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Altec 511b/416 crossover?

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Posted on May 17, 2012 at 08:19:10
DanK tubes
Audiophile

Posts: 367
Location: California
Joined: November 9, 2004
 I'm thinking of putting together a new HE speaker setup using Altec 511b horns with GPA 902-8a drivers, and GPA 416-8c drivers mounted in 10 cuft MLTL corner cabinets. I'm thinking of crossing them at 500Hz. Can anyone recommend a good crossover type for this? 1st order, 2nd order butterworth? Any other thoughts?
Thanks,
Dan

 

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RE: Altec 511b/416 crossover?, posted on May 17, 2012 at 09:30:13
Pro Sound Guy


 
The 902-8A minimum freq recommendation is 1200hz

The 902-8T can high pass at 500hz

It is NOT recommended to cross the 902-8A @ 500hz!

You risk damaging them @ 500hz

 

RE: Altec 511b/416 crossover?, posted on May 17, 2012 at 09:48:00
Coner
Industry Professional

Posts: 1348
Location: USA
Joined: November 17, 2001
 Like PS guy said 1200 for those drivers (@ 12db slope)
I think the smaller 811b horn would be a better choice
in this case. I see no advantage, using the 416, to go
below 800 Hz, as the 416 probably sounds better than the horn will
there and below.

 

RE: Altec 511b/416 crossover?, posted on May 17, 2012 at 10:09:00
kyle
Audiophile

Posts: 1092
Location: London Ontario
Joined: September 29, 1999
 It may be worth checking with GPA directly because the freqs used in the two previous posts are for original Altecs whereas the GPA versions indicate a 500Hz lower limit at rated power.

 

RE: Altec 511b/416 crossover?, posted on May 17, 2012 at 11:13:36
DanK tubes
Audiophile

Posts: 367
Location: California
Joined: November 9, 2004
 Thanks Kyle. I'm using flea powered SET amps so figured that was OK for the 902.
Dan

 

RE: Altec 511b/416 crossover?, posted on May 17, 2012 at 11:25:31
kyle
Audiophile

Posts: 1092
Location: London Ontario
Joined: September 29, 1999
 One other thought, I wouldn't use the 511 down to 500Hz. I don't think it loads properly. It sounds best crossed over at 800Hz. I think this is also this case with the 811, it sounds better crossed at 1200Hz. Many recommend using these horns half an octave above the cutoff frequency for best results.
I read that an 811 with a 416 (a la model 19) has lobing that provides better integration when crossed at 1200. I may be wrong.

 

RE: Altec 511b/416 crossover?, posted on May 18, 2012 at 07:47:26
Hornlover
Manufacturer

Posts: 1422
Joined: March 8, 2002
 The 511 should be fine at 500Hz. That was what it was designed for. I remember reading that its actual cutoff is about 375 or so. Use at least a second order slope, 4th order LR is better. Using a low power SET you most likely will not have any problem. I used to use a 60W amp on my 511/802 combo, and never had any problems (500Hz/2nd order, bi-amped), and I listened at realistic volume levels.

 

RE: Altec 511b/416 crossover?, posted on May 19, 2012 at 21:34:24
GM
Audiophile

Posts: 565
Location: Georgia
Joined: April 26, 2000
 As already noted or implied, only the early 802 and its 808 variant can load properly down to 500 Hz on a 511 with all others needing at least 800 Hz for decent power handling, especially for prosound or when excessive shelving is required to mate to a so-so efficiency woofer, though with flea power it shouldn't be an issue even if you need a bit of extra CD horn EQ to flatten it out.

Haven't messed with tubes since the '60s, so all I know is that 2nd order with an auto-former and woofer impedance compensation same as Altec N500G except for 8 ohm would be a good traditional XO.

GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

 

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