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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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If you can get one cheap and spend some money to clean up the power supply caps and such, its probably fine, but if you want to upgrade from what you have – there are better crossovers around.

M Four Channel Noise Ibl. Power supply, mfd axial 25v caps stock, good jbp upgrade to an axial mFd 50v cap, there are three to replace. Gain, both input and output IC feedback loop resistors should be changed to increase available jlb, how much is the question! I would anticipate an audible difference. If you don’t have an RTA just go with what sounds best to you. Extremely low distortion; THD 0. See the attached pic That’s what I’ve been doing so far in driving my in a bi-amp mode.

High visibility 8-element LED metering.

Complete user control over Threshold, Attenuation, Attack and Release controls. Servo-balanced outputs provide automatic output level adjustment to accommodate either balanced or unbalanced feeds.

The time now is Originally Posted by Robh I, personally, have been a long time urei user, AND I loved it back in the vinyl days.

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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.

Wide bandwidth, flat response; 10 Hz to hbl kHz.

I do not like 24DB slopes. The other thing about 24db slopes, is they are acoustically in phase at crossover point, 18db is considered out of phase at crossover point.

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Jbl M vs JBL/UREI crossover

I just want to double check with you on this. I would have a tech solder the IC,s directly to the boards IC pinouts, or you can do it yourself if your handy with a soldering iron!

I just am not totally into digital crossovers at this time, but, at some point, I feel they will get it to the point where I believe digital crossover filters will become indiscernible, sonically, from the best analog filters. LF summing combines both channels for subwoofer applications where only one mono channel is needed.

Came running from down the hall, thanks Grumpy! This flies in the face of current engineering trends and practices and is to some, highly questionable, but, we find the sound between the ranges to gel together seamlessly, and eminate as ONE using 3rd order butterworth filters, BUT higher order slopes 24db, 36db 48db, etc produce a sound that to our ears, make the ranges BASS, MIDRANGE, HIGHS sound like they are sparate from each other, and lacks the seamless image I consider natural sounding.

Thanks a lot for your feedback and advice. 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 it’s own.

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.

Originally Posted by pyonc. Another thing to ibl out, is that although the Urei can produce what Jgl call a charming sound, hit it a bit too hard, you will hear the IC,s distort. If you find a mintI will be more than happy to pass modification info to you, and whatever k552 you want, to achieve the best you can get from the 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.

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M Series Brochure Adobe Acrobatkb. Without having ever seen a urei schematic, upgrading from 1,mfd to 2,mfd caps should reduce the hum level by about 6. But, 18db Butterworth sums flat at unity, which I think sounds nicer. The result is a system that delivers balanced power response across both the horizontal and vertical planes for superb coverage.

Sometimes, you lose the output on ch 1, ch 2, ch 3, etc, and jl tap obn the faceplate brings it back. TODAYS top quality crossovers, like Bryston, have selectable slopes, and the dsp crossovers m5522 6,12,18,24,36,48, and 52 db slopes, as well as one dsp unit having db brick wall linear phase filters available. That is a known problem with the What do you think?

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There is a row of yellow “Century” brand caps, I think these are film caps, and jbll can be upgraded to a better quality cap, will make an audible and positive difference. Advice on JBL M crossover. Yet still another known problem, most ,s had waffle IC sockets, so, the IC plugs into the socket, and these can be intermittent. Extra Tabs by vBulletin Hispano.

During start up the initial surge current will be higher with the much larger capacitors, which could potentially over load and fry the original rectifier diodes.

Better than dB unweighted. Still would be biamping? Gate function with independent Threshold control for each channel. The manual Link above is copyrightwhich makes them year old gear. Of course, 24db slopes, and higher, allow higher power to be used for compression drivers and tweeters, but, unless your doing HIGH POWER commercial sound, I don’t think this is a problem for you.

Wide bandwidth, flat response; 10 Hz to 75 kHz. If you have vintage speakers, that are less highly resolving, you might like the coloration the produces.