A7 Project Thread

[Panomaniac]

Yes I do. Send me an email.

[VolvoHeretic]

Hmm, if you hit the baffle with a vintage Altec horn or MI driver, then you're so far past Xmax that you run the risk of the VC bottoming out and/or leaving the gap completely if a spacer is used and eventually it will most likely ruin the VC, requiring a re-cone. Spacers became required when folks got tired of blowing up Altec drivers with too much power and switched to JBL 2035H or similar before Altec came out with their own high power versions that required them for prosound and extreme HIFI apps.

I'll probably have a heart attack if I ever see the 515Bs move that much.

GM

That's interesting GM, I only know that I play mine with no sub-fequency filters, and the EQ pegged at +12db at the bottom, and you can see and almost count the warped record wow as in wow and flutter from the Technics SL1800 TT, and the woofer was moving a LOT.

[Voice_of_the_Llama]

Masked off where I want the labels to go. I decided I wanted them slightly higher than they originally were. Applied them with spray adhesive...

They look crooked but they're perfectly straight. The lines on the decal trick your eye.

[VolvoHeretic]

Ok, enough already with the pictures, get those puppies running.

[Audio_by_Goodwill]

Those don't look high to me. I think I've read (here on the forum, probably) that often times the labels were applied by the installer. Just going by your pictures, they don't look noticeably different from cabinets I've seen elsewhere. I've got a sticker that I cut out of a damaged cabinet, and while I can't say for sure, it looks like it was a similar height from the wood that's still surrounding it.

Those are looking really nice.

[GM]

That's interesting GM, I only know that I play mine with no sub-fequency filters, and the EQ pegged at +12db at the bottom, and you can see and almost count the warped record wow as in wow and flutter from the Technics SL1800 TT, and the woofer was moving a LOT.

Must be nice, I've seen enough 416s, 515s trashed from high power/over excursion in both reflex and 825 cabs back when high power SS amps came along to ensure mine never have to work hard to play loud.

Warped records, TT 'rumble' move the woofer slowly enough in a sine-wave for rising rate suspensions and lowering BL due to the VC leaving the gap to compensate, but high amplitude ['fast'] transients in the ~60-160 Hz BW can cause excessive overshoot. I imagine 'old guy' has a few stories to tell.........

GM

[Voice_of_the_Llama]

Got them put back together and set up in the living room for a test listen. I had to put the tweeters on max attenuation for the best sound. Right now they're being driven by a keyocera SS receiver and they sound pretty good but a bit harsh and "screechy"...what you would expect from most 80's SS amps through horn speakers... They are certainly not "Hi-Fi" speakers by any stretch but I think with some experimentation and modification I'll be able to get them to sound better.

[VolvoHeretic]

Nice grand, how come you didn't paint the A7's black to match it?

[analog addict]

Got them put back together and set up in the living room for a test listen. I had to put the tweeters on max attenuation for the best sound. Right now they're being driven by a keyocera SS receiver and they sound pretty good but a bit harsh and "screechy"...what you would expect from most 80's SS amps through horn speakers... They are certainly not "Hi-Fi" speakers by any stretch but I think with some experimentation and modification I'll be able to get them to sound better.

Throw the Keyocera in the trash can and get some toobs on those puppies....

[Voice_of_the_Llama]

Started gluing solid oak cabinet bracing...





Received the grill cloth that will go in the port



Original for comparison