This is a mistake... Argggg!
They have been custom built by a local woodworker with the drawings I found in litterature (Jean Hiraga's book and original Altec's drawings). He did everything perfect but this stupid mistake. This has a influence on the FR (120 Hz accident). They should be fixed soon but this is quite a lot of work...Dominique
Agree , that with some form of horn loaded midbass, upper bass the sound becomes spatial with expansive imaging allowing for closer listening distance. I think this 100-1000Hz channel is the first most important to get right and then to concentrate on midrange horn.
(of course I'm also an ars who doesn't follow this principle due to eternal transitionary period
Ps . I also had an idea of hanging horns but I wanted to mount them rigidly on a track in order to be able to move them to tune and fine adjust whole 200Hz+ section over midbass, bass channels and save on floor space. Maybe in a next life cottage with cathedral ceiling
This is a mistake... Argggg!
Dominique
That's a bummer. Everything to do with giant speakers ends up being a lot of work, even if it's not a lot of work, if you know what I mean.
Someone help me out here. I see a lip on the horn mouth not the throat. Is it me or you guys?
You know Cal, I was thinking the same thing my DR. says I'm starting to need reading glasses but for the life of me I can't see No Lip. Where are you guys looking on the outer edge of cab or inside the flare ?
You know Cal, I was thinking the same thing my DR. says I'm starting to need reading glasses but for the life of me I can't see No Lip. Where are you guys looking on the outer edge of cab or inside the flare ?
Inside the flare next to driver...maybe the mounting board the drivers are bolted to overhangs the inside of the horn flare.
I have a pair of Altec 421 15" woofers with the alnico magnet. I've tried to find information on these, but have only found info on the ceramic magnet version. If anybody has a spec sheet or T/S parameters, it would be great. I'm trying to size a box for this woofer and need the specs.
Btw, if you have design ideas for the 421, please do share. Space is at a premium, so something small (although, this thread isn't exactly about small speakers) would be preferable.
Thanks!
Btw, if you have design ideas for the 421, please do share. Space is at a premium, so something small (although, this thread isn't exactly about small speakers) would be preferable.
Thanks!
If you guys are talking about the baffle not being cut right to the flare then I understand. I think the word lip threw me off. It looks like it was cut at maybe 7 or 7.5 inches instead of the stock 8"? Is that what you mean?
All this time I am thinking about the lip at the mouth where the moulding is mounted.
All this time I am thinking about the lip at the mouth where the moulding is mounted.
I have the 421 ceramics so I won't be much help but when mounted in the A7 cabinet (aka 1236) they do pretty well. The stock 1233 cabinets need plenty of EQ. I would imagine the ceramic/alnico issue is not huge when it comes to the spec. They did keep the same number after all so my guess is the specs would be interchangeable so it means if you are using them for a bass unit, you'll have to EQ and if using it for a midbass you might be just fine if you have a helper woofer.
Thanks Cal! For now, I just want to get them in a cabinet and hear them sing. In the future, they should have support down below. I understand these will do fine upto 50 Hz?
Will a standard sealed box work?
I am not a ported box kind of guy but these definitely have to be ported. They are a musical instrument speaker and need all the help they can get. 50Hz flat in a ported box is not unreasonable but you'll need some EQ. If you don't need the midrange these give you, paint some rubber cement on the aluminum dust cap.
Don't know Cal, they're not my speakers... I just noticed that they looked different than the other A5/7 cabs I've seen.