Update: The OMB converter did the trick and I am able to connect the DSP to my PC. Next up a more extensive measurement day.
Been quite busy the last couple of months, but had some time to play around with presets etc. While doing just that. I found out that filter implementation o the DSP adds some problems. When doing so, a lot of distorion is added to the signal. I have tested this with a pure 60Hz sine wave and a whole sweep on a sub and top cabinet. Both give the same results and problems. Some signal is getting superimposed on the output, but it does not grown in amplitude like the output itself when adjusting the gain. So at louder levels its less noticable.
I have reported this problem to OMB, and am waiting on their response/solution.
I have reported this problem to OMB, and am waiting on their response/solution.
Lets first wait and see what OMB does. Even the top manufacturers have problems from time to time.
So the whole OMB story did not get any better. They kept pointing at user error for my problem (which imho is quite impossible). To solve the problem, I would need to buy 5 new CQ380 DSP modules, which I am definately not going to do. That would cost me an additional 500 euros without even knowing they solved the problem. If anyone want to know more about the problems itself, let me know via here, or send me a pm. Have done some measurements to document the problem itself.
With this in mind, I really do not have much options left. I have four plate amps which are not really usable in their current state. Maybe I will salvage the amp modules themselves and build some 19" rack amps with them etc...
With this in mind, I really do not have much options left. I have four plate amps which are not really usable in their current state. Maybe I will salvage the amp modules themselves and build some 19" rack amps with them etc...
Yeah please share your measurements and elaborate more on what happened.
You can add external DSP also as last resort
Just a question does that happen with the DSP module inline even you have the DSP processing off via control panel
Or only happen when you enable the filters or EQ inside the DSP control panel
That gives us 2 posible options.... One is a DSP code bug that introduce the spurious signal when processing is on.
The other is actual analog stage design bug in the audio path so the parasite signal is present even you have all DSP processing off.
Either way OMB must stand behind their product and fix that. Otherwise OMB is junk
You can add external DSP also as last resort
Just a question does that happen with the DSP module inline even you have the DSP processing off via control panel
Or only happen when you enable the filters or EQ inside the DSP control panel
That gives us 2 posible options.... One is a DSP code bug that introduce the spurious signal when processing is on.
The other is actual analog stage design bug in the audio path so the parasite signal is present even you have all DSP processing off.
Either way OMB must stand behind their product and fix that. Otherwise OMB is junk
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It is not present without filters, so the problem is digital filter implementation related imho.
60Hz sine wave on input with no filters:
Same 60Hz sine, 30Hz HPF 24dB BW engaged:
An extra LF signal is superimposed on the 60Hz sinewave with varying frequency and even amplitude. This same signal is present without any input signal.
The same is happening on other outputs with higher set HPF's but not as much notable due to the frequency of the signal itself.
OMB won't fix anything and only want to sell me new CQ380's which i do not want anymore.
60Hz sine wave on input with no filters:
Same 60Hz sine, 30Hz HPF 24dB BW engaged:
An extra LF signal is superimposed on the 60Hz sinewave with varying frequency and even amplitude. This same signal is present without any input signal.
The same is happening on other outputs with higher set HPF's but not as much notable due to the frequency of the signal itself.
OMB won't fix anything and only want to sell me new CQ380's which i do not want anymore.
Good to know this problem.
I just wanted to buy two of them, as spares for existing Powersoft XPro-3 with Xilica DSP.
So I will wait until I have realy a need for new moduels.
I just wanted to buy two of them, as spares for existing Powersoft XPro-3 with Xilica DSP.
So I will wait until I have realy a need for new moduels.
Well, looks like the power amps without DSP on the OMB's work,
Options:
#1
Keep the OMB's and add external DSP
#2
Remove the OMB's and get some Sanway,CVR or Admark plate amps,
Modify hole as necessary.
#3
Keep the OMB's but
Convert the cabinets to passive, use external amps and DSP
#4
Remove the OMB's
Patch the hole in the cabinets and use them as passive with external amps and DSP.
What you like
Options:
#1
Keep the OMB's and add external DSP
#2
Remove the OMB's and get some Sanway,CVR or Admark plate amps,
Modify hole as necessary.
#3
Keep the OMB's but
Convert the cabinets to passive, use external amps and DSP
#4
Remove the OMB's
Patch the hole in the cabinets and use them as passive with external amps and DSP.
What you like
Did the 7# with photography, and it was bitter. Doing that with sound would kill me twice over. You really don't want to do that, especially when the last project sucked. You need to end when it's best, not worst. 🤭
New starts are a thrill because of the possible unknown. 6# looks great.
New starts are a thrill because of the possible unknown. 6# looks great.
How dare you say something like that 😆
@Crashpc
As far as the project itself as a whole, I am satisfied. The cabs did what I want, have had them used passive in the beginning.
But I want to go a bit smaller and probably tune a bit higher (around 40Hz) and go for something like the 18TBX100, PowerProX18 etc. It would give me some more flexibility and still stay flexible.
I just bought two 2-channel 2x650W @4Ohm modules from SenMicre with the QC160 DSP , they seem to have also a little problem with the DSP. You can hear different crisping noise from the tweeter (12"x12" Horn 1,4" throat and 2,5"VC 112db @1,5khz) and the noises change when you change the DSP setting from the woofer. It is not very loud but audible in living room conditions. I have to make a test outside if it is audible when normal power levels or full power is needed.
The QC160 DSP detects clipping only from the input signal, no matter what output voltage the plate amplifier produces.
The amplifier itself makes 53V @100Hz 8Ohm 230V mains and 52V @4Ohm, if you want more it starts to deform the sine wave.