A Pipe Inside A Box

JimOfOakCreek · 26th March 2013, 02:11 AM

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.

planet10 · 26th March 2013, 03:03 AM

Quote:

Originally Posted by JimOfOakCreek

Has a hybrid Horn/Bass Reflex design ever been tried?

Yes.

I don't see a horn in your illustration.

dave

JimOfOakCreek · 26th March 2013, 03:54 AM

Quote:

Originally Posted by planet10

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?

xrk971 · 26th March 2013, 04:07 AM

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.

Scottmoose · 26th March 2013, 08:55 AM

Quote:

Originally Posted by JimOfOakCreek

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.

JMFahey · 26th March 2013, 10:12 AM

Quote:

Originally Posted by JimOfOakCreek

Has a hybrid Horn/Bass Reflex design ever been tried?

I think so

Since about 1935

Scottmoose · 26th March 2013, 01:46 PM

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.

JimOfOakCreek · 26th March 2013, 05:02 PM

Thanks...I guess I'm not the genius I thought I was.

picowallspeaker · 26th March 2013, 05:09 PM

Try this ( under projects\speakers\DCR )
Claudio Negro's home page, how to project and test a loudspeaker using Speaker Workshop

cogitech · 26th March 2013, 08:28 PM

Quote:

Originally Posted by JimOfOakCreek

Thanks...I guess I'm not the genius I thought I was.

Don't worry. You're not alone.

26th March 2013, 05:02 PM	#8
JimOfOakCreek diyAudio Member Join Date: Apr 2007 Location: Oak Creek, WI	Thanks...I guess I'm not the genius I thought I was. __________________ HiFi - Jazz - Wine

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26th March 2013, 04:07 AM	#4
xrk971 diyAudio Member Join Date: Oct 2012 Location: Virginia	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.

26th March 2013, 01:46 PM	#7
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	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.

26th March 2013, 05:09 PM	#9
picowallspeaker diyAudio Member Join Date: Apr 2007	Try this ( under projects\speakers\DCR ) Claudio Negro's home page, how to project and test a loudspeaker using Speaker Workshop