Re: Altec 604 D Enclosures
Charles,
Are you able to take advantage of the room corners? In other words, might you be able to "build-in" large floor to ceiling corner IB boxes canted approx. 30 degrees towards the listening position? If so, this would be my first choice and you could add eq or series resistance to balance the system. This layout also gives you maximum boundary reinforcement while minimizing diffraction and creating a pseudo early-reflection-free zone, not to mention using the minimum floor space. Also, if your corner walls are sufficiently rigid, you may be able to get by with building just a well reinforced front baffle screwed and sealed to wall, floor and ceiling furring strips -- it doesn't get much easier than this. A 4' wide (standard for plywood in the USA) baffle set at 30 degrees will yield about 25 cubic feet.
Building a large enough closed box will also mean that you can stop agonizing over your speakers' TS measurements -- they are what they are, and as long as the pair are more or less the same, you will be in business.
Best wishes,
David
Re: Altec 604 D Enclosures
As for Open Baffle, here is a pair of 605As that I showed at the Lone Star show. The helper woofer is an 18" pro model with its own amp and active crossover.
Lone Star Audio Fest 2010, Dallas Texas | Hifi Zine
Re: Altec 604 D Enclosures
Quote:
Originally Posted by
Panomaniac
OMG!!! That's you??? I was totally checking the links out that you posted on Audio Circle Last night. I wondered if that was you and wanted to ask you about your comment that you made about OB crossovers being totally different than the bass reflex crossovers. I was wondering what the differences would be? But maybe we can start a new thread instead of hijacking this one. Nice OB design BTW. ;)
Re: Altec 604 D Enclosures
Yeah, that's me. And yes, we should start another thread about Open Baffle design.
Re: Altec 604 D Enclosures
Thans Panomaniac,
Very interesting indeed and not too bulky.The only problem i have with this system is that it uses a helper woofer + an extra amp + an extra active crossover.I really want to keep my system very simple for two reasons:
1.Space in the room:I already have two preamp(one per channel)and two monoblocks amplifiers(300B),on top of a tuner,a turntable which takes space,a CD player.I dont see myself adding an amp and an active crossover to all that.
2.Apart from the space i have a tendency to try to go for simple systems with no subwoofer.I dont mind sacrificing part of the low end(and by the way the upper end of the spectrum that i hear less and less) and i am more and more striving for systems which are musical ,lively and natural.
Thanks again for the suggestion;
Charly.
Re: Altec 604 D Enclosures
Il n'ya pas de quoi!
The helper woofer is silent on some tracks, you won't hear it on "girl with guitar" tracks, but it really helps when you need it. The bass amp need not be complicated. A simple plate amp will do, you can even run the subs mono from the plate amp without too much penalty. Use your 300B amps for the 604s.
Otherwise, I'd try to get the T/S parameters and work with GM to design a nice MLTL box. You can start with what he's given you and work on the ports.
Re: Altec 604 D Enclosures
David,
The only corners i could use are covered from floor to ceiling by bass traps(minichunks) made of rockwool and covered by 5 thin panels of wood of 2'x2' for each corner not to deaden the room.I would have to remove 3 of them in each corner to allow enough space for the two 604 and enough air around the drivers.I will then have in each corner one covered bass trap of 2'x2' at floor level and another one at ceiling level ,leaving enough space in between for a baffle about 3.5' wide 6.0' high ;I dont know wether this is enough to do the trick. If i get rid of the 2 bass trap together,i dont know what kind of impact it will have on the acoustic of the room which i spent months to treat acoustically with decent results for a relatively small room. By the way,when you refer to" Eq or series resistance to balance the system" ,how do you achieve that?
Any way we have got a potential option that i could work on with some additional guidance.
Regarding closed boxes not to have to worry about measures of the speakers,how big is "large enough"?I have to tell you that the 11.3 cb feet of my friend 's speakers are the maximum size i can accomodate .Actually i would prefer taller but not as wide boxes.
Thanks again for your input David.
Charly.
Re: Altec 604 D Enclosures
I don't have any bass problems with mine and I'm running them in open backed 12 foot cabs against the wall and driving them with a 16 wpc Marantz receiver. I shot a couple of videoa of them tonight in case you want to hear them.
http://www.youtube.com/watch?v=QOXRV...ature=youtu.be
http://www.youtube.com/watch?v=fgTzB...ature=youtu.be
Re: Altec 604 D Enclosures
Thanks Cradeldorf,
On my computer,it very difficult to give justice to your speakers.If i understand well, you have simply build boxes with no back panels,the walls of your room being the back panels!Interesting and pretty simple.What dimensions?
Re: Altec 604 D Enclosures
Shame on me!
When giving you the volume of the enclosures that i listened to at my friend place i gave the right external dimensions but the internal volume is 8.26 cubic feet( that is in good French 230 liters and not 320 liters!).So forget about the11.3 cb ft that i mentionned at the beginning of the post and which made the enclosures so big for a pair of 604.
I dont know wether this is going to encourage you to help me or to prevent you to do so.We shall see.
Dyslexic Charly.
