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Re: Karlson-coupler aspect - what might be juggled for aspect & performance?

Posted by GM (A) on March 3, 2007 at 14:56:30

In Reply to: Karlson-coupler aspect - what might be juggled for aspect & performance? posted by freddyi on March 3, 2007 at 11:07:55:

Greets!

Not sure what you're getting at, but these are BPs, so a basic one would be a type 2. Using an old version of LspCad and Altec's 604E's published specs I did a typical K alignment at 75 W rated power with 19 mm thickness vents. Note that the front vent ~ = Sd and that cone excursion doesn't exceed Xmax and that if an extra resonant chamber was added between the two tuned to ~70 Hz, then it would be well below Xmax and the roll-off would be more linear, just as you've seen/measured.

Anyway, as the front vent is reduced in area, the 3rd peak shifts lower in frequency/higher in amplitude, flattening the response and of course, vice versa. If each resonant chamber was increased in length to bring 1/4 WL damping to the vents, then they could be bigger for a given duct length, with even higher driver damping.

Did this answer your Q?

GM

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