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Even BIGGER than Bigger, Badder BIB...
Even BIGGER than Bigger, Badder BIB...
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Old 24th October 2017, 06:22 PM   #1
BHD is offline BHD  United States
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Default Even BIGGER than Bigger, Badder BIB...

Hi everyone!

I have a pair of EV 12TRXB drivers and my bass head of a Yorkshire wife is wanting me to build something with more "lovely, lovely bass".

The TS parameters for the drivers that apply to the BIB are:

Fs: 45Hz

Vas: 167 Liters

Qts: .67

This results in box dimensions (approximately) of 80" high, 48" deep and 34" wide. I'm planning in turning them sideways so the 48" dimension is the "width". This will place the drivers about 3 1/2 feet from the side walls and about four feet off the floor. The room is long and narrow so that placement is just about right. I've explained the concept to my wife and she's okay with the size as long as it sounds good.

What sort of bass response should I expect? People who built the BBBIB with the Eminence 12LTA got really good results but I understand the EV 12TRXB is a different animal.

Any thoughts on whether this will work and what I can expect?
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Old 25th October 2017, 09:52 PM   #2
j.michael droke is offline j.michael droke  United States
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Default T/S for BIB

Quote:
Originally Posted by BHD View Post
Hi everyone!

I have a pair of EV 12TRXB drivers and my bass head of a Yorkshire wife is wanting me to build something with more "lovely, lovely bass".

The TS parameters for the drivers that apply to the BIB are:

Fs: 45Hz

Vas: 167 Liters

Qts: .67

This results in box dimensions (approximately) of 80" high, 48" deep and 34" wide. I'm planning in turning them sideways so the 48" dimension is the "width". This will place the drivers about 3 1/2 feet from the side walls and about four feet off the floor. The room is long and narrow so that placement is just about right. I've explained the concept to my wife and she's okay with the size as long as it sounds good.
What sort of bass response should I expect? People who built the BBBIB with the Eminence 12LTA got really good results but I understand the EV 12TRXB is a different animal.

Any thoughts on whether this will work and what I can expect?
Hi there: If I recall correctly, a BIB design works optimally for approximately Qts= .33 to .44. I do not have T/S for 12LTA. Try using cheep OSB for1. ...regards, Michael

Last edited by j.michael droke; 25th October 2017 at 09:53 PM. Reason: B
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Old 25th October 2017, 10:01 PM   #3
freddi is offline freddi  United States
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Even BIGGER than Bigger, Badder BIB...
T-S EV 12TRXB Cabinet Design - Techtalk Speaker Building, Audio, Video Discussion Forum

that proposed cabinet is 10 times the size of a Karlson K15. It would be an option but is tuned in the upper 40's - still, it would probably play better overall. http://i.imgur.com/oRygnBt.png

the Karlsonator 12 is smaller than K15, and tuned to ~37Hz so might make more sense for a K - option

there would be damped T-lines to work

12TRX had the stronger lower Q motor.

open baffle makes the most sense overall and will go lower
than a cramped cabinet

Last edited by freddi; 25th October 2017 at 10:12 PM.
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Old 25th October 2017, 10:51 PM   #4
phivates is offline phivates  United States
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Cramped cabinet? And limited x on open baffle? Me not get it.
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Old 25th October 2017, 11:18 PM   #5
freddi is offline freddi  United States
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Even BIGGER than Bigger, Badder BIB...
say a 2 cubic foot box - I think the OB would go lower

here's a rough comparison of a 175L tapered reflex to a K around K15 size


I want to see what GM can come up with horn-wise or TL-wise. !@TRXB is pretty sensitive

Click the image to open in full size.
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Old 26th October 2017, 01:12 AM   #6
phivates is offline phivates  United States
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The OP is proposing a 75 cu ft BIG box, so not at all cramped...
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Old 26th October 2017, 02:04 AM   #7
freddi is offline freddi  United States
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Even BIGGER than Bigger, Badder BIB...
that's a tiny house - and you guyz call me krazy for the Karlson stuff
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Old 26th October 2017, 02:40 AM   #8
freddi is offline freddi  United States
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Even BIGGER than Bigger, Badder BIB...
- and it should work fine provided braced pretty well

its not perfect on the input - but close - might take a bit
on the driver position. I'll let the BIB guys do this stuff.

half-space

Click the image to open in full size.

Last edited by freddi; 26th October 2017 at 02:46 AM.
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Old 26th October 2017, 01:37 PM   #9
phivates is offline phivates  United States
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I can't call anyone named Freddi crazy

Freddy
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Old 26th October 2017, 07:47 PM   #10
BHD is offline BHD  United States
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Thanks for posting that Freddi, it looks like it will put out pretty good bass.

I don't really mind the size at all, it will work fine in our living space. Turning the cabinets sideways will allow them to be put all the way into the corners and still put the drivers far enough away from the side walls for them to have a chance of sounding decent. I plan on putting record shelves between the cabinets so they won't look like they stick that far out into the room.

I'd really appreciate if one of the guys really familiar with BIB's would weigh in.
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