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Topic: VOT matching center channel? Anyone selling?

bfish
Senior Hostboard Member

posted July 24, 2008 08:30 PM

Well, aside from being (clearing throat)...rough, the boxes look short in the reflex section to me. If those are 421s, they're modified, 421s have aluminum domes.

As someone who's (still working on) trying to make a set of beat (not that bad) boxes look pretty, I can say it would be less work to start from scratch. The curved part looks intimidating, but it's not really that hard.

Value? <$100, if that.

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bfish

"We're going ALL the way, till the wheels fall off and burn!"
Bob Dylan, from Brownsville Girl

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ClassicComics
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posted July 25, 2008 02:32 PM

Any chance an Altec Valencia would make a good center for my A7's? Only reason I ask is a local shop has a pair for $600. I think they have 811 horns, but I could buy a single 511 and swap. Other than that I have no idea how they compare sound wise...

Thanks!

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GM
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posted July 25, 2008 10:56 PM

Not really since the Valencia is a much lower efficiency speaker and uses a direct radiator woofer Vs the A7's mildly horn loaded one. Once you swap horns you could digitally EQ it all to a fare-thee-well to make it all come together for the most part, but as I probably implied in one of these threads you could have built either a clone of an 825 or 828 or the even the easier to build 810 cab by the time you research/find/buy one.......

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Loud Is Beautiful, If It's Clean

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scott in nc
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posted July 26, 2008 08:47 AM

Whoa baby! about forty years ago I would have tried to make those into something for our band!!! they almost look like they were underwater! run CC, run!
almost spit out my coffee with the throat clearing reference! thanks for the laugh! they look like something the carnivals of the sixtys and seventys would use to play loud rock while you were spinning and twirling with your best girlfriend! great memories. they usually had at least one blown horn and were being overdriven to the point of ragged distortion but we thought they sounded great!! I wonder what they are covered with? is that just paint, or some kind of resin or something? all seriousness aside, I would stick to your original A7 plan like GM has suggested and leave the guess work out of it. three A7s across the front will sound great!
just my .02.
scott in nc

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RonSS
Senior Hostboard Member

Member Rated:

posted July 26, 2008 02:13 PM

quote:
Originally posted by ClassicComics:
Any chance an Altec Valencia would make a good center for my A7's? Only reason I ask is a local shop has a pair for $600. I think they have 811 horns, but I could buy a single 511 and swap. Other than that I have no idea how they compare sound wise...
Thanks!

I'd buy those just because the price is good if they are in good shape.
Would make good rear channels.
I don't agree with the efficiency thing....you can control the center channel level, right?
I don't know if a 511 horn will fit in the box. And you would need a new crossover.
Ron

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bfish
Senior Hostboard Member

posted July 27, 2008 01:07 PM

quote:
Originally posted by RonSS:
...I don't agree with the efficiency thing....you can control the center channel level, right?
I don't know if a 511 horn will fit in the box...

Even with the same drivers and horns as in the 846 vs A7-8, the A7 box's horn gives 3.5dB of gain which also means it needs 3.5dB less HF attenuation (97.5dB vs 101). So, just kick up the center channel by 3.5dB and get a level match you think. That may suffice at low levels, but what happens on dynamic peaks? Depending on where you picked up the 3.5dB for the CC, the CC signal may get clipped. Even if you work around that, the 846 goes non-linear 3.5dB quicker. Run some limiters, and lose 3.5dB of total system range.

While maybe not as drastic, it's kind of like driving around on a doughnut spare...it might get you there, but you pay for it one way or another.

511s won't fit in 846s, it takes some finagelling with the back panel just to squeeze in an 811.

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GM
Senior Hostboard Member

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posted July 27, 2008 05:32 PM

Yeah, you're caught between a rock and a hard place in this situation with many of the current movies, though older, little/no action movies not so much as they put most of the action sound in the L/R main and LFE channels.

FWIW, ~four years ago I made a single 6.5" 'fullrange' driver ML-TQWT (vent loaded, reverse tapered TL) prototype for some folks, so obviously the only way I had to test it was in mono. Among other soundtracks I hooked it up as a CC expecting to get mostly the 100 - 7 kHz dialogue/surround channel's BW typical of early DVDs and was shocked at the BW it pumped out, though not nearly as shocked as that little 1" VC/15 W rated driver was when it tried to reproduce a big explosion before I could hit the remote's mute button.

GM

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bfish
Senior Hostboard Member

posted July 27, 2008 05:39 PM

You could'a used the protection circuit from those 18 flatulent booze drivers there, huh.

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Audio_by_Goodwill
Senior Hostboard Member

posted July 28, 2008 12:44 AM

quote:
Originally posted by bfish:
.... the boxes look short in the reflex section to me.

I can see what your saying if I look carefully.... real ones are about equal top to bottom.

To me the horn flares look funny..... like they're angled mid-curve instead of having a constant rate of curvature.

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Audio_by_Goodwill
Michigan, USA

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bfish
Senior Hostboard Member

posted July 28, 2008 02:39 AM

Yeah, if you include the box bottom and not the top, the horn opening should be almost exactly half. By scaling against the 4" dustcap, the horn opening appears to be ~2" greater than the remainder below it. The horn bottom panel looks to me to have too steep an angle, which could explain it. If it is only 1" low at the front, that would explain the 2" difference (1" taller horn + 1" shorter bottom).

Not that it matters much, they appear ready for doghouse duty anyway (assuming Rover isn't too picky). [Dog]

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JSP
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posted August 04, 2008 03:14 PM

Well, I just built a center with a 806/811 horn and a pair of 12" woffers on a horizontal design. The box sits on top of my big screen. This was to match the front pair of home made 416, 806/811's.

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ClassicComics
Senior Hostboard Member

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posted August 20, 2008 07:18 PM

Someone local in Georgia contacted me with this for sale, can you guys tell me anything about it from the pic.... does it look right? What do you think it's worth? It has an EV SP15 Triaxial speaker in it, but I asked him if he would just sell me the box, and if so, how much.... waiting for reply back.... thoughts?

[ August 20, 2008 07:19 PM: Message edited by: ClassicComics ]

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