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full-range drivers

67tony

67tony

Active Member
The Electro Voice 12TRXB full-range drivers I had my eye on got snatched before I got there, for $75.

Are there any other 3-way full-range drivers that I could look for in this price range? I'd like to build a basic enclosure, and thought a full-range driver with a built-in crossover is a good start.

Also, how is an "open-baffle" enclosure different from a "bass reflex" design?

Thanks!
 
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Open Baffle is just a sheet of wood, standing up on one end, with a driver in the middle.

Bass Reflex is a sealed cabinet where the woofer bounces back off of a 'cushion of air' inside of the cabinet.

There are a bunch of other Electrovoice drivers but they aren't exactly cheap. I myself like the 12TRXB (because I have one in a corner horn) and the Wolverine. Look up Electrovoice on Ebay just to see what's out there and what's available. It's a pretty interesting search IMO.
 
SP12TRXB isn't really a full range - it's a coaxial, a bass speaker with a central tweeter. Utah made something similar, called the "Celesta," that doesn't go for big bucks. There's also the University Triaxial, which is a bit pricier.

There are also wide-banders in that size: The EV SP12, SP12b, the University Difusicone, etc.
 
I love the old Philips and RCA AlNico drivers. You can sometimes find them in excess of 12 inches. I'd love to build a pair with those drivers some day.
 
The EV Wolverine LT12 and Michigan MT12 are similarly three-way coaxial drivers (woofer, whizzer for midrange, and compression tweeter) that are somewhat less common but were - and still are - less expensive than the 12TRXBs tend to be on the open market. Soundscraftsmen also sold a beautiful OEM version of the LT12 with a golden-colored basket. I have a pair of LT12s (one branded Soundscraftsmen) and I quite like the way they sound. Qts of these drivers is high; they'll be quite happy on open baffles, although EV recommended - among other things - large vented cabinets for them. You are familiar with EV Bulletin 10A, no? If not:
http://archives.telex.com/archives/EV/Builders Plans/Bulletin10A.pdf

Other manufacturers had similar drivers - There was a University "Mustang" driver that was quite similar to the LT-12 (before EV and University had been merged together); Jensen and University had other "three-way" coaxial drivers at myriad price points. Take a look at late 1950s/early 1960s catalog scans at www.radioshackcatalogs.com to see some of them.

HTH, as they say.
 
RamblinE said:
Bass Reflex is a sealed cabinet where the woofer bounces back off of a 'cushion of air' inside of the cabinet.
Click to expand...

The above description is more that of a sealed enclosure, often called "acoustic suspension", although that is not completely accurate.

Bass reflex is an enclosed volume of air and a tuned "pipe" that act as a Helmholtz resonator, thus reinforcing certain bass frequencies.

http://en.wikipedia.org/wiki/Bass_reflex

az
 
I once scored a pair of University UCX-123 tri-axiel drivers for $60.
The pair of 9 cubic foot Allied speaker cabinets that I put them in, cost me $40.....and a 4 hour road trip.

Steve
 
RamblinE said:
:( I get the two confused.
Click to expand...

Here ya go. With Acoustic Suspension the speaker is 'suspended' on a pillow of air in the box. With Bass Reflex the bass 'reflects' off the back of the box and out the port hole. Yeah I know this is not really what is happening but it gives enough of a mental picture so that I don't confuse them.
 
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