New Behringer XO/EQ
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Sure looks like the real deal! It's only a matter of time and this type of unit will be mainstream, in one form or another. I wish it was offered with RCA connectors instead of XLRs, tho.
Pete- Bottom
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ThomasW says this is something that I need.... unlike a screen door on a submarine! :W
Actually, it looks like it would be a very intersting development tool, even if the sonics aren't ultimate class. However, from their descriptions it's likely it uses a Cyrstal CS8420 as the sample rate converter and input receiver for digitial, and it's highly configurable, with a lot of configuration options available. Just the ticket for development projects/experiments with dipole systems, multi-way systems of all types, etc. Not "cheap", but a lot of stuff for the bucks. The balanced inputs and outputs are a nice touch- and mandatory for Pro applicaitons- which is what this is really developed for. However, with 113 dB dynamic range, performance should be pretty reasonable.
Jon and Thomas give it a one thumbs up and one sideways... he's undecided! :LOL:
Also on the Behringer list, but much more reasonably priced, is the Behringer CX-3400 Analog electronic crossover- street price in the $129 to $159 range.
A bargain at it's price.
-Jon
Earth First!
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Dennis,
Wow, this looks like this exactly what I need! I just built a Stryke AV12 sub and was looking to put together an LT/equalizer, a Marchand XM1 crossover, and a 24/96 or 24/192 DAC by the end of the year, but I didn't want to deal with the circuit construction. Thanks for the link!
Does anyone know whether the XO on the DCX2496 has both a LP and HP filter? I'd like to high-pass my SCH K05B50s at around 100 Hz or so, and though I took a quick look through through the manuals of both the CX3400 and DCX2496, I couldn't figure out whether either unit had both 4th order LR low-pass and high-pass filters, or just a low-pass filter. Any ideas?
Peter- Bottom
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I downloaded the software and it has highpass and lowpass filters, 6 - 48 dB, for each output. Delays, digital gains and EQs (bell and shelving) for each input and output. One thumbs down is no analog gain adjustments, same as previous Behringer digital units. Full digital zero for the ADC and DAC is about 10 analog volts (22 dBU) so you could be throwing away bits of resolution if you run it with typical consumer gear upstream and downstream.- Bottom
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There are a few units out there with this kind of capability, although the Behringer is the cheapest one. I have the dbx Driverack PA, which doesn't include the AES/EBU input, but does have automatic room EQ.
I used to own a Behringer Ultracurve, and the A/D section of the Driverack seems to be superior. I've had no problems with quanization noise at low input levels, wheras on the Ultracurve I did get a bit of 'burbling' on quiet bass passages.
Of course, the new Behringer appears to have improved chips so this may be moot. I really like the fact that you can choose to make it a three input biamp crossover. This would be ideal for dipole center and surrounds, with the EQ... hmmm, might call www.zzounds.com!
BTW, I have the cheap Behringer xover mentioned above. It is a very nice unit too.
Steve
Steve's DIY Dipoles- Bottom
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Anyone have experience using digital crossovers for dipole systems and their required equalizations? My experience with the Rane RPM26v is that programming the necessary (large) amounts of equalization for woofer outputs quickly clips the internal circuitry. Solveable by reducing the input greatly, but that's not a very good option. This may just be an architecture problem specific to my unit since the analog level controls are downstream of the DSP. I added the required equalization outboard, but it would have been nice to avoid this.
I noticed on the block diagram of this new Behringer unit that the level adjustment in each leg comes before the equalization block. This might alleviate the problem somewhat.
I was wondering about experiences with other units like the Driverack, Behringer, etc.
Thanks,
Davey.- Bottom
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That's exactly how I use my Driverack PA, as a three way crossover and EQ for my dipoles.
I haven't noticed either by ear or by clipping indicators any problems.
Steve
Steve's DIY Dipoles- Bottom
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The Driverack is very flexible, and I've just changed the bass drivers so I am still fiddling, but here are the current settings.
The bass has a 12dB shelving filter with a 6dB per octave slope, maximum gain is set at 25Hz. I also goose the 20Hz region just a tad with an overlaying filter.
The midrange has a 12dB bell filter with a Q of 2.03 and center frequency of 150Hz. I also have a notch filter on the midrange at 5kHz.
I don't use any EQ on the highs.
Crossovers are at 100Hz and 1400Hz, all 24dB Linkwitz Riley. I also am playing with a 20Hz 12dB filter to limit excursion.
The bass and treble are run at 0dB and the midrange at -11dB, and the midrange and treble are delayed by the appropriate distances to match the acoustic center of the bass drivers (.12 & .14 metres).
On top of this I use the Auto room EQ feature to EQ each speaker individually to a flat setting, although I flatten the EQ above 5kHz. Each time I move the speakers I redo the room EQ.
Cheers
Steve
Steve's DIY Dipoles- Bottom
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I think these discussions are interesting and valuable.
The one thing that really bothers me about digital preamps or digital crossover/EQ's is the overall architecture, in the sense of optimizing the dynamic range.
A common problem I believe arises if one is using a preamp volume control before the crossover/EQ unit, and no gain modification afterwards. Then, unlike CD's or SACD's, you have a situation where for "normal" listening at moderate to low levels, you're throwing away 20 dB or more of your dynamic range. This would be even worse for larger systems. Imagine a system like my X1's, with a dynamic range of 115 dB or so. Now, I like listening at some pretty loud levels on some kinds of classical music, as well as occaasionally turning up a jazz or rock piece, but I also do a lot of listening not a lot above conversational levels- 75 to 80 dB. So, if the processor/crossover/EQ is optimized to not clip at max output of my system, it's going to be operating at 30 to 35 dB below max level most of the time. Now, most current so called 24 bit converters are really only 20 bit resolving in terms of analog noise and distortion- the newest segmented DAC architecture from TI/Burr Brown will use an unusually high reference and 10V output level, in order to hit 21-22 bit resolution. Throw away 35 dB of "bits" from the other best conventional converters, and you're left with a S/N+distortion range of no more than 80 dB- not quite 14 bit resolution. Not much point in running your high res upsampled CD's or SACD disks through that, is there? Or isn't there? It's hard to say, because the room noise floor is well above the converters still. However, digititus may be creeping in, and that *may* be audible. Or not.
