Chain three 140s

[darrenelding]

Hi,

Does anyone know if it is possible to chain three Expert Pro 140s together to drive a three way speaker in an active setup? I have been running two 140s in an active setup for a couple of years but a change in speakers means that I now need a third amp. It seems to me that the lack of an Aes input on the 140 means I cannot chain more than two. Anyone have any thoughts?

[daniel.avasilichioaei]

You can't do this using Devialet configurator normally. But, you can do it in at least two ways:
- You make the configuration for 3 Expert Pro 210 units, then manually modify the configuration files.
- You make 3 configurations for two Expert Pro 140 units and use only the 3 files from the master units in the amplifiers. The first master must have the digital input that you are using active, and the other two only the RCA digital input. Between the units you must use RCA digital cables (2 pieces).

[audio_engr]

- You make 3 configurations for two Expert Pro 140 units and use only the 3 files from the master units in the amplifiers. The first master must have the digital input that you are using active, and the other two only the RCA digital input. Between the units you must use RCA digital cables (2 pieces).

I'd use this method. Thank you Daniel for helping me in the past to get the breakthro' from Devialet's Configurator's bug using your method for my Dual mono 440-Pro.

[darrenelding]

Thanks for the reply Daniel. It's good to know it is possible despite Devialet support telling me it wasn't. I'm not sure I fully understand the method though and want to make sure I know exactly what I'm doing before buying an additional 140.

I'm understand I can configure 3 amps for the 3 speaker drives, bass, mid and treble. Let's say I setup the master amp as bass and the first slave as mid and and connect them via RCA digital cable. This is basically the setup I have now. I can use the configuration to setup the 2nd slave as treble. But from there I'm confused. Do I configure the 2nd slave to connect directly to the master or to the 1st slave? Could you please provide more of an idiots guide?

Many thanks

Darren

[daniel.avasilichioaei]

Thanks for the reply Daniel. It's good to know it is possible despite Devialet support telling me it wasn't. I'm not sure I fully understand the method though and want to make sure I know exactly what I'm doing before buying an additional 140.

I'm understand I can configure 3 amps for the 3 speaker drives, bass, mid and treble. Let's say I setup the master amp as bass and the first slave as mid and and connect them via RCA digital cable. This is basically the setup I have now. I can use the configuration to setup the 2nd slave as treble. But from there I'm confused. Do I configure the 2nd slave to connect directly to the master or to the 1st slave? Could you please provide more of an idiots guide?

Many thanks

Darren

Follow this thread, starting from this post. You will find additional clarifications.
https://devialetchat.com/Thread-Stereone...#pid106360

[darrenelding]

I have finally got my hands on a 3rd 140 Pro amp and am trying the setup you suggested.  I have the 1st Master (Treble) connected to the 2nd Master (Mid) connected to the 3rd Master (Bass).  This is how they are connected: 
Amp 1 Digital 1 --> Amp 2 Digital 2 
Amp 2 Digital 1 --> Amp 3 Digital 2

The connection between Amp 1 and Amp 2 is working ok, but Amp 3 is not picking up any input into Digital 2 (it displays as orange on the display).

Do you have any idea what I have wrong.  Is it something to do with the Chainir settings perhaps?

[daniel.avasilichioaei]

I have finally got my hands on a 3rd 140 Pro amp and am trying the setup you suggested.  I have the 1st Master (Treble) connected to the 2nd Master (Mid) connected to the 3rd Master (Bass).  This is how they are connected: 
Amp 1 Digital 1 --> Amp 2 Digital 2 
Amp 2 Digital 1 --> Amp 3 Digital 2

The connection between Amp 1 and Amp 2 is working ok, but Amp 3 is not picking up any input into Digital 2 (it displays as orange on the display).

Do you have any idea what I have wrong.  Is it something to do with the Chainir settings perhaps?

The configurations on Amp 2 and 3 should be identical, except for the filters.
Just for debugging, you can temporarily try these three tests:

• Put the same configuration file on Amp 3 that you use on Amp 2 and see if it works. This checks that the cables are connected correctly.
  
• Swap the SD card between Amp 2 and Amp 3. This checks the configuration file used on Amp 3.
  
• Put Amp 3 in place of Amp 2 with the SD card from Amp 2. This checks that Amp 3 is not malfunctioning.
  

You can do these tests without having the speakers plugged in. If you leave them plugged in, then make sure to use a very low volume.

[darrenelding]

Thanks so much for the help once again!  I have now got it working by cabling from Amp 1 to 3 then to 2, keeping the sim cards as they were.  Not sure how this changed anything as the configs of 2 & 3 should be the same.  However, I have now found a new slight issue in that as I am using one remote to control all three amps simultaneously, they seem to fall out of sync with each other.  Most of the time changing the volume with the remote changes all 3 amps but sometimes one amp has a slight delayed response.  Once the volumes are out of sync there is no way of aligning them again other than to turn them all off and on again.  Is this an issue you've encountered?

[daniel.avasilichioaei]

Once the volumes are out of sync there is no way of aligning them again other than to turn them all off and on again.  Is this an issue you've encountered?

Yes, I've encountered it from time to time. If I remember correctly, it happened especially when turning on the amplifiers, if I didn't wait long enough for them all to turn on.
To synchronize them, it is not necessary to turn off the amplifiers. It is enough to turn the volume to minimum and that will synchronize them.