Electro Voice 12TRXB...

67tony

67tony

Active Member
This question will probably set a record for newbieness:

What are the ramifications of these speakers being 16 ohms as opposed to the usual 8 ohm system?

There's a pair near me for reasonable money, and I've always wanted to build cabinets. Should be a snap with only one driver, but I'm wondering what size or shape enclosure to create. Also, will they sound decent enough with ss power as opposed to tube? They are a 3-way driver with a built in crossover, and apparently are the same units used in the old Electro Voice Aristocrat speakers.

Any comments, as usual, are greatly appreciated!
 
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Should be no ramifications about impedance, especially if using SS gear. This literature lists a maximum power handling of 40 watts.

I wonder how this driver would do in a T-Lne enclosure. In that same product information, it states 35-40 hz at the bottom end but a T-line or even a reflex cabinet may get some more usable bass.

There are some guys, here, that know a lot more about the EV triaxial. Hope they chime in. Good luck with your cabinets.
 
Thanks, westend! I've looked at a couple site that specialize in full range drivers, and they sure do have some unusual T-Line cabinets!

These particular EV drivers (12trxb) do not seem to be very prevalent, though, and so far I have no idea what style or size cabinet to build. Baffled and ported, probably, but even though I am confident in my woodworking skills I am a complete newbie when it comes to the technical aspects of quality sound.

If anyone has any thoughts on a cabinet plan for these EV 12TRXB's...I am all ears!

:music:
 
The 16 ohm impedance means that a solid state amp will deliver only half its rated power. That sounds bad, but isn't, because these drivers are hugely efficient - you don't need more than a hand full of watts.

The "double the impedance, halve the power" rule doesn't apply to conventional tube amps, or the handful of solid-state amps that use output transformers / autoformers - for them, rated output power stays the same.

The few tube amps that don't utilize output transformers usually double their power when impedance doubles.
 
Thanks, mhardy, that is a great link/bulletin and just what I am looking for!

And frperdurabo, nice job putting your explanation into layman's terms. I am learning a lot, but am still about a 2 out of 10 technically speaking.

(P.S. Is $75 about right for a pair of EV 12TRXB's in good shape?)

:music:
 
I had a pair of 12TRXB's and built cabinets for them. Great sounding speakers and extremely efficient. I have some documentation, specs and enclosure building information on them. If you PM me, I will e-mail them to you.

Edit...Never mind, the same documents are on the link that was sent to you in an earlier post. That graph will give you the port size, clearance and length for a given enclosure size. Works really well.
 
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I got that from our friend Toasted Almond, if memory serves (or possibly Tentoze) - when in doubt, I cite all possible sources - as the consequences of retribution are just too horrible to imagine.

;-)
 
He is all T&A that one. The things are listed as triaxials and there might be a bit more mid range in them that typical EV drivers of the same vintage. They came in the old brown baskets and in the white cast aluminum but are basically the same thing. Any speaker with a tweeter in the middle and an Lpad hooked to the tweeter was a Triaxial Speaker, but they are really just adjustable 2 ways. Pioneer even made them when they were building tube gear.There is an L-pad connected to the tweeter which is from the outside looks a T-35 which because the world is funny a single T-35 tweeter is worth more than a pair of the Triax with one in the center. You won't get much over 15K that means anything and unless you have a tuned pipe the bass is nothing to brag about.
These were found in Aristocrats because lots og guys couldn't afford the woofer, mid horn and tweeter and maybe didn't want to even go for the lower end Wolverines Which for the mid horn and tweeters just had smaller magnets.
I have a pair of the old one out in the garage and there is nothing wrong with them and nothing great about them. They reflect the time and what people listened to which was symphonic or easy listening for the most part. C&W listeners tended more for the consoles as systems. What I found in small town Texas in around 72 when everyone had 8 tracks in their cars and rock was only on the AM on the radio in middle America.
Not sure you will like having just a single unless your other speakers are as highly efficient. You can pop the VC out with 20 watts and a transient that get 60 out for just a second. You might try it out with a t amp pulled out of a computer speaker that has a built in amp and go mono off the puter for a while. Just do something to get it upright like a string from the ceiling. Pull the speaker out of a powered one and solder speaker wires to the outputs of the puter speaker and plug it into your sound card. It might give you a better idea of what it sounds like without the worry of blowing it out.

Thatch
 
Free enclosure for the 12trxb; local pickup

mhardy6647 said:
There are zillions of 12TRXBs floating around out there (look on eBay sometime).
EV recommended bass reflex enclosures
http://archives.telex.com/archives/EV/Builders Plans/Bulletin10A.pdf

Folks have used them on open baffles and in (big) TQWTs.
Unfortunately, last time I looked, Terry Gesauldo's page had gone Tango Uniform :-(
Click to expand...

Following the electrovoice bass reflex enclosures manual, I built a 12trxb enclosure. It weighs 80 pounts and is 5 cubic feet in volume. I have an aristocrat cabinet now and no longer need such. Just pm me and arrange for pickup in SW suburbs of chicago
 
cancel that

backmd said:
Following the electrovoice bass reflex enclosures manual, I built a 12trxb enclosure. It weighs 80 pounts and is 5 cubic feet in volume. I have an aristocrat cabinet now and no longer need such. Just pm me and arrange for pickup in SW suburbs of chicago
Click to expand...

addendum:
Just got another 12trxb and have to resurrect the cone, but will use the bass reflex cabinet
 
Free bass reflex enclosure for Electrovoice 12trxb

Just got an Aristocrat enclosure and no longer need the 15,000 cubic inch bass reflex enclosure. Following the electrovoice bass reflex enclosures manual, I built a 12trxb enclosure. It weighs 80 pounts and is 5 cubic feet in volume. I have an aristocrat cabinet now and no longer need such. Just pm me and arrange for pickup in SW suburbs of chicago
Free pickup in the chicago area, just pm me.
 
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Recently picked up a set of EV Marquis speakers, which have the 12TRXb drivers. One of them is pretty shot -- cone is all cracked up.

Doing some searching online, I'm seeing the red/brown metal basker version (which is what I have), the the white basket version with the orange-ish sourroud.

Beyond the cosmetic differences, is there anything else different? The white baskets are clearly maked "16 ohms", but the brown braskets have no mention of impedence at all.

Could I mix a red-brow basket in one cabinet, and a white one in another? or do the red-brown baskets have an impedance of 8ohms, and I should have two matching drivers in my cabinets?

Thanks!
 
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