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Old 26th March 2013, 02:11 AM   #1
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Default A Pipe Inside A Box

Has a hybrid Horn/Bass Reflex design ever been tried? More specifically, using a PVC pipe inside a Bass Reflex speaker box. See the attached crude drawing.
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Old 26th March 2013, 03:03 AM   #2
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Quote:
Originally Posted by JimOfOakCreek View Post
Has a hybrid Horn/Bass Reflex design ever been tried?
Yes.

I don't see a horn in your illustration.

dave
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Old 26th March 2013, 03:54 AM   #3
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Yes.

I don't see a horn in your illustration.

dave
Doesn't the pipe = a rear loaded horn? My thought is that the bass gets enhanced by the horn and the port tube. No?
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Old 26th March 2013, 04:07 AM   #4
xrk971 is offline xrk971  United States
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You have a longer internal path for a transmission line with vent output - so maybe this is a mass loaded transmission line. You need a mouth exiting into the outside to have a horn, internally having a straight pipe doesn't make it a horn. There is a interesting folded transmission line design from a while back that used a pipe in a pipe to get a long length with the driver placed at the fold point. The thing stood straight up like a vertical column.
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Old 26th March 2013, 08:55 AM   #5
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Quote:
Originally Posted by JimOfOakCreek View Post
Has a hybrid Horn/Bass Reflex design ever been tried? More specifically, using a PVC pipe inside a Bass Reflex speaker box. See the attached crude drawing.
Yes. It's a DBR / ML horn variation. No reason why you couldn't make one work, but no special advantages (or any for that matter) that I can think of.

Re the horn business, depends what you call a horn. Me, I call anything that expands toward the terminus a horn since it has to possess some form of 1/2 wave resonant behaviour. Of course, you could call the untapered pipe a plane-wave tube (often spoken of in relation to horns since they're most usually encountered when / for testing compression units), but they need to be stuffed to achieve similar impedance results, so not really any joy there either. YMMV.
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Old 26th March 2013, 10:12 AM   #6
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by JimOfOakCreek View Post
Has a hybrid Horn/Bass Reflex design ever been tried?
I think so

Click the image to open in full size.

Since about 1935
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Old 26th March 2013, 01:46 PM   #7
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Not what he's thinking of / describing. But yes, variations such as the VOTT have been around for decades. As have variations on what he's talking about.
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Old 26th March 2013, 05:02 PM   #8
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Thanks...I guess I'm not the genius I thought I was.
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Old 26th March 2013, 05:09 PM   #9
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Try this ( under projects\speakers\DCR )
Claudio Negro's home page, how to project and test a loudspeaker using Speaker Workshop
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Old 26th March 2013, 08:28 PM   #10
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Thanks...I guess I'm not the genius I thought I was.
Don't worry. You're not alone.
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