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In Reply to: Building Keyboard Amp - Questions posted by RBS on January 11, 2007 at 12:09:44:
You're not going to have any midrange dispersion going from a twelve to a tweeter. They may look good on-axis by they'll beam above 1.2kHz. Go 3 way. Also, go vented. The same mechanism that limits excursion with a sealed cab also kills bass response, and you'll end up with less headroom as it will take twice the power to achieve the same output below 100 Hz.
Follow Ups:
nt
You forgot the hernia.
And I'm building a single manual spinet chop comprising three chunks, none of which is over 50-60 lbs. A real Hammond that you can carry upstairs by yourself (without superhuman strength or a team of chiropractors.)
Back in the 90's we had a guy with a full size B3 and it was
a 1957 blonde he got from his uncle
Heres how we carried this thing
He purchased two 8ft hand rails (the round dowl type) from a
lumber yard
We stuck a hand rail under each side of the B3 and the legs would
keep them from slipping out the sides
Then four of us would take a section of hand rails on the different
sides and we picked this thing up and carried it
You should have seen guys carrying this thing up and down stairs
as it slid around on the hand rails
UNREAL...we all vowed NEVER again after that stint
The guy finally purchased some dam dollies for the thing
300lbs for a B3Cant beat the sound but the saying is...
"I aint liften that thing"Even in a B3 dolly/cradle with castors
nt
Thanks for your expertise Bill. Vented it is then. I had also toyed with the idea of adding a 6" mid driver to this box. I was persuaded to shelve that idea because all of the commercially available amps use a 12 or 15 with a piezo tweeter. I guess that's one of the reasons they don't really cut it.Any experience with b&c drivers?
Thanks for you thoughts
Bob
B&C is a good driver and so is BeymaI have a pair of montiors with B&C 12" cones and 1" compression drivers
Save yourself alot of grief and go with a compression driver instead
of a peizo
Peizos are great for repelling rodents and bugs but suck for
decent pro audioIMHO
You can go with a small 1"horn and driver with a 12"My only question is with the bandwidth a keyboard uses why would
you want to go with a 12" driver (unless your counting on the mains
to produce your low end) instead of a 15" loudspeaker to give
you more of a full range sound?You can get some decent Emminence compression drivers and horns
at a reasonable price at
"I was persuaded to shelve that idea because all of the commercially available amps use a 12 or 15 with a piezo tweeter."Not from JBL, EV, EAW, Martin or any other builder of quality products. While there's absolutely nothing wrong with piezo tweeters properly employed [I prefer them myself, but I only use them vertically arrayed] a cab that matches a twelve or fifteen and one piezo, or a few horizontally arrayed, is a piece of junk.
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