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Thread: Altec A7 refurbish

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    Senior Member sbjacob's Avatar
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    Altec A7 refurbish

    I pick up a few A7 cabinets in good condition and have repainted them I took the small crossover cover off the back and went to Ace and they scanned it to match the paint worked very nice I also ordered new logos off Ebay for them very nice for $18. for 4 . I have a pair of 511B horns and 909-16 drivers just need woofers I had a pair of Eminence Kappa C so I put them in just for kicks and used a Ashly XR1001 active with a BGW 750C on the LF and a BGW 250D on the HF had to turn the HF gain way down as it was over powering the LF any suggestions on woofers is the 416 the way to go on these?Name:  IMG_0480.jpg
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    I went to GPA website and noticed the 515 LF specs are close to the Kappa C 4 ohm Vas is 11.7 vs 16.6 the Qes .25 vs .26 Qts .25 vs .25 Qms 10.14 vs 11.6 FS 31Hz vs 27Hz

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    Nice looking cab!

    I have a pair that I am running new GPA 416-8Cs in the same 828 cabinet as yours. I really like the way they sound. I use them every day as the heart of my reference home theater system. Here is a plot of their frequency response before and after EQ. In this case the EQ happened to be Dirac Live running in a Datasat RS20i but similar results can be realized by using other systems as well.

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    The 515 from GPA is very similar to the 416. The 515 trades off a little on the bottom for a little more efficiency.
    _____________
    Best Regards,
    Carl Huff

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    Senior Member louped garouv's Avatar
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    For Altec choices, 416 will have a fuller low end...
    But some contend the 515s midrange is a fair tradeoff......

    Some folks even will run JBLs or TADs or whatever, sometimes with some gasket considerations/ modifications...

    I liked the 515b with some reflex subs best... (I was using four sets of EAW SB48s for low end)

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    Senior Member sbjacob's Avatar
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    Quote Originally Posted by louped garouv View Post
    For Altec choices, 416 will have a fuller low end...
    But some contend the 515s midrange is a fair tradeoff......

    Some folks even will run JBLs or TADs or whatever, sometimes with some gasket considerations/ modifications...

    I liked the 515b with some reflex subs best... (I was using four sets of EAW SB48s for low end)

    I talked to GPA the they did recommend the 515's in bass horn enclosures however I pretty happy with the Eminence Kappa C's but then again I have nothing to compare them with. The specs are similar to the 515's so I'm not sure I'm using a Ashly active XR1001 and added a JBL 2404 and built a 4th order passive for it.

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    Senior Member sbjacob's Avatar
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    Name:  IMG_0487.jpg
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    Quote Originally Posted by sbjacob View Post
    I talked to GPA the they did recommend the 515's in bass horn enclosures however I pretty happy with the Eminence Kappa C's but then again I have nothing to compare them with. The specs are similar to the 515's so I'm not sure I'm using a Ashly active XR1001 and added a JBL 2404 and built a 4th order passive for it.
    I finished one today sounds very nice I may add the JBL 2404 tweeter later

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    Senior Member Lee in Montreal's Avatar
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    Nice work.

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    Senior Member sbjacob's Avatar
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    Quote Originally Posted by Lee in Montreal View Post
    Nice work.
    Thanks always wanted a pair of these I just added the JBL 2404's and dialed it in with my RTA and I must say it's very nice.Name:  IMG_0489.jpg
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    Senior Member sbjacob's Avatar
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    Quote Originally Posted by sbjacob View Post
    Thanks always wanted a pair of these I just added the JBL 2404's and dialed it in with my RTA and I must say it's very nice.Attachment 56045
    Here are the networks I built for the JBL's as I'm using a Ashly XR1001 active 4th order Linkwitz 6000Hz crossover point.Name:  IMG_0490.jpg
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    Senior Member sbjacob's Avatar
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    Quote Originally Posted by sbjacob View Post
    Here are the networks I built for the JBL's as I'm using a Ashly XR1001 active 4th order Linkwitz 6000Hz crossover point.Attachment 56046
    Here they are between the big boys .Name:  IMG_0494.jpg
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    I like your Klipsch/ JBL stacks that you have. Is that a custom built 12 inch mid horn there in the middle?
    ____________
    Best Regards,
    Carl Huff