Things to think about. And experiment with. The shortcomings of most 16 bit digital systems are obvious to the degree that we aren't usually really getting 16 bits of "quality" out of them. Part of the benefits of SACD and DVDA are that with the extra bits, even if it isn't all done as well, it can be pretty good at a more reasonable price. There's evidence that 16 bits done REALLY well will sound better (at least slightly) than an average job of doing 24 bits- but the latter can be done at as little as 1/10th the cost....
My brain hurts sometimes, thinking about these things....
Best regards,
Jon
Earth First!
_______________________________
We'll screw up the other planets later....the AudioWorx
Natalie P
M8ta
Modula Neo DCC
Modula MT XE
Modula Xtreme
Isiris
Wavecor Ardent
SMJ
Minerva Monitor
Calliope
Ardent D
In Development...
Isiris Mk II updates- in final test stage!
Obi-Wan
Saint-Saëns Symphonique/AKA SMJ-40
Modula PWB
Calliope CC Supreme
Natalie P Ultra
Natalie P Supreme
Janus BP1 Sub
Resistance is not futile, it is Volts divided by Amperes...
Just ask Mr. Ohm....- Bottom
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I've been thinking about the resolution thing too. One way around it, for a stereo 3-way system, might be to run the digital signal from the transport right into the XO. Assuming the DACs of the XO were decent, you could control the volume downstream with a 6 channel analog volume control. Something like the Sony 5.1 analog preamp might work pretty well with its remote or you could probably cobble together a 6-channel passive attenuator.- Bottom
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Dennis,
That's how my setup is configured...although I don't have a digital input on the crossover. I connect my CD player analog outputs to the Rane RPM26v inputs via a small op-amp amplifier. I've adjusted the gain setting on this amplifier to yield the highest signal level possible passing through the crossover and then I use my Sony TA-P9000ES six channel preamp to control all six of the outputs for my triamped Linkwitz speakers. A six channel passive attenuator would still yield plenty of signal level, but I haven't gotten around to building one of those yet.
Davey.- Bottom
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The problems with dynamic range or quantization noise were apparent with the Behringer Ultracurve, but have not been with the Driverack. My old TACT was fine as well.
The ideal solution would probably be a prepro like the Merdian 561 which has digital outs on all channels, with a digital crossover with digital ins on all channels. Rather pricey though.
My only question about the resolution question is how audible it would be given the volume levels involved, and the ear's sensitivity at low levels.
Steve
Steve's DIY Dipoles- Bottom
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Dennis and Davey,
I think you've hit on what is most likely the optimum architecture- I just didn't know if anyone else would find it reasonable! It would ideally need to be a complete preamp crossover system, with input gain adjustments for different sources, to optimize the level into the ADC's, then all the processing, then another gain control system to set output level. The latter could be digitally controlled such as the way Crystal's and others have digitally controlled volume units, but not by DSP manipulation of the total number of bits going out to the main DAC's. Or, for those curmudgeonly among us, high quality analog controls, such as pasive stepped attenuators.
And unfortunately I've heard that Sony has discontinued their analog 5.1 preamp- what the hey are they going to replace it with?
-Jon
Earth First!
_______________________________
We'll screw up the other planets later....the AudioWorx
Natalie P
M8ta
Modula Neo DCC
Modula MT XE
Modula Xtreme
Isiris
Wavecor Ardent
SMJ
Minerva Monitor
Calliope
Ardent D
In Development...
Isiris Mk II updates- in final test stage!
Obi-Wan
Saint-Saëns Symphonique/AKA SMJ-40
Modula PWB
Calliope CC Supreme
Natalie P Ultra
Natalie P Supreme
Janus BP1 Sub
Resistance is not futile, it is Volts divided by Amperes...
Just ask Mr. Ohm....- Bottom
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Jon/Dennis,
I don't know if you receive Audioxpress magazine or not, but in the latest issue Dennis Colin has built a six channel level control system for his HT system using six Analog SSM2018T VCA's. This could be easily used for a global volume control in a system similar to mine. It looks to be a fairly nice design. Check it out if you can.
Analog SSM2160 is also an option.
Davey.- Bottom
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I have been looking at the digital XO's and EQ lately and will likely go with the Behringer or dbxDriverack PA.
Steve, how valuable is the Room EQ portion of the Driverack PA? Is it more important than the heightend control ability and digital inputs of Behringer DCX2496?
Davey, Dennis H. MSB does have a volume control that has 8 channels with separate trim control and comes with a remote control.
For a passive Volume control you may want to take a look http://www.hometheaterhifi.com/volum...ol-2-2003.html they did a write up of a kimber-dact Passive 6-channel Volume control which I think is a great piece. Now all you need to do is add some input selection and you a nice purist piece of audio equipment. Would adding the extra inputs necitate some type of power supply to control these inputs or give them more Voltage to adequately run the system to realistic volume levels?
Does anyone have a block diagram of the best to wire up a system using one of these digital XO/EQ's? I sure need one.
MI-II-CENTS
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The TailWind Generation I- Bottom
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