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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The time now is There is a row of yellow “Century” brand caps, I think these are film caps, and they can be upgraded to a better quality cap, will make an audible and positive difference. 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.

Sometimes, its a bitch getting the EXACT setting you had when you futz with the trying to dial it in to sonic perfection. Originally Posted by pyonc.

Originally Posted by wpod. Extra Tabs by vBulletin Hispano.

JBL M Stereo Mono Variable Crossover Rack Mount | eBay

However, I have moved on, to bryston, and I havent looked back yet. 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. Thanks for your kind reply.

Came running from down the hall, thanks Grumpy! LF summing combines both channels for subwoofer applications where only one mono channel is needed.

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 Ubl distort.

JBL M552 Stereo Mono Variable Crossover Rack Mount

Fantastic power supply, discrete circuitry, and high quality components, with superb engineering at jhl here.


Gain, both input and output IC feedback loop resistors should be changed m5552 increase available gain, how much is the question! The bottom line is that you want to sum flat through the crossover point so 50Hz on either side on the dial doesn’t really matter as long as you are flat through the transition. Then, another thing to consider is the state variable filter frequency controls of the and output level attenuator pots.

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Power supply, mfd axial 25v caps stock, good to upgrade to an axial mFd 50v cap, there are three to replace. Of course, 24db slopes, m525 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. I just want to double check with you on this.

So, jbll knowing what amps, and speakers you have, I dont know what I would tell you as my 1 m5552. All times are GMT I mean, if you have an excellent tweeter, and your crossover point is hz, you jvl it to be hz, not hz, or changing drifting on it’s own. 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.

I, personally, have been a long time urei user, AND I loved it back in the vinyl days. Thanks a lot for your feedback and advice. This flies in the face of current engineering trends mbl practices and is to some, highly questionable, but, n552 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.


Wide bandwidth, flat response; 10 Hz to 40 kHz. Still would be biamping? So, if you are going to change the caps, then change the diodes as well.

XLR input and output connectors. Extremely low distortion; THD 0.

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! Earliest JBL crossover with hi-frequency level control? Outstanding dB dynamic range for lower noise, greater headroom, and unparalleled transient response. You will also want to have the silver contact wafer switches cleaned. I have found that although my modded ,s have an enchanting sound for analog, vinyl playback, it is NOT always the best when it comes to playing CD.

If you see the pic, I currently set the crossover at the center bar, namely between and Based on the schematic, its quad op amp circuits – generally called negative feedback design. 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.

M Four Channel Noise Gate. The manual Link above is copyrightwhich makes them year old gear. 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!