I'm running my 604's at a crossover point of 1150.

[cradeldorf]

A buddy stopped over today and confirmed that they sound better than he's ever heard. Like I said over on AK if a 515 is indeed what the woofer section is, they are rated at 20-1000hz why they mated that with a horn that shouldn't be driven below 1600 is beyond me. Juniper All I'm gonna say is mine go well into the ear splitting level without batting an eye. I can almost hear them laughing.
Don they sound much more like they should this way.

[zelgall]

I've read that 604 E to the last sectoral before the CD types were only providing driver loading to about 1900 Hz but the Altec standard Xover is 1600 Hz

[cradeldorf]

I've read that 604 E to the last sectoral before the CD types were only providing driver loading to about 1900 Hz but the Altec standard Xover is 1600 Hz

I could never grasp the concept of loading since the phragm is barely moving in the first place and then every bit of air it is moving has to pass through 3 little human hair sized slits in the phase plug?
I can't imagine I could load the horn if I put my lips on the phase plug and blew as hard as I could. That is if my definition of loading means building some kind of back pressure from the air trapped in the horn tube and horn assembly itself. I would surely think the phase plug is what provides loading if there is to be any.

[Altec Best]

I could never grasp the concept of loading since the phragm is barely moving in the first place and then every bit of air it is moving has to pass through 3 little human hair sized slits in the phase plug?

Think of the diaphragm that is like a tuning fork.When you wrap on the edge of the tuning fork it puts out a lot of sound but you won't see it moving much.It is the tremendous amount of vibrations in such a short time that creates the output or (SPL).Or something like that.

[cradeldorf]

Think of the diaphragm that is like a tuning fork.When you wrap on the edge of the tuning fork it puts out a lot of sound but you won't see it moving much.It is the tremendous amount of vibrations in such a short time that creates the output or (SPL).Or something like that.

Okay, that draws a better picture in my head. Thanks.

[alancohen]

I still haven't built my XOs yet. After reading this thread I might try bi-amping my 604Ds with my Behringer DCX2496 first. Problem is I don't have enough amps and don't want to cannibalize my daily system to experiment. I might build another one of these: Transcendent Sound Cathode Follower Tube Amp and use it along with the one I have running my BR TV system to play with the 604s. They are a really sweet 3W/ch and I think I had around $500 all up into the scratch build of the first one. That's pretty cheap for a pure SE tubey.

[cradeldorf]

I stuffed the crossover back inside the cabinet today, then uncovered the front vent and put the full backs on. A different buddy stopped over and I let him have it with them....He was pretty much awestruck at how they sounded. It's fun sending them home like that. Funny thing is that he was over a month ago when they were sounding horrible. He approved that they were 1000's of times better now.

[Alien_Shore]

I still haven't built my XOs yet. After reading this thread I might try bi-amping my 604Ds with my Behringer DCX2496 first. Problem is I don't have enough amps and don't want to cannibalize my daily system to experiment. I might build another one of these: Transcendent Sound Cathode Follower Tube Amp and use it along with the one I have running my BR TV system to play with the 604s. They are a really sweet 3W/ch and I think I had around $500 all up into the scratch build of the first one. That's pretty cheap for a pure SE tubey.

Alan,
does the transcendent plan come with a BOM? If so would you mind sharing? I'm thinking about building another tube amp and this one looks promising.

[amandarae]

I still haven't built my XOs yet. After reading this thread I might try bi-amping my 604Ds with my Behringer DCX2496 first. Problem is I don't have enough amps and don't want to cannibalize my daily system to experiment. I might build another one of these: Transcendent Sound Cathode Follower Tube Amp and use it along with the one I have running my BR TV system to play with the 604s. They are a really sweet 3W/ch and I think I had around $500 all up into the scratch build of the first one. That's pretty cheap for a pure SE tubey.

You should check out TubeLab SE and Tubelab SE as well. You can build the amps at almost the same cost($500, or much much more depending on parts and transformers use), but the SSE can use 5881, 6550, KT66, EL-34, 6L6. I built several amps, and to me the Tubelab is the closest sounding Triode strapped Pentode SE amp to a true DHT SET amp using 45,2A3, and 300B(all of which I have). Excellent sounding with my Altec drivers. I am not affiliated to Tubelab by any means, just making a suggestion.

My amps
http://imageshack.us/a/img9/853/tubelabamps058.jpg SE(581/300B) on the left, SSE(using EL34) at the right.



Abe