newbie to Altec's

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Originally posted by CONVERGENCE:
Congratulations on your acquisitions.This set up will make a lot of DIY set up look like transistors radio.

I would make it a 3 way BI AMP the bottom part
from 20 to 250 second half 250 to 500 and horn
500 to 20kHz.

Can be used for rock group and you will get a lot of SPL Dynamic range out of it.

This sort of set up for small night club is the Ideal thing.

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<font size="2" face="Verdana, Helvetica, sans-serif">Hear, hear! Done this way, it will give the phrase "you will rock!" a whole new meaning.
That is exactly what I did in 1975, but I made mine a true 3-way tri-amp with an amp for each driver. I used a DeCoursey(he is long gone) active crossover at 800Hz and 7KHz. I used 2 Altec 414 12" woofers, 806 driver/811 horn, and an EV T350 super-tweeter. Sounds great even without the sophisticated instrumentation available today.

IMO, the entry fee you paid plus the gas was a good price for just the four horn drivers, even if non-working.

Consider the horns and four loaded 817 boxes as a substantial free bonus. http://www.hostboard.com/forums/

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IMO, the entry fee you paid plus the gas was a good price for just the four horn drivers, even if non-working.

Consider the horns and four loaded 817 boxes as a substantial free bonus. [Thumbs up]

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<font size="2" face="Verdana, Helvetica, sans-serif">Well to be honest ,, I was grinning like a dog eating cat s*** after I loaded it all up and headed back home which was rough for 2 people, had a appliance dolly , but it do not work so well with their small tires in the sand soil here till I got home to my driver way and hand a old navy buddy to help,,,,

I think I might have used maybe a 1/4 tank of gas,,,,so every thing came out under with trailer,gas,lunch and time included, $500,, not to bad I am guessing....

might have to get a hold of bill , I have seen that it is best to call him, and when that time comes I will...

Is there a walk through on replacing the diaphragms if needed?

thanks again all

http://www.greatplainsaudio.com/LgDrvrDiaRepl.pdf

Just saying hello to all, and that I just have had some new acquisitions of late.

Just to fore warn ya'll that this isn't a post about asking how much is my new stuff so that I can go flip it.. Might be a little long as well

here's the link to the pics, not sure if I am allowed to do that here or not.

The AA's High Efficiency forum

As you can see I came across some Altec MI stuff, I did not open up the 817's and see what driver they had, but I have seen through some searching that this might be the best choice for hi-fi reproduction. Is this true or is it a matter of preference?

I am going to be using these in a large (20'30') dedicated listening/HT area and would like to know if these could be used in that manner....

I mainly listen to music and have mainly tube amplification ,sets,and various other pp and an old pioneer SS receiver.

Also I need to check the diaphragms and make sure they are ok, how do I go about doing this? Will I need a torque wrench to tighten them down? I am diy-er and like to learn new things,,so I will be up too the challenge...

One of the 291-16k's is missing both positive and negative leads on it, is there a re fix for this? or am I'm screwed?

I plan on taking my time with this , since I haven't even cleared the ground for the new addition yet, so these will be set up in my garage , which is about 25'x25' in size,, I plan on only using 2 of the 817's cabs..

I look forward to any advice, experience and ideas you may like to share,, and If I am allowed I will post pics on my continued progress


Thanks,,,,

Well, could not find the edit button,,but I also meant to ask about building a xover/ or I am thinking about going with the behringer 2496? if that is it,, not sure,,

Thanks again

I saw your post on AA, quite the "loot", congrats. I'll leave the suggestions to the more knowledgeable, but do post your progress.

Dave

Essentially you have 3 diaphragm choices...

291- high power attenuated highs...stock unit, no longer made but available on ebay. Aluminum dome/mylar edge. Technolgy of the 70's

288- AFAIK GPA is only making one 288 fram in different impedances. The 288 is moderate power, good highs. An extra octave extension over the 291.

299...derivative of the 288, different aluminum alloy, high temp carbon fiber former. High power good highs, If you wanna play loud in a big room, consider these. newer technology than 291.

I have heard a zillion times the 288 and 299 frams test exactly the same...to my ears, which have made me a lot of money, the 288 has SLIGHTLY better highs. I don't want to open an argument on this, just point out where fact and opinion diverge.

If you are handy, replacing the frams you self isn't hard. You don't have alnicos right? So they won't need remagged.

GPA has a download with instructions on replacing frams.

Frams wire and terminals maybe 30 minutes a driver.

O G,

I like to consider myself handy and capable, so it looks like I will convert them into 288's then.....right now these 291's are 16ohm,, does it matter if I get 8 or 16 ohm fram versions then? they not alnico, so no re-magging for me


I will look on the GOA site for instructions... Thanks bowtie for the link....

gonna go do some reading now

btw I found the edit function here finally ,lol

O G

Went to the lansing heritage site and downloaded all the tech specs that apply to all the drivers, cabs and the horns, also copied the info on the T/S spec and xfered them to my own excel spreadsheet for future reference ....

I read about being careful with screwdrivers.... i guess i could use a non- magnetic one I guess, or tweaker? I am going to be looking at them all here in a bit.

A quesiton on measuring DCR, they say 16 ohms, I really doubt if they will read that high after all this time? what is the margin -/+ they should be reading,,,, I have seen 8 ohm speakers read around 6-8 ohms and still be fine..

I have still hooked these up for fear of damaging them..... I need to make a xover in the short term,, any suggestions?

gotta go ..

later