RE: ALTEC 604 transmission line loaded - -æ- 07:36:56 07/04/16 (2)
 RE: ALTEC 604 transmission line loaded - bare 19:20:11 07/06/16 (1)
 RE: ALTEC 604 transmission line loaded - -æ- 05:27:24 07/07/16 (0)

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 RE: ALTEC 604 transmission line loaded - -æ- 07:36:56 07/04/16 (2)
 RE: ALTEC 604 transmission line loaded - bare 19:20:11 07/06/16 (1)
 RE: ALTEC 604 transmission line loaded - -æ- 05:27:24 07/07/16 (0)
 RE: ALTEC 604 transmission line loaded - drlowmu 10:50:32 02/07/16 (7)
 RE: ALTEC 604 transmission line loaded - kwingylee 03:02:30 02/11/16 (4)
 RE: ALTEC 604 transmission line loaded - drlowmu 23:50:56 02/12/16 (0)
 RE: ALTEC 604 transmission line loaded - fred76 20:00:00 02/11/16 (2)
 RE: ALTEC 604 transmission line loaded - kwingylee 20:15:47 02/11/16 (1)
 RE: ALTEC 604 transmission line loaded - fred76 00:40:15 02/12/16 (0)
 RE: ALTEC 604 transmission line loaded - kyle 06:22:03 02/08/16 (1)
 RE: ALTEC 604 transmission line loaded - tube wrangler 23:25:54 02/20/16 (0)
 RE: ALTEC 604 transmission line loaded - 91derlust 01:41:25 02/07/16 (0)

The speakers run the GPA 604-8H-II in fairly large MLTL with GPA crossovers. Of course, there is more to them than that, but they are the main components.

I am not sure what a typical or atypical 604 system sounds like, but my GPA 604-8H-III duplexes in 290L+ MLTLs running custom Rick Craig crossovers certainly have free-flowing bass. Resolved and natural, but it is no 5-way fully horn-loaded beast.

The 604s are sensitive to implementation. My cabinets were specifically designed for SET amps and small to moderately sized rooms... and I would not have started the project without Rick Craig's crossovers being available.

The rest of my system is a little out of kilter at the moment and the speakers are letting me know it.

Cheers,
91.

"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein

Well, the only MLTL implementation I know of in October 2015 at Denver's RMAF was in Dennis Fraker's room, with HIS MLTL and HIS amps. Look up Serious Stereo.Com to read up about it. I was there all weekend to hear it.

Next year will be even better. It was Dennis' FIRST time in that room, and he did not have all the electronics and room treatment "sorted out". Glad you liked what you heard.

Here is what Herbie Reichert had to say.

http://www.stereophile.com/content/day-one-herb-reichert#Ag6eI6P2Fs4CZSJE.97

IMHO, I think Dennis will easily get 20% more (as of NOW) out of that room, in February 2016, and he will surely do so in the next RMAF 2016.

The free flowing bass is partially the speaker design, but mainly, Dennis' AMPS, which have no equal in SET land to my ears, in MY humble opinion, thus far.

Have fun,

Jeff Medwin

• Altec 416 MLTL

Also, you can go to the Tube DIY and SET Forums, and read all of Dennis' posts on amp design, under the Moniker Tube Wrangler, as he spells out what it takes, rather clearly.

The system was only running at about 80% of its potential that weekend !! I sure wish it was at closer to 100%, but that will be next year, or, a visit to Livingston MT.

By the way, at my place, I run 825 cabinets, a modified ALTEC A7-800, and I am enjoying the horn loading of the 15 inch ( a 515B ) very much. "I" am prefering the A7 presentation, ( with both drivers horn loaded ), over the MLTL point source, so far. However, I am still not done with the A7 setting it up, but this is my suspicion, that its simply more fun!!

Photo is some of my recent "mass-loading" speaker experiments. Those are 11.7 by 11.7 inch by 1.7 inch red concrete slabs, weigh 17.6 pounds each and cost only $1.47 each at Lowes. More mass is better, and its needed on any stock ALTEC speaker from what I am hearing thus far. Have fun in your journey.

Jeff Medwin

• ... we built a pair of these!