Find great deals for JBL M Stereo Mono Variable Crossover Rack Mount. Shop with confidence on eBay!. This crossover was rack mounted and is in good working condition. New lower price!. Please add the letters JBL behind part numbers when ordering. Page 3. JBL M Page 4. JBL M Page 5. JBL M Page 6. JBL Page 7. JBL

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Thats older tech, and not as clean as the better designs of today. You will also want to have the silver contact wafer switches cleaned. The spec is to crossover at Hz – but if you are worried about the diff between and Hz, you might want to use a scope and sig gen to be sure of the setting accuracy of your front panel controls Came running from down the hall, thanks Grumpy!

All times are GMT You could use silver mica disc caps, said to be superior.

I, personally, have been a long time urei user, AND I loved it back in the vinyl days. IF you increase the output gain, there are thru holes for additonal disc capacitors in the quad IC feedback loops, stock units have four 33pf caps, and two for the last TLO84 IC, upgrade by adding the additional caps in the the trhu holes already provided, same value. Have you seen Bo’s comments on his system? LF summing combines both channels for subwoofer applications where only one mono channel is needed.

Outstanding dB dynamic range for lower noise, greater headroom, resulting in unparalleled transient response. If you have vintage jhl, that are less highly resolving, you might like the coloration the produces.

Another thing to point out, is that although the Urei can produce what I call a charming sound, hit it a bit too hard, you will hear the IC,s distort.


During start up jb, initial surge current ubl be higher jbll the much larger capacitors, which could potentially over load and fry the original rectifier diodes. Greetings- I ‘ve been using jl JBL M electronic crossover for biamping my s for m5522 the last two years and have been quite pleased with the results.

I mean, if you have an excellent tweeter, and your crossover point is hz, you want it to be hz, not hz, or changing drifting on jbll own. See the attached pic That’s what I’ve been doing so far in driving my ubl a bi-amp mode. XLR input and output connectors. If you would like to talk further on the pro’s and cons of the what I think are the ,s strong and weak points, please feel free to PM me, I am happy to try to help!

I would anticipate an audible difference. Yet still another known problem, most ,s had waffle IC sockets, so, the IC plugs into the socket, and these can be intermittent. I presume it is HZ. Then, another thing to consider is the state variable filter frequency controls of the and output level attenuator pots. Originally Posted by Robh Extra Tabs by vBulletin Hispano.

The result is a system that delivers balanced power response across both the horizontal and vertical planes for superb coverage. All times n552 GMT As well as any frequency you desire can be dialed in, and the output level controls allow one to find those in between settings, unlike detented controls with their factory settings in 1DB increments.

Seeing as that was almost a decade ago, I wouldn’t wait up for a reply.

JBL M552 Stereo Mono Variable Crossover Rack Mount

Outstanding dB dynamic range for lower noise, greater headroom, and unparalleled transient response. But, it is coloration, for sure.


By glen in forum Lansing Product General Information. With just about EVERY speaker I, and my friend, who also does commercial audio, we just find 18db Butterworth filters allow us to create a much more seamless sound with 3 way or 4 way active setups. RF filtering to defeat extraneous noise and ultrasonic oscillations.

Originally Posted by wpod.

Advice on JBL M crossover

The time now is Thanks for your kind reply. If you have an RTA you can use that to determine where you are. Another thing, is while I still do love the sound of theI love it with certain speakers, and NOT with others.

Servo-balanced outputs provide automatic output level adjustment to accommodate either balanced or unbalanced feeds. Combines four independent channels of noise gate in a compact one rack space chassis. DSP crossovers also have the option of selectable filter types as well. Model SC8 Security Cover.

IMHO, a “WORKED ” Ureiin the right system, can make some enchanting sounding vinyl playback, but, I’m telling you the known problems of the unit, as well as the fact that I feel that sound can be, and has been surpassed today, especially for digital playback of Cd and downloads. All four devices incorporate Servo-Balanced outputs for proper gain matching and elimination of extemporaneous noise.

And I am basing this value solely on the estimated reduction of the power supplies ripple voltage. When dramatically increasing the size of the power supply capacitors, it is certainly a good idea to also increase current handling capacity of the rectifier diodes.

Originally Posted by pyonc.