Thanks VA. that is possible from my room perspective. but i don’t know how to go about modelling the optimum baffle dimensions, and port size (based on 3/4 depth of port. Thats why i thought i’d play it safe and go with the 620b cabinet size. that’s 9cubic feet as opposed to your suggested 16.25 cubic ft. i could of course just proportionally extend the 620 cabinet design to give the required volume. is this an appropriate approach ? The 604-8gs i listened to that started all this off had stands that raised the speaker about 8 inches off the floor. i had intended to do the same, but if i can get better performance in building a bigger cabinet then i’d be keen to look at that. but it’s a risk for me because i’m new to this and don’t appreciate all the things i’m effecting by making changies. I did read one thread on a forum ( on the 604-8g) that suggested the 9 cu ft cabinet 620a produced as good a set of results as pretty much any other variation of size. but i’m not sure how subjective vs objective that was. Thanks again.
Thanks Winter, that’s good to know, My room is 13.5m x 5.7m x 2.6m LWH open at one end… so i’m quite liking the idea of a big Cabinet assuming i can get a similar performance to that I heard on the 8g at my friends a couple of weeks ago. it’s fair to say i enjoyed it as much as anything else i’ve heard. not necessarily as highly detailed or clinical, but i’ve been moving away from that over the years. i’ve had Avantgarde horns, tannoy Westminsters se’s, some big soundlab electrostatics. Devore orang 0/96 and the‘ve all been good in their own way. I thought the Altecs sound great.
Hi Tod, Yes, shipping from CONUS seems very expensive now... I bought my Westminsters from the US about 10 years ago and got them shipped here. That would be astronomical now. Wow! What a system. They are brilliant. I bet you were happy when you came across that lot !!! As much as I can tell from youtube they sound great. The system I listened too had a leak stereo 20 and point 1 pre. driving 604-8gs in a 620a Cab. The tone controls had been used to give a bit of low end boost. It sounded great. Big soundstage ( in a huge/tall room) effortless and a deep soundstage that was very free of the boxes. I've got a single ended 845 tube amp that I tried on his speakers, and I liked it, but I think I might be looking to some vintage tube electronics at some point too. Where does it end ??? Unless of course you come across a monster system like yours... I mean where do you go from there... Congrats I bet you enjoy it hugely. Nice choice of music too.I imagine that if you bought from the States, shipping would be astronomical. I got these one-offs, including the one-off electronic crossover and one-off passive eq units that go between the amp and horns and one of the Marantz 170DCs, from a recording studio that went out of business.
This is the best way to do it and when the group comes over, they say they've never heard 604s sound so good! (These would be 604E2s.)
Very rarely used. Too uncomfortable to rearrange the seating for them and I prefer my own creation.
That's very cool. what a lovey thing. I've got a smaller pair of Living voice auditoriums in my family room at the moment and use them daily. Once the Altecs are complete I'll decide whether to put them in there where they will get used a lot or into the "home theatre" room which is more dedicated but they will only get used once or twice a week. At least they'll be more manageable than the Tannoys at 140kg. When you say that you prefer your own creation, have you designed and made your own speakers ?Very rarely used. Too uncomfortable to rearrange the seating for them and I prefer my own creation.
I remember shipping a couple used large-scale train cars to Aussieland back in 1997 and the shipping was more than the train cars.
Like these. The railcars are 33" long.
JBL 2241H - 18"/ JBL 2251J - 9.75" / Modified Heil AMT.
Very nice indeed. I like a Ribbon tweeter. You are not lacking in fun toys there that's for sure.
db...I checked out the pricing on the GPA website and a pair of drivers and crossovers work out about 6.6k New Zealand dollars( plus 15% import tax ) . My Original 604-8k's are costing about 4k NZD. I'm not sure at this point how much my cabinets will be. I thinking of going a painted black cabinet with a Walnut veneered baffle. My friend has a pair like that, looks nice to me if not totally authentic. Especially on his custom stands. Hopefully they will end up a bit like this.but with a Walnut baffle. If my new drivers and crossovers turn up and are a big box of mangled bits then I may well go the GPA route. Which will indeed make this original purchase an expensive mistake. Still from what I've heard over the years. The Altecs perform up there. My last serious speaker was a pair of Orangutan 0/96's. They were lovely speakers. They are 30k NZD now. 18.5 USD . I expect to have my Altecs complete for 10k nzd 6USD. If I can do that I think I'll feel well ahead. It's going to be fun I think. Thanks for your comments.
Great-looking cabinets!
Hi Borg, 30mm will do, but if you can find a 25mm would be safer.Also use a little wood glue,it couldn't hurt. I can't wait to watch your build. Obviously, take step by step pics of the build. Dan
(Dont know whats going on above.That's part of my comment)
Also when I braced my 84 Corwalls with the removal back panel, I lined the piece of wood that the panel screws into with foam rubber weather strip for a better seal. Also will help with any vibrations from the cabinet...
That's a good idea too. I've got some automotive double sided tape it's a two mil thick rubberised strip , double sided adhesive. I think I'll glue and screw and then silicone seal any gap. I'd kind of like to try and make the box as connected and rigid as possible. so the whole box can work like a "tone wood" element. I don't know if this is a good or bad approach, but it sort of makes sense to me. I don't think that building a dense, very inert box( eg like out of MDF) was part of the initial design approach. My panel fit should be pretty good. Its being CNC layed out and cut. I'll try the cabinet without any damping first and see how that is, then damp opposite sides with wool insulation if I need to.... Hours of fun to be had...
