Finished my second BIB. This time Lowther DX3

gnugear · 6th April 2008, 01:55 AM

Wow, all I can say is that the Lowther Drivers are worth every penny. They only have an hour of play time on them and they're clearly better than the Fostex 168 sigmas that I built a few weeks ago. The presentation is more full, clear, crisp, and lifelike. Sounds like a curtain was in front of the Fostex drivers.

Here are a few pics. Excuse my mess but I'm revamping my entire system and need to get rid of stuff. As it is I'm doubled up on amps and speakers. Now that I've got the SET/horn bug, the traditional stuff will have to go. Thanks again to Zilla for his BIB site and Scottmoose for the dimensions. Up next is the Sachiko. I can't wait to hear what the Lowthers will be like in that enclosure.

gnugear · 6th April 2008, 01:57 AM

Right speaker with Mississippi John Hurt in the background.

gnugear · 6th April 2008, 01:59 AM

Fostex and Lowther BIBs next to each other. They're the same height but the Lowther is much deeper.

gnugear · 6th April 2008, 02:05 AM

one more with both speakers.

gmilitano · 6th April 2008, 12:49 PM

Nice work and thanks for the comparison between the two drivers. Looking forward to your comparison to a horn.

Scottmoose · 6th April 2008, 02:41 PM

The BIB is a horn.

MJK · 6th April 2008, 03:39 PM

Quote:

Originally posted by Scottmoose
The BIB is a horn.

Depends on how you define a horn.

Scottmoose · 6th April 2008, 04:11 PM

True, but then, what else could you call it from a technical POV Martin? Not trying to be pedantic, just curious. The BIB is a closed cone, or approximates one anyway, as it expands toward the mouth (unlike a TQWT, which is reverse tapered), and in practice is a 1/2 wave resonator with a 1/4 wave fundamental. That's pretty much the definition of a horn TTBOMK.

MJK · 6th April 2008, 04:28 PM

My definition of a horn includes the size of the mouth, in my way of thinking a horn's mouth completely damps the potential standing waves. For bass this means the effective mouth needs to be very big. My definition of a horn does not include resonances as an action that produces sound. A BIB relies on resonances to reinforce the bass, so to me it is a varient of a TL.

MJK · 6th April 2008, 04:30 PM

Quote:

Originally posted by Scottmoose
and in practice is a 1/2 wave resonator with a 1/4 wave fundamental.

If one end is open and the other end closed, I think you can only have quarter wave resonances. I am not sure how a half wave resonance shape can be supported by this geometry.

6th April 2008, 12:49 PM	#5
gmilitano diyAudio Member Join Date: Apr 2004 Location: Winnipeg, Manitoba	Nice work and thanks for the comparison between the two drivers. Looking forward to your comparison to a horn. __________________ DIY Audio Projects [ 10" DIY Subwoofer \| FE127E Sealed Bipole \| [ LM3886 Chip Amp / Gainclone \| K-12M Tube Amp Kit ]

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6th April 2008, 02:41 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	The BIB is a horn.

6th April 2008, 04:11 PM	#8
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	True, but then, what else could you call it from a technical POV Martin? Not trying to be pedantic, just curious. The BIB is a closed cone, or approximates one anyway, as it expands toward the mouth (unlike a TQWT, which is reverse tapered), and in practice is a 1/2 wave resonator with a 1/4 wave fundamental. That's pretty much the definition of a horn TTBOMK.

6th April 2008, 04:28 PM	#9
MJK Account disabled at member's request Join Date: Feb 2002 Location: Clifton Park, NY	My definition of a horn includes the size of the mouth, in my way of thinking a horn's mouth completely damps the potential standing waves. For bass this means the effective mouth needs to be very big. My definition of a horn does not include resonances as an action that produces sound. A BIB relies on resonances to reinforce the bass, so to me it is a varient of a TL.

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