C-1200/1200H bass horn or transmission line

[gasfan]

I have 4 of these drivers, brand new never used. Got them on E-bay a number of years ago. They look and test perfect but the rims are badly cracked and dented. The solid seat past the outer perimeter where the gasket goes is still perfect so still usable. The damaged part could either be routed off, or they could be used out of sight. I was thinking I'd like to try my hand at a transmission line project. Thoughts?

Peter

[speakerdave]

This is just me wondering, but why not use them the way JBL used them?

[gasfan]

I guess my question is which type of enclosure will take best advantage of the 2206, sealed or ported? It only has to work from about 300hz so is it possible to downsize it to fit? How do I calculate that? Or should I just use a 1cu.ft. box which fits?

[more10]

If you choose ported for 2206 you will have problems integrating it because the port will shift the phase considerably. Use WinISD Pro Alfa to simulate response of your boxes. You will also need to handle baffle step in you design.

[gasfan]

They're Century Gold drivers but as I stated, damaged and don't look so good. In what other configuration were they used?

[pos]

They were used in the 50th anniversary century gold speakers.

As you can see the rims of the drivers are covered and not meant to be seen, so the dented look might well be normal

These are supposed to be very good drivers (evolution of the 128H), to be used as direct radiator in bass reflex boxes of around 40 or 50L tuned around 30 or 35Hz.
You would probably need some 1200Fe to beat them.
A pair per side would probably be a very good match for large horns like the TH4001 or A290.

[grumpy]

... except I -think- those gold rims -are- the frame, and very exposed.

[gasfan]

... except I -think- those gold rims -are- the frame, and very exposed.

That is correct. So?

[pos]

That is strange as the 5" mid also used in the LSR32 does not have integrated gold rims.
Anyway that is just an aesthetic matter: either add a rim yourself, or mount them from the rear of the enclosure and call it done.

[gasfan]

Does the 2206 have to have a 4cu.ft. sealed dog box?

[more10]

I believe that if you are going to use the 2206 from 300 Hz you can build the box very small. But simulation is needed, I can do one for you.

[gasfan]

I believe that if you are going to use the 2206 from 300 Hz you can build the box very small. But simulation is needed, I can do one for you.

Well, coming to me, that would be more priceless information, wouldn't it. Thank you

[ivica]

Does the 2206 have to have a 4cu.ft. sealed dog box?

I think that for 2206 'closed box' of 1 to 2 cft would be more then enough (over 300Hz), but using 2206 over 1kHz, would be may be questionable
Regards
Ivica

[gasfan]

I think that for 2206 'closed box' of 1 to 2 cft would be more then enough (over 300Hz), but using 2206 over 1kHz, would be may be questionable
Regards
Ivica

The 2441/2390s will take it from probably 800, I'm thinking.

[gasfan]

Excellent, Ian. Thank you. 10.3 it is! Understanding and applying T/S parameters is a hard lesson to get my head around. Your explanation borne of experience is very generous of you. I've been accumulating components for a few years now but have been afraid to get started. No fault of the Lansing Heritage site. You do have to know what questions to ask. You've been very insightful indeed. As were a couple of others on this site last fall directing me towards a 4-way , 4345 type configuration. I now have a starting point. Where can I get a look at GT's system?

Peter