New 604 Cabs

GM · September 25th, 2012, 10:58 AM

You're welcome!

Correct, though unless you're using a high output impedance amp [what are you using?], tuning them much higher [~flattening the upper impedance peak], then 'critically' damping the vent to quell its 'ringing' will probably be better overall as it will bring up the mid-bass, lower mids and I'm guessing this is what you're missing based on your previous cab experiments.

That said, if I were there, I'd take advantage of the way oversize cabs by tuning them to Fs and use some cheap 25 ohm pots in series to dial in the amount of output impedance required for flattest woofer in room response, then adjust the HF level and maybe wire a by-pass cap around the L-pad to let the extreme highs through, then replace the cheap pots with a fixed resistor bank using commercial grade non inductive power resistors. High output impedance EQ on the cheap.

This assumes of course that the amp has enough power to handle the load without going into clipping when you 'crank' it.

GM

**juniper** · September 27th, 2012, 10:31 AM

Cradeldorf glad to see you are making progress. I have been looking for a new design for my 604's there are almost to many options..... I see you have tried a few and more than most. Have you tried a MLTL yet?

GM · September 28th, 2012, 11:54 AM

Originally Posted by juniper

I have been looking for a new design for my 604's there are almost to many options..... Have you tried a MLTL yet?

Short of horn loading, the MLTL yields the best overall performance WRT LF extension Vs acoustical damping plus allows more tuning flexibility and driver location, so has been my 'no brainer' default vent alignment since the '60s after auditioning one offered by RCA, though it was marketed as being simply a reflex. Seems Harry Olson missed a good patent opportunity with this one.

GM