Tapered Wave Tube with Damp Duct(TWTD) for Alpair10.3, MAOP10, CHR-90

[sridip]

Officially called a "restricted terminus”. It provides mass-loading which adds another low pass filter in the design, allowing for less damping and more fundemental to reinforce the bottom.

dave

So this design should ultimately aid in extraction of a better low end...
Regards

 

[nandappe]

Brother just one clarification
the original Sibelius speaker has a narrow duct while your design has a much wider duct ... any difference in the design...

Yes, Sibelius uses a special driver, has a narrow duct area, short duct length, and unknown sound absorbing material.

DDVP has a larger duct area, longer duct length, and less sound-absorbing material.

 

[sridip]

Hello Nandappe ,
Thank you indeed for the response...

 

[Rated]

Can the rear facing opening of the TWTD be used close (1 foot) to a rear wall or would the DDVP with a front facing opening be a better choice? I'm assuming the low end response for the two speakers would be different this close to a wall?

DDVP (TQWT) and TWTD have similar low-frequency extension and volume.
DDVP has a large duct area and is attached to the front, making it more dynamic.
TWTD has a smaller duct area and is offset to the rear, resulting in fewer peaks and dips.

 

[Sonce]

Can the rear facing opening of the TWTD be used close (1 foot) to a rear wall

Yes.

 

[JohnnyDee]

Thanks 😊 Nandappe for this information!
I have been wondering 💭 which design would be better… and I’m not sure 🤔 which I would prefer… probably would depend on the driver… only way to tell is make both designs and use identical drivers to compare My preference!