at your LP would be 75dB on all speakers, 78dB on the EX and 75dB on the MBM.

Larry,

Here we are today...

1. Mains are at 75dB.
2. MBM is at 77-78dB.
3. EX is at 81dB.
4. Combined subs is at 79dB.

Moving my target value to 79dB for the subs and REW making the suggested filters.
LL

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post #833 of 7120 Old 08-27-2008, 06:20 AM
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Larry,

Well I read the house curve section again. I used REW to play a sine wave at 80Hz and had a spl reading of 74dB. I then had REW play a 32Hz sine wave and had a spl reading of 73dB. If I play a 100Hz wave, the reading only goes to 75dB. Am I understanding correctly that I do not need much of a curve?

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post #834 of 7120 Old 08-27-2008, 09:13 AM
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Quote:
Originally Posted by lalakersfan34 View Post

You say that now...


20 bucks says he has another one in 6 months

You guys are funny. I can't imagine what your systems sound like.

"I was just reading here on my internet that Tofu is made from little baby seals". - Strong Bad
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post #835 of 7120 Old 08-27-2008, 09:31 AM
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You guys are funny. I can't imagine what your systems sound like.

I would buy tickets to hear Larry's!

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post #836 of 7120 Old 08-27-2008, 10:06 AM
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Originally Posted by weverb View Post

I would buy tickets to hear Larry's!

LOL, too true! I think I'd have to buy two tickets - one for the HT experience and another for the airfare . The only question is which of the tickets would cost me more - if Larry charges in terms of the quality of the HT experience, it might be pretty close!
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post #837 of 7120 Old 08-27-2008, 11:29 AM
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LOL, too true! I think I'd have to buy two tickets - one for the HT experience and another for the airfare . The only question is which of the tickets would cost me more - if Larry charges in terms of the quality of the HT experience, it might be pretty close!

I would agree.

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post #838 of 7120 Old 08-27-2008, 02:57 PM
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Originally Posted by weverb View Post

Thanks to your amazing wife! You have no WAF to complain about. LUCKY MAN!

None whatsoever. I am very lucky guy and also that she loves movies and realistic sound. It helped that she grew up with three brothers who all continued on to music careers.
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post #839 of 7120 Old 08-27-2008, 03:04 PM
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Quote:
Originally Posted by weverb View Post

Larry,

Here we are today...

1. Mains are at 75dB.
2. MBM is at 77-78dB.
3. EX is at 81dB.
4. Combined subs is at 79dB.

I would like the above #'s as a great place to start before EQ. After you set your filters, you will need to double check all three again with the AVR's test tone.

Larry
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post #840 of 7120 Old 08-27-2008, 03:12 PM
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Quote:
Originally Posted by weverb View Post

I would buy tickets to hear Larry's!


Quote:
Originally Posted by lalakersfan34 View Post

LOL, too true! I think I'd have to buy two tickets - one for the HT experience and another for the airfare . The only question is which of the tickets would cost me more - if Larry charges in terms of the quality of the HT experience, it might be pretty close!

It would be a pleasure to host both of you here for a demo.

Tickets to a private showing are Free, however, the airline ticket to Cincinnati (the first or second most expansive airport in the country) would make both of you faint.

Larry
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