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Old 17th June 2017, 01:50 PM   #1
DaveCan is offline DaveCan  Canada
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Default MLTL Cab Plans For GPA 604-8H-III

Hello all,

*Note: I also started a thread at the Altec Board and this is a copy of it. http://www.hostboard.com/forums/f700...04-8h-iii.html

I'm starting this thread for an acquaintance who I sold my tube amp to. And this is specifically for the GPA 604 III driver: http://www.greatplainsaudio.com/down...604_8H_III.pdf

And the GPA crossover: http://www.greatplainsaudio.com/downloads/N604-8A.pdf

Or perhaps this crossover instead with the level controls: http://www.ebay.com/itm/Altec-Lansin...3D111609536780

He was recommended the Stonehenge V cabinets by Bill at GPA, and I mentioned that there are some different designs that would be worth checking out, like an MLTL design. I've read some on GM's before and mentioned it to him and so here I am. I cannot seem to find any plans for them though.

Are there any already completed GPA 604 III MLTL cab plans available?

Here's some particulars:

1- He will be using a low powered valve amp. I sold him mine that is 6watts rms, but I think he has a few others as well that maybe are more powerful.
2- Listening space 22'x30' (and I think 8' ceiling height)
3- Cabs would be used near both corners of the 22' wall facing out into the 30' long room. He can also use them close to the back wall or out into the room a bit, toed in etc
4- He doesn't mind big cabs, no WAF to worry about here.
5- He can't diy, but has a good cabinet builder that will make them for him.
6- I guess the best would be an all rounder cab that's known to work well, with dims and stuffing specified that wouldn't need tweaking, as he isn't the diy type.
7- Music tastes - Jazz, classical, rock, reggae, girl and guitar, pop etc.

Any help would be appreciated as to what might be a better design for him than the Stonehenge V.

A big cab is okay and SQ is everything.

Note* My thoughts were that sealed would work well letting them roll off naturally, and use subs under them etc. Like Lynn Olson with his 416 design etc. But then I figured a one cab solution to be a better fit which could squeeze out all that the 604 has to offer, and it would also be easier for him to set up etc. He lives far away from me so I can't help tweak them, like add and reduce stuffing amounts etc.

I didn't want to steer him wrong, and thought to come here and ask for your opinions for what would be considered as a good all rounder cab for the GPA 604III specifically.

Thanks for any help,
Dave.

Last edited by DaveCan; 17th June 2017 at 11:58 PM.
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Old 17th June 2017, 06:55 PM   #2
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Scott did a custom ML-tl called Bison,

Click the image to open in full size.

dave
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File Type: gif bison3D.gif (107.1 KB, 360 views)
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Old 17th June 2017, 07:22 PM   #3
DaveCan is offline DaveCan  Canada
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Oh yeah Cool! Thanks Dave! I saw that in a search the other day and then couldn't find it again. I'll look into it some more. Was that done for the GPA 604 h III driver do you know?

Btw! It's good to see you back in the saddle again and doing well!

Last edited by DaveCan; 17th June 2017 at 07:25 PM.
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Old 17th June 2017, 09:42 PM   #4
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Quote:
Originally Posted by DaveCan View Post
Was that done for the GPA 604 h III driver do you know?
Yes.

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Old 17th June 2017, 10:05 PM   #5
DaveCan is offline DaveCan  Canada
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That's great news then. I was reading at a forum earlier that mentioned the Bisons and that these were designed for small to medium sized rooms, but I don't suppose it would matter that much. I know that he can go big like 10-12+ cubic feet no problem, and I was also interested in what GM would think re the 604 III

The guy I sold my amp to has your Frugal Horn XL cabs and really enjoys them. He also has your fe206en drivers with your phase plugs. Also he was looking at some of your smaller bookshelf designs you had for sale, to use in his office and linked me some. I said I hadn't heard these newer designs but that you couldn't really go wrong as they should all sound good for their intended purpose.

Anyhow I guess I should try and talk with Scott and see what he thinks of the Bisons in a larger room, or if they could be enlarged some if need be. His room is 22'x30' and I think 8' ceilings. Low power valves will be the amp.

Last edited by DaveCan; 17th June 2017 at 10:16 PM.
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Old 17th June 2017, 10:47 PM   #6
DaveCan is offline DaveCan  Canada
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I found a little bit about the Bison design here in this older thread. *Note nothing is given away as far as dims go, or I wouldn't post it unless it was a known free design.. All that is said is it's 290 liters, so 10.24 cubic feet, Nice!

https://www.audioasylum.com/cgi/vt.mpl?f=hug&m=162175
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Old 17th June 2017, 11:01 PM   #7
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Does your friend already own the GPA 604-III? It is a great old-school speaker, but there are several better tube friendly new-tech speaker designs.
---
Agree on 3-way design: For a 25' x 15' listening room, putting the GPA 604-III in a cleverly constructed 2cuft(0.7) to 3cuft(0.577) sealed cabinet down to ~100Hz for the best possible transient response, and adding crossovers to a real woofer should be studied and discussed with your friend. Low power tube amps can produce strong bass if large woofers are used in large ported cabinets.
-----
Have you worked with your friend on room modeling to find the best speaker and listener position? Room sim tools will illustrate bass equalization requirements.
==========
There are a few well developed threads for MLTL designs for the GPA/Altec 604 which are optimized for the dimensions of a sheet of Baltic Birch Plywood... like 55" line height limit.
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Old 17th June 2017, 11:11 PM   #8
DaveCan is offline DaveCan  Canada
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Thanks, I haven't been able to find any MLTL plans specific for the 604h III in my searches, that include all the dims etc.

He likes single driver speakers and has a few and also has some big Maggies. This is his dream speaker though, he really wants the 604 and Bill at GPA mentioned the Stonehenge V to build. I mentioned to him that there are/were some MLTL for the 604's and that this would be the way to go.

Yes sealed and subs etc would be an idea, but he is not a diy guy and simple is better. So a cab for the GPA 604 III that gets the best out of the driver, and that's already worked out that he could just give to his cab maker to build is best.. This is for a KISS principle system etc.
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Old 17th June 2017, 11:23 PM   #9
ICG is offline ICG  Germany
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Quote:
Originally Posted by DaveCan View Post
I'm starting this thread for an acquaintance who I sold my tube amp to. And this is specifically for the GPA 604 III driver: http://www.greatplainsaudio.com/down...604_8H_III.pdf
The link does not work, here's the link to the data sheet: GPA 604 III (PDF)
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Old 17th June 2017, 11:32 PM   #10
DaveCan is offline DaveCan  Canada
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Thank you! Weird it was working before. Fixed and thanks
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