Altec 902 Drivers

[bluesboy]

What is the difference between an Altec 902-8A and a Altec 902-8T?

[intotubes]

Not much.

[bluesboy]

Thanks

[Guinness]

My understanding is that the T has the loading cap installed on the rear cover cap to limit diaphragm excursion which increases power handling. The loading cap is removable. For hifi use, most remove the loading cap.

[bluesboy]

My understanding is that the T has the loading cap installed on the rear cover cap to limit diaphragm excursion which increases power handling. The loading cap is removable. For hifi use, most remove the loading cap.

Does removing the loading cap influence the driver's sound quality?

[Mick Bell]

When I purchased my 902s, I asked the same question of the folks out in Oklahoma who make it. No difference in sound quality and for home use we don't need the plug.

Mick

[bluesboy]

When I purchased my 902s, I asked the same question of the folks out in Oklahoma who make it. No difference in sound quality and for home use we don't need the plug.

Mick

So how do you go about removing the plug?

Thanks, Don

[Guinness]

This link from the Lansing Heritage site may be what you are looking for...

http://audioheritage.org/vbulletin/showthread.php?t=11977&highlight=loading+cap

[bluesboy]

This link from the Lansing Heritage site may be what you are looking for...

http://audioheritage.org/vbulletin/showthread.php?t=11977&highlight=loading+cap

Thanks for the link. It pretty much covers all the bases. By the way I think I'll have me a couple of Guinness brews today while watching the ball games.

[bluesboy]

What is the difference between an Altec 902-8A and a Altec 902-8T?

Keith, here's the thead describing the difference between the 902 8A and the 902 8T.

[soundbound]

I just recently emailed Bill at Great Plains Audio on removing the loading cap of the 902-8T because I just bought some myself. He replied that it does not make a difference in sound. I myself can see how it would, but if Bill says it does not. He should know more than most! On Bill's say, for now I'm leaving mine in.

[Spongeworthy]

Don, I spaced out and missed the end of the auction. It ended right ant the end of the State UNC game and I was so excited, I forgot about the auction.

[IB Slammin]

As I recall, Mr. Fogg has removed the caps from his 902's (two-way) and believes that there is an improvement in the top end.

IMHO, it comes down to the cross point, how steep the slopes are, and how hard they are driven. If one crosses at say 600hz or above, (even in 1st order) and listens to 80db peaks, cap removal is safe.

BUT, if one crosses at 400hz and hammers the SPL's in first order.......leave them in. I cross at 450hz or so, run them up to peaks in the 120db range, and hear no diaphragm click. Higher order, or extreme slope filters would be an extra factor of safety.

Again IMO, the 902 will handle much more than advertised. I believe that Altec gives them a conservative rating due to PRO use and abuse.

Terry

[Spongeworthy]

If anyone has a single, let me know please. I need one for a center channel project.

[JohnA]

I also have need of a single 902-8B and 511B horn, for a center channel.

[bluesboy]

I also have need of a single 902-8B and 511B horn, for a center channel.

Iwish I had enough room for a center channel. I need a bigger house.

[JohnA]

LOL!

It won't be used at home. My home center is a
Heresy. I'm going to build a 3rd Peavey FH-1/Altec 511B system
for the center channel of a 100 seat side auditorium in our new
church. We'll use it for movies on "Date Night".

[IB Slammin]

LOL!

It won't be used at home. My home center is a Heresy. I'm going to build a 3rd Peavey FH-1/Altec 511B system for the center channel of a 100 seat side auditorium in our new church. We'll use it for movies on "Date Night".

Think I would leave the plugs in and cross at 500 or 600hz if possible.[^o)] How far do you intend to run out the FH-1?

tc

EDIT: I now see that it is a sub.

[JohnA]

LOL!

It won't be used at home. My home center is a

Heresy. I'm going to build a 3rd Peavey FH-1/Altec 511B system

for the center channel of a 100 seat side auditorium in our new

church. We'll use it for movies on "Date Night".

Think I would leave the plugs in and cross at 500 or 600hz if possible.[^o)] How far do you intend to run out the FH-1?

tc

EDIT: I now see that it is a sub.

The FH-1s are not subs thought that is the stylish

term for woofer by almost everybody on eBay. They'll get down to

maybe 60 Hz with the Peavey woofer. tom Brennan says his went

down to 50, solid, in his home.

The FH-1s are a lot like big Belles. They run about 104

dB/w/m. I designed a network that crosses over at 1000 Hz

and shaves the 106 db hump off of the 902/511B. The high pass

slope is about 15 db/octave. I don't have to have an L-pad.

I also installed a polyswitch to protect the 902.

I'll post the schematic, if you are interested.

[IB Slammin]

LOL!

It won't be used at home. My home center is a Heresy. I'm going to build a 3rd Peavey FH-1/Altec 511B system for the center channel of a 100 seat side auditorium in our new church. We'll use it for movies on "Date Night".

Think I would leave the plugs in and cross at 500 or 600hz if possible.[^o)] How far do you intend to run out the FH-1?

tc

EDIT: I now see that it is a sub.

The FH-1s are not subs thought that is the stylish term for woofer by almost everybody on eBay. They'll get down to maybe 60 Hz with the Peavey woofer. tom Brennan says his went down to 50, solid, in his home.

The FH-1s are a lot like big Belles. They run about 104 dB/w/m. I designed a network that crosses over at 1000 Hz and shaves the 106 db hump off of the 902/511B. The high pass slope is about 15 db/octave. I don't have to have an L-pad. I also installed a polyswitch to protect the 902.

I'll post the schematic, if you are interested.

Please do.

tc