Hi Minidsp

I have followed your trouble shooting recommendation without any success so I need to ask you to help me solve my problem. I have connected the dsp like this:

Marantz SR6400 (front speaker as large) => to minidsp =>Out3 och 4 to rotel RB06 (amplifier) further to front speaker => Out1 och 2 to nad (amplifier) further to subwoofers.

When I connect the minidsp simultaneuosly to my computer i only get input gain on channel 2. The level is following the volume knob but on a low level the gain is between -40 to -60. No response from channel 1. If I switch the input cables to the dsp I still only have response on channel 2. Output channel 1, 2, 3 and 4 are still dead. Therefore I don't get any sound from my loudspeakers. It doesn´t matter if the power supply is separate charger driven with 16V DC.

I have set all parametric eq in bypass mode. In system settings I have analog mode and subwoofer output tried both as mono and stereo.

The plug in is MiniDSP-2waySUBAdv-V1

Please help so I can start using this very interesting tool.

Hello,

Most likely a software configuration behind the reason here.

1) Make sure that you feed a stronger signal to the miniDSP. -40 to -60dB at the input isn't exactly optimizing the gain structure of the unit. If you have a revB, try changing to revA the jumper because you most likely don't have enough sensitivity.

2) Without any speakers connected to the outputs (i.e. turn off the amps), click on "Restore to default" while connected to the unit. It will wipe out the configuration and make sure you don't have an odd mute/configuration somewhere.

Finally, once you've performed all this and if you're still having some issues, you can send us your file for more investigation.

Hoping this info helps.

DevTeam

Hi devteam

Now I have made more investigations and unfortunately the problem still remains.

1. I have revA.
2. I have followed your recommendations to restore the settings to default without any cable plugged to the device and also with cables plugged between the device and the receiver, no change.

I have also tried another receiver (denon avr 2106) without any change.
I have also tried with two other DC power supplys (6 and 16V) without any change.
I have also downloaded the latest plug-in from february this year. Still no change.

With my latest tries today everything works like this (with factory settings of the plug-in):

Input gain at -70 to -74. Channel 1 is more steady (like -74) while channel 2 is more variable (-74 to -70).

On output gain it's like this. 1 and 2 are the ones that works the best. They are at similar level (there are at -70 to -75 if I don't forget). Output 3 is dead (infinity). Output 4 is more or less dead. I can hear some sound and the gain is between infinity and -110.

What can we do? I have tried two different plug-in in factory default settings "MiniDSP-2waySUBAdv-V1" and "MiniDSP-2waySUBAdv" without success. For some reason I don't think there is any problems with the sofware. What do you think?

@ Rullake,

Simple question, but in your setup, it doesn't sound like you're using an active speaker system for a 2way system (i.e. Low Pass, High Pass). Am I right?

If that's the case, the problem is that currently, in the default configuration, the Low Pass and High pass are enabled. I.e. Unless you click on the Bypass button, you won't get full range signal on output 3&4 for this configuration. Do you understand what we mean? It really points to that.

As for input signal, if you read -70dB as an input signal (VERY VERY small input signal), we have some problem of gain structure.

You should read high in the -10 to -25dB. Anything under that is just too small of the signal and it just won't register on the meters. You need to increase your source output to the miniDSP. Take some input signal, high pass or low pass it and you end up with an even smaller signal, hence the reason why it's not registering on the output meters (too low).

Solution: Go to the Crossover section and bypass the Crossover (i.e. should be flat) for all outputs. Then you will have full range signal which is what you're trying to do here.

"Simple question, but in your setup, it doesn't sound like you're using an active speaker system for a 2way system (i.e. Low Pass, High Pass). Am I right?"

Well I do have an active system. Without minidsp I am using pre-out from a receiver (Marantz SR6400) to a Rotel RB06 amplifier to a pair of fullrange speakers. With that configuration everything sounds great. Conclusion, with that set-up signal strength from pre-out connectors seems to be good enough (I have also tried on Denon AVR 2106).

"If that's the case, the problem is that currently, in the default configuration, the Low Pass and High pass are enabled. I.e. Unless you click on the Bypass button, you won't get full range signal on output 3&4 for this configuration. Do you understand what we mean? It really points to that. "

I am using the factory default settings on the device. Should'nt that be correct?

"Solution: Go to the Crossover section and bypass the Crossover (i.e. should be flat) for all outputs. Then you will have full range signal which is what you're trying to do here."

I will try that when I come home but will that be any changes since the input gain is to low?

Note, I have discussed this topic with several experienced minidsp users on Swedish forum but we haven't found any solution.

Please take the time to read this application: www.minidsp.com/applications/digital-crossovers

For some reason, I doubt that you have a DSP active system from reading your post (i.e. splitting signal @ say 1kHz) , but I may be wrong...

By default the plug-in is applying a Low Pass and High pass filter @ 1kHz. i.e. all signal above that will not go to outputs 1&2. All signal below that will not go to out 3&4.

Issue with your gain too low is a different one. Which version do you have? RevA or B? The fact that your system works fine with another piece of gear (i.e. output impedance + sensivity unknown )has little to do with this setup. You first need to know your output level of your preamp (i.e. in Vrms). possible that you have a revB, i.e. attenuating your output from your Preamp too much and therefore not showing enough signal on the meter.

DevTeam