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Did Altec used 604 in a back loaded horn?

According to this site back in 1945 there was model A6 using 15" duplex.

Downsizing the port from 177cm2 to 120cm2 impoved the low bass a lot. Still missing the upper bass.

One more detail.

The volume of the BR (excluding the horn) is 250lt. I do not know how low it would measure but to my ears the system was chalenging the room in the low end.

No, it was a AN Ongaku clone. IMO and the owner's it was not up to the task of driving the horns. He is going to bi-amp with PP for the low and a SET for hi. He also holds a quiet impresive...

Yes they follow the tractrix curve.
No, I don't know why the baffle is curved.

The construction it is quiet complex. The guy runs a business that builds polyester/epoxy/carbon parts for cars....

Another one

An amazing set of horns which I had the pleasure listening to last night. Spacey technology and a relative result.

Bass driver Altec 515, mid-high TAD 4001.

Thanks for the replies.



First of all the amp used is a SET with DF 2.45 which doesn't put much control on the drivers. I have tried also solid state with high DF and I do agree that these...

Good day @ all

I have built a pair of 620 cabinets for my 604-8Gs but the bass is less than satisfying. Especially the mid bass is nowhere leaving the mid band hanging with no authority. Some...

Working on the 620 cabinets I do have a couple more questions:

1. What is the stuffing used. I have some info that in the original ones it was rockwool.

2. I do not get a detail in the...

Thanks

I'm new in the board and the Altec universe.

Just received my 8Gs.


What cabinet would you recommend for them? Looked at the 620 plans but any suggestions from more experienced users are...