Hello--------
This is my first posting on the Klipsch Forum.
Bob Crites asked me to check out the Jensen
query, so here's what I wrote to him before joining
the forum this afternoon-------
And please be aware that I'm not "shouting"------I write in caps a lot because i'm lazy; I'm trying to break that habit starting today-------
"
> HI, BOB--------------10:38, 27 MAR, 2004
>
>
> I'LL REPLY IN DETAIL THIS AFTERNOON/EVENING, BUT A FEW QUICK OBSERVATIONS NOW-------
>
> THE TWEETER'S LOW, 'CAUSE THAT'S THE ONLY WAY OUT-------IT'S FIRING OUT THRU THE BASS REFLEX PORT---IDEALLY, TURN THE CABINET UPSIDE DOWN FOR BEST LISTENING!!!
>
> THE WOOFER'S ACTUALLY A COAX---------5-INCH CLOSED-BACK "TWEETER" MOUNTED IN FRONT OF THE WOOFER-------------ONLY GOES TO ABOUT 11K---IF
> YOU'RE LUCKY---THE WOLVERINE T35 IS A GOOD CHOICE, EFFICIENCY & SOUND-WISE............THE "450-600 OHM" TRANSFORMER HAS BEEN DONE AWAY WITH--THE CONTROL MOST LIKELY AFFACTS THE T-35 NOW.
>
> THE CABINET SHOWN IS ABSOLUTELY TOP CONDITION--IS THE OTHER EQUAL??
> NOT CUSTOM-MADE----WAS A STANDARD JENSEN PRODUCT........
>
> SEE YOU SOON,
>
> CHEERS,
>
> STAN
Now, I can go for more detail-------
In my 1947 & '48 Allied Radio Catalogues, as well as
a lot of the old Jensen lit I have, the 15-inch
coax is either a JHP-52/$47.04 or a JAP-60/$55.53;
the cabinets may have been a special-order item from
Jensen, as they have a real stock-number--ST-600.
The speakers are in both catalogues, the cabs aren't in
either.
An interesting note about the "Roll-off" high freq control; as you'll note, the system is spec'd at 450-600
Ohms. Many consoles and amps of the day had 500-Ohm outputs available, and the high-freq 4-step control selected one of four secondary taps on the transformer always mounted on these speakers, as well as on the HNP-51
coax sometimes used; the differing inductances of the various taps in conjunction with a few caps gave differing freq response at the crossover point---around 5K. These networks were abandoned in 1949 in favor of a more simplified and effective design. As you may know, 1948 saw the intro of the Columbia LP with its extended freq-range and quieter surfaces; the 4-position Jensen control was a rather sophisticated way to reduce 78 RPM record-scratch; a problem overtaken by history. Also, wide-range live music
broadcasts on FM were becoming popular, and demanded new and more accurate speaker technology; for an interesting pictorial on older-but-newer Jensen products, check this site out I discovered last year---and I've been Jensen hunting since 1949! I have no idea who the kind soul is who posted it or when, but my sincere thanks to whomever he may be!!
http://www.hifilit.com/hifilit/Jensen/Jensen.htm
Cheers to all
Stan Ricker, A Jayhawk-62!