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    Senior Member sbjacob's Avatar
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    Quote Originally Posted by Carl_Huff View Post
    I like your Klipsch/ JBL stacks that you have. Is that a custom built 12 inch mid horn there in the middle?
    ____________
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    Carl Huff
    Hi Carl it is a Peavey MB-2 a near perfect match for the Klipsch MWM bass bins running them from 350Hz-1100Hz then the JBL 2360A's with EV DH1-A driver from 1100Hz up. I'm using a Ashly Protea 3.6SP processor with two Crown Xti 1000's on the MF and HF and a Crown Xti 2000 on the LF I needed a 2 ohm stable amp for the four K-43 2 ohm woofers 2 per side considered QSC RMX 1850 but I had the two Crown Xti 1000's and figured I would get the Crown so everything would match. I would like to get the Klipsch KPT-XII-MB(MF section) and the KPT-K-402-MF(HF section) but don't have the cash to spare as the K-402's with the K-69 driver are $2000 alone.

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    Quote Originally Posted by sbjacob View Post
    Hi Carl it is a Peavey MB-2 a near perfect match for the Klipsch MWM bass bins running them from 350Hz-1100Hz then the JBL 2360A's with EV DH1-A driver from 1100Hz up. I'm using a Ashly Protea 3.6SP processor with two Crown Xti 1000's on the MF and HF and a Crown Xti 2000 on the LF I needed a 2 ohm stable amp for the four K-43 2 ohm woofers 2 per side considered QSC RMX 1850 but I had the two Crown Xti 1000's and figured I would get the Crown so everything would match. I would like to get the Klipsch KPT-XII-MB(MF section) and the KPT-K-402-MF(HF section) but don't have the cash to spare as the K-402's with the K-69 driver are $2000 alone.
    The Klipsch K-402 and K-69 combo does sound good. I listened to many in commercial theaters. However I've got to believe that what you have must sound very good as well!
    ____________
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    Carl Huff

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    Quote Originally Posted by sbjacob View Post
    Attachment 56043

    I finished one today sounds very nice I may add the JBL 2404 tweeter later

    Hey, they are nice... I have some with 515's in and JBL2440/JBL2395 lens horns... the tweeter is essential in my opinion i have tried JBL2405 and JBL2402 - i prefer the former.

    I run BGW 250 on the mids
    BGW GTA on the 15's
    CROWN D75 on the tweeters

    and you're right, there's no way that bass is gonna keep up with the mids!

    I have also tried altec 421-8LF in the A7 - that's nice too.
    I did look at the 416 and it's not enough power handling for what i want - and it won't help keep up with the mids
    I have some TAD 1601b's to go in the A7 they sound amazing and much more energy in the lower end, but i can't turn them up loud yet because of gasket considerations!

    Also would you be using a sub with the A7's?

    Tom

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    Quote Originally Posted by sbjacob View Post
    Here they are between the big boys .Attachment 56059
    oh, i replied to an earlier post. i see you finished them. i bet they sound great. are you happy with the sound?
    I never tried the tweeter you used - is it a 2404? maybe i should get hold of one...
    Some people made a good argument for using a 3-way 18db per octave xover, which is what i went for instead of the 24db one you're using. i have never heard them set-up otherwise...

    the 515 i use is the 8g-hp which is 200W and all the other 515s and 416 are 75W.
    Do you have the problem still of the bass not keeping up with the mids?
    i tried to get hold of the bgw750 but they are rarely available in the UK so i went with the GTA... it was just too much to ship the 750.

    and of course sub will help. i use a lot of sub.

    tom

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    Quote Originally Posted by louped garouv View Post
    For Altec choices, 416 will have a fuller low end...
    But some contend the 515s midrange is a fair tradeoff......

    Some folks even will run JBLs or TADs or whatever, sometimes with some gasket considerations/ modifications...

    I liked the 515b with some reflex subs best... (I was using four sets of EAW SB48s for low end)
    hey, i was just wondering how you crossed over your subs and at what frequency?
    do you have them as additional to the 515's low end, or is there a HPF on the 515's?
    I made 4 LAB Subs and also 4 Tuba 30's (not my pics) which are a bit impractical actually, but go very low and smooth.

    tom

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