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Do 511E and 311-90 really have the same basic specs as this seller claims?
What are the chances of this being an authentic pair since there doesn't appear to be a trace of aqua-plas on them?
Vintage Altec Lansing 511-E Horns (pair) w/ 288-16 Dvrs - eBay (item 230395083495 end time Nov-09-09 14:33:59 PST)
I am a current owner of a pair of authentic 511E/288-8G's. To answer your second question, I would have to say, slim & none. From the photo's, they look like hacked 511B's. He didn't even know enough to get the color right, let alone the aquaplast. Must have a great ring to them with the large format drivers.
I've never used the 311-90, but I doubt we would've mf'd two horns with the same spec's.
I got a pair of 511e's and gpa 288H drivers. I doubt he sandblasted them, which is probably the only way to remove the aquaplas.
But they may be perfect for the task, I dunno, can't tell. My pair of 511e's...well the throats were terrible and it cost me two days of slowly smoothing the throats out
with a grinder on an electric screwdriver, sandpaper and fill. But that's where the quality of the horn will play out. If I had the time I would buy up 2 or 3 dozen 511b's and convert them proper. Anyway, I would ask the guys for pics of the throats before considering purchasing them.
Do 511E and 311-90 really have the same basic specs as this seller claims?
I didn't read the blurb, but the 311 is a larger horn and will properly load the driver lower than the 511e.
Interestingly, there doesn't seem to be published specs on the 511 with detail to the degree of those published for the 311-90 which has a published low cut-off of 220hz, i don't for a minute believe a 511 is capable of that, but there's still folks who believe the earth is flat
I have another question or two for you fellas that own authentic examples, excepting the throat/driver flange, are they dimensionally identical to the 511A/B?
Both the '75 and '78 pro catalogs list a peculiarly odd set of dimensions for the 511E. I know we've discussed this before, but was a firm conclusion ever reached that verifies the dimensions in both catalogs to just be plain wrong?
I've never had 511b's at the same time to compare, but the 511E may be a factory modified 511b. I think other people believe the same thing, and some of them may feel justified in calling their own custom job a 511E. The factory 511E is gray, and aquaplas coated and the welds in the sector fins have been removed (or not done) and filled with (I think) aquaplas as well. Even hanging in the air they only thunk when thumped.
I second the statement about the metal flow left in the throats of the factory 511E's. Some of the one's I've seen were pretty bad.
I don't think there is any reason an authentic 511E should end up looking like those horns in the sale. They might work, after a fashion, but their value, to me, would be less than that of a useable 511b.
If you go to Altec Pro which is still up, and look at the PDF's...
The PDF labeled 511A states 500 HZ cutoff.
The 311-90 PDF states 220 Hz cutoff.
Sellers who don't know and/or could care less if they lie as long as the sale is made, claim they have the same specs. To dummies, they have the same specs cause they are 40x90, nothing else matters right?
So pick your label...ignorant or dishonest. Or both.
I have both. The 511E's I have, have the original dark grey color, aquaplas coating and original stickers with serial numbers on them. They are nothing more than modified 511A/Bs...trust me... I have viewed the catalog you referred to that intimates larger size... but until someone has a set and can provide incontrovertible proof....I'm convinced the catalog is garbage.Quote:
Originally Posted by bowtie427ss
There are a number of documented mistakes in Altec lit...usually dimensions..Quote:
Originally Posted by Steve Mac
Note the A is shown as huge too...8" taller than a B...
http://www.lansingheritage.org/image...pro/page13.jpg
Here is an interesting pic...looks like a cut off and welded on flange to me...
http://www.hostboard.com/forums/hbmc.../2009/11/4.jpg
Yeah...and look at the mounting ring which has been moved down too.Quote:
Originally Posted by Old Guy
That's exactly what mine look like....except the aquaplas coating on mine is very thick!
Oh, just interestingly found out my horns is here. :)Quote:
Originally Posted by Old Guy
I'll provide some more information about these511E vs 511B and comparing to 311-60 tonight.
I've also did some measurement on the frequency response of the 511E with the original 288D too.
I totally agree with Steve, who also have both 511E and 511B. To me, 511E would be a modification of the 511A/B series.Quote:
Originally Posted by Steve Mac
Cause they are just a modification, they just cut the throat shorter, solder the bigger mouting flange, add some alquaplas and that's all.
My 511E pair have 2 horns made in different time and they also showed some interesting difference! However, both of the having the same size and also the same size with the 511B except the shorter and bigger throat.
I don't understand and don't believe that Altec innocent enough to cross their horn at it's cut-off frequency (as with the A7-500 with N500 cross) in case the public 500Hz cutoff of the 511A horn is correct.Quote:
Originally Posted by Old Guy
Looking at how they named their horn, which all horn have cutoff frequency lower than the nominal lowest working frequency of the horn, we have ground to believe that the 511A/B horn should have lower cutoff frequency than 500Hz.
Of course, 511 can not be compared to 311 cause the first number has already show their norminal working frequency already.
Quote:
Originally Posted by chip_junior
Can't argue with that logic...I was more trying to show that anybody who states 511E and 311 have the same specs is a liar or a fool...
I would suspect the 511's cutoff to be between 400-500, I could calculate it but am too lazy. At my age you pick your battles.
But still sharp as a tack Thank You !!!!! :DQuote:
Originally Posted by Old Guy
I've done some basic frequency response measurement for the 511E with 288D driver using RadioShack dB meter. It look like that the 511E might not be suitable to be crossed above 750-800Hz.Quote:
Originally Posted by Old Guy
Here is the picture showing that the horn start to be rolled-off below 800Hz. The 511E+288D combo was actively crossed at 450Hz-LR24 and 8.5kHz-LR12.
http://www.hostboard.com/forums/hbmc.../2009/12/8.jpg
Look at the response, I think the 511E properly has higher cut-off frequency than the 511B due to having shorter throat as well.