The Transmission line with passive radiator

[Maxine01]

hi, i wondered if it would be possible to make a transmission line style box, with passive radiator as well. But the radiator would not be to adjust the resonance, but to increase the cone area.

 

[GM]

Greets!

I can't think of any reason why not ATM.

 

[Sonce]

hi, i wondered if it would be possible to make a transmission line style box, with passive radiator as well. But the radiator would not be to adjust the resonance, but to increase the cone area.

Passive radiator at the end of the TL is the same as Mass Loaded TL, but it must be tuned to resonance to extend low range. There is no increasing cone area here!

 

[DrBoar]

It has been done, there was a UK magazine around 1980 that called it " a flapping transmission line"! I do not recall the name of the manufacture but it was in either HiFI News & Record Review or in Practical HiFi.

 

[planet10]

I can see them in my head, i cannot recall the brand. It has been done, still being done.

It is pretty much what Sonce says, it is an “exotic" ML-TL, except that one has an extra resonance to deal with from the PR suspension.

dave

 

[GM]

FYI/FWIW I took 'increased cone area' as vent area without increasing vent/TL length, i.e. same tuning as a simple baffle thickness vent.

 

[Scottmoose]

I can see them in my head, i cannot recall the brand. It has been done, still being done.

Decware? Steve's been doing it for years -how effective the implementation is sans any details or measurements is anybody's guess of course.
https://www.decware.com/newsite/HDT.html

 

[planet10]

Not Decware, althou it is the kind of thinf Steve would try to spin as God’s gift.

A US maker. Ostensibly omni. And often quite squat. With names inspired by South Asian faiths.

dave

 

[ScottG]

https://shahinianacoustics.com/

 

[planet10]

There we go, thanx Scott.

dave

 

[ScottG]

 

[profiguy]

I remember Paul Simon being a faithful Shahinian customer. He used to own a pair of Obelisks. Not that it means much.

 

[Booger weldz]

Sim a long skinny VRc/Lrc in horn response with the PR entry in the former ‘Ap/Lpt’ section next to it changed to PR in ‘chamber type’ ??

it seems to be a MLTL, as mentioned . intersting

 

[djn]

When I bought my Shahinians the PRsat the ends of the TLs were gone (2 per cabinet). I played them for a while and really liked the sound. When I replaced the PRs the low end was tighter but, I don’t think, any lower.

 

[planet10]

Very pretty loudspeakers.

dave

 

[djn]

Here is the link to mine from the page Scott posted. Just click on Diapason Ensemble

https://shahinianacoustics.com/

 

[DrBoar]

The one I was thinking about was UK based not US.

 

[Maxine01]

This topic is a little late, but I learned more about transmission lines and passive radiators.

I'm currently thinking about passive radiator terminated transmission line box, as I think that a passive radiator may have some advantages instead of a vent in the termination, but I think a passive radiator can have lower SPL.

 

[Maxine01]

This topic is a little late

This topic is a little old. Was wrong.

 

[freddi]

not related but I had the little "Contrabombarde" woofer box - mine had exits on the bottom.