Need a crossover for my new 400 lb center channel speaker...

**westend9** · July 26th, 2012, 09:38 AM

Originally Posted by bowtie427ss

I really think he needs a couple rows of par 64's across the ceiling in front of them, and maybe a couple pinspots in the back of the room focused just wide enough to illuminate the speakers themselves. Oh, and about 200 running feet of black backdrop to cover all the pink without undoing it's acoustic goodness. I'm afraid if AA sheetrocks that space, he won't like what it does to the acoustics of it.

Yeah, rock will liven it up and reflect but I gotta' get after the guy for not finishing the walls, the rest of the house is magnificent! I know, a man has to do.....

**analog addict** · July 26th, 2012, 10:53 AM

Originally Posted by westend9

Yeah, rock will liven it up and reflect but I gotta' get after the guy for not finishing the walls, the rest of the house is magnificent! I know, a man has to do.....

Well, the 1600+ sq ft of basement is counted as unfinished space on the tax record, so adding sheet rock really wasn't in the plans to start with. Plus as Tom mentions, I think leaving the insulation exposed helps deaden the room. Besides, it's a Man Cave. It has a commode and pro popcorn maker, but no TP, Alcohol sanitizer and paper towels, but no sink. It was designed to be unattractive to members of the fairer sex.

Anyway, back to the original topic. I've looked up the N500F here, but I don't have any 15067s, nor does this have a schematic. Is Steve Schell still around? He apparently has a schematic for an early N500A, which I'm guessing is close to what I want. Anyone else know a source for a similar late 40's early 50's N500?

**VolvoHeretic** · July 26th, 2012, 11:13 AM

Originally Posted by analog addict

I think leaving the insulation exposed helps deaden the room.

Better get some burlap and I wonder if that would even help. Fiberglass is as nasty as it's name implies. I have a hard time understanding why it isn't banned along with asbestos. The problem with fabric coverings is that they burn like gasoline.

**bowtie427ss** · July 26th, 2012, 11:24 AM

but I don't have any 15067s,

You looked at least a half dozen or so in the eyes while you were here. Lemmee know if you go that route, i can hook you up.

Anyone else know a source for a similar late 40's early 50's N500?

Ebay, where they average around 500 a pop for singles. You'll either have the good fortune of crossing paths with one in the wild(which could take way too long), or build a facsimile.

Aren't those early networks a "series" topology?

Considering the resources available to you, why don't you have one built yet?

Fiberglass is as nasty as it's name implies.

I understand some people have a nasty intolerance for glass. I remain thankful that i'm not one of them, as it's the best speaker damping material and home insulation available to mortal men. It's also great for controlling room acoustics.

**LICORNE** · July 26th, 2012, 12:30 PM

You are in for a shock . Look at this 1930 add.

http://www.lansingheritage.org/image...lletins/7a.jpg

**Alien_Shore** · July 27th, 2012, 12:57 PM

Originally Posted by analog addict

It was designed to be unattractive to members of the fairer sex.

CLASSIC!

Firmly ensconced into the Altec Aficionado Club for Men!

**Altec Best** · July 26th, 2012, 02:26 PM

Originally Posted by bowtie427ss

I really think he needs a couple rows of par 64's across the ceiling in front of them, and maybe a couple pinspots in the back of the room focused just wide enough to illuminate the speakers themselves. Oh, and about 200 running feet of black backdrop to cover all the pink without undoing it's acoustic goodness. I'm afraid if AA sheetrocks that space, he won't like what it does to the acoustics of it.

Originally Posted by westend9

Yeah, rock will liven it up and reflect but I gotta' get after the guy for not finishing the walls, the rest of the house is magnificent! I know, a man has to do.....

Yup I'm with you on this Westend... Just the sight of that insulation breaks me out in hives !! I couldn't hang for long with all those fibers running amok !

Love the speaks though AA ! Just beautiful...

**analog addict** · July 27th, 2012, 12:57 AM

Originally Posted by LICORNE

You are in for a shock . Look at this 1930 add.

http://www.lansingheritage.org/image...lletins/7a.jpg

Heh, 14 lb crossovers? Nice if you can swing it. 12 db per octave, crossed over at 500Hz. I need to figger out how to determine the impedance, since I'll have 20 ohm woofers in parallel and a 20 ohm compression driver

The fiberglass doesn't bother me at all. Only if I handle it with bare hands for protracted periods of time does it bother me.

**tomt** · July 27th, 2012, 02:42 AM

Originally Posted by analog addict

I need to figger out how to determine the impedance,

since I'll have 20 ohm woofers in parallel and a 20 ohm compression driver

thats so easy now.

Passive Crossovers, Capacitor and Coil Calculator

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adam west will always be batman to me -

1?961

**Altec Best** · July 27th, 2012, 01:33 PM

Originally Posted by analog addict

I need to figger out how to determine the impedance, since I'll have 20 ohm woofers in parallel and a 20 ohm compression driver

The fiberglass doesn't bother me at all. Only if I handle it with bare hands for protracted periods of time does it bother me.

True AA, but you don't want to be breathing in those tiny fibers either for long periods of time...

Ok so if you have them in parallel then the woofers impedance should be halved 10 ohms.. If you have an 8 ohm compression driver it would make it much easier to match.. Not a big issue though.. This is for car speakers but the application is the same for home speaks as well..

Series Parallel Speaker Impedance