Tang Bang W8-1772 Impressions. - Page 45 - diyAudio
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Old 24th April 2013, 08:29 PM   #441
freddi is offline freddi  United States
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"BR" = "bass reflex" FWIW 1772 sounded nice in a little Karlson type

1772
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Audio Nirvana stamped-frame Super 8
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Old 25th April 2013, 03:25 AM   #442
Mike B1 is offline Mike B1  United States
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They all look the same in the beginning eh?

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Old 25th April 2013, 11:24 AM   #443
Datubie is offline Datubie  United States
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BR=Bass reflex. Is that a kit or did you design the enclosures yourself?

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Originally Posted by Darkheart View Post
Datubie, what did you mean by "What BR enclosures"?
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Old 25th April 2013, 11:34 AM   #444
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I Know, what BR means. But I didn't understand what were you asking.
Yes, I designed them myself. Enclosure width and depth was chosen to fit on my subs.
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Old 25th April 2013, 03:41 PM   #445
Datubie is offline Datubie  United States
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Ok. I have a similar idea for mine.

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I Know, what BR means. But I didn't understand what were you asking.
Yes, I designed them myself. Enclosure width and depth was chosen to fit on my subs.
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Old 3rd May 2013, 12:02 PM   #446
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Quote:
Originally Posted by Bob Brines View Post
I used 1.5mH||15Ω. I found that this helped with the baffle hump as well as baffle step. Note that I typcally have the driver 24" from the front wall and several feet from the side walls. I also use 2μF=5Ω across the driver. This brings down the rising response nicely and removes any spittyness from the speaker.

YMMV
Bob
Bob,
didn't you mean 1.5mH||5Ω instead of 1.5mH||15Ω? I don't know almost nothing about passive circuits, but I have calculated 4db BSC for 11" wide baffle and got L=1.5mH and R=4ohm. How do you get 15 ohms?
I used this for my calculations: mh-audio.nl - Home
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Old 3rd May 2013, 12:11 PM   #447
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Quote:
Originally Posted by Darkheart View Post
Bob,
didn't you mean 1.5mH||5Ω instead of 1.5mH||15Ω? I don't know almost nothing about passive circuits, but I have calculated 4db BSC for 11" wide baffle and got L=1.5mH and R=4ohm. How do you get 15 ohms?
I used this for my calculations: mh-audio.nl - Home
Try it both ways. See what works for you. When I test a speaker, I use an L-pad in place of the resistor and play with it until I hear what I want. Measure the L-pad and use that value resistor. (I also have a variable inductor. I took a 5mH Erse Super Q and unwound it, then rewound it with taps every 0.5mH 1.0-4.5mH.)

Bob
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Old 5th May 2013, 10:22 AM   #448
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Bob, I am not sure, if I understand you correctly (I'm not familiar with passive circuits at all). Do you use something like that?

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Won't this bring down speaker sensitivity to much?
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Old 10th May 2013, 08:36 AM   #449
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So I tried this circuit with similar values:
Lbsc 1.5mH
Rbsc 13.2ohm
Rz 4.7ohm
Cz 2.2uF

This is what I get:
Click the image to open in full size.

The response looks more linear but really sucks out life of music. Enclosure - 40l bass reflex tuned to ~63hz.
In parametric equalizer I used low shelf+3db and high shelf-3db @414hz with Q 0.7 and liked the sound. I would like to get passive circuit close to this. Any suggestions?
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Old 10th May 2013, 12:49 PM   #450
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Ah, yes. The problem with a dead flat response. Enter loudness EQ. Seemingly by nature we like to hear a smiley face EQ. Warm, bassy with a bit of tizz. The softer you play the speakers, the more EQ you want to hear.

You see why I advocate digital EQ. You can be much more precise with the EQ, and you don't have to solder in new parts to change it. You don't want a flat response, you want a smooth response. The lowest point of the FR should be ~2kHz -- the BBC dip.

BTW, I thought I answered you question about the filter reducing SPL, but I guess it got lost. Yes, a BSC filter reduces the ultimate SPL. Manufacturers tend to use the 1kHz FR level as the published "efficiency". It's often a lie. The real sensitivity it the ~100Hz response. Using your uncalibrated no filter FR, The 1kHz level is 9odB and the 100Hz is 85dB. That is a drop of 5dB and that is very normal.

Bob
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