You should be fine without it. Relay probably draws more amps than the 3 amp remote turn ons.

 

This is the perfect answer… I would only add a relay if I wanted to power other accessory’s in the system, for example I run all the 12v chargers from the output of my main turn on relay so everything is on if tuning for example…

 

3 new amps plus existing one(s)? Idk what the limit is on the DSP remote out but you might want to review that carefully. If you draw more current that it’s capable then that remote output will permanently fail.

 

Total is 4 amps. One Zapco 650.6(will upgrade soon), three Mosconi 2/10. How can I find out the limit on the DSP remote? Thank you,

 

I interpreted 3 total but maybe I misinterpreted? 3 total will be fine.

 

4 total.

 

My Helix Mini turns on 7 amps with no problem.

 

 

this is a good point. You could measure your remote current draw of all your amps to see if you are below the threshold.

 

And the right way

 

If you want to use a relay here is what I used for my minidsp

Digikey Link

 

Depends on the DSP. Helix has like 500mA capacity which is a lot. Mosconi DSP on has 100mA. Amp draw is different for every Amp but is usually 50-75mA based on my research. Relay must have a diode to prevent voltage spike on power off.

 

Thank you. All Helix DSP have 500mA? My friend got the old Helix .2, where can I find those capacity?

 

My M4DSP turns on 3 other amps with no issues. You should be good.

 

With 500mA, I wouldn't worry about a relay. With a Mosconi and it's 100mA I would unless I was only running 1 amp. Just thought I would take a look at another popular DSP, the MiniDSP C-DSP 8 x 12 and its only 100mV also.

 

Thank you, Sir.

 

Got it done yesterday with 4 amps and running without relay with no problem. Thank you everyone.

 

That 3.5A is the current draw for the amplifier simply being turned on. That is not being pulled from the remote wire of the DSP. I don't see remote current draw in the specs you listed, but guestimating it's probably less than 100mA. The 500mA remote line of the DSP can probably handle the 4 amps, but if it were me, I personally would go ahead and do a relay. In addition, I would also stick a 500mA fuse on the remote out of the DSP. The fuse is cheap protection.

 

Thank you, sir. Drawing below is about right? Will be using 14 gauge for REM wire. please feel free to add any suggestions.
I was thinking about this busbar, anything better than this one?
https://www.amazon.com/Pair-Terminal-Distribution-BUSBARS-Terminals/dp/B07C4W7YKG/ref=sr_1_6?crid=3DBOF2ENNJ9BP&keywords=bus+bar+terminal+block+12v&qid=1670602484&sprefix=bus+bar,aps,134&sr=8-6

 

Relay will go after the DSP. DSP REM Out 》Fuse》Relay 》 Amps

 

Thank you. So will be something like picture below.

 

Yes.

 

Thank you, sir.

 

Hi Bob,

Is this the right way how to wire DIODE Relay.

86 Ground
85 REM from DSP ( will be a 500 mA fuse in between REM and 85)
30 +12V constant (secondary battery) not sure if I need a fuse for this wire also
87 Amplifiers REM

This is the Diode relay https://www.amazon.com/gp/product/B07ZDJZCKW/ref=sw_img_1?smid=A5UR51Z4IJK5J&psc=1

 

Hi Bob,

Is this the right way how to wire DIODE Relay.

86 Ground
85 REM from DSP ( will be a 500 mA fuse in between REM and 85)
30 +12V constant (secondary battery) not sure if I need a fuse for this wire also
87 Amplifiers REM

This is the Diode relay Amazon.com: GEBE 993081 Mini Relay 5 Terminal SPDT 12V 40/30A with Diode - Made in Germany : Industrial & Scientific

Believe me you don't need relay...
Diode relay's terminal 86 should be positive...

 

That's a 5 pin, it may work but I don't know. Here is 4 pin and Mark @ CAF has a pretty good video on how to do it. He talks about relays around the 4 min mark.

Hella Normally Open Relay with Diode - 4 Pin, 12V DC 40Amp

Hella Normally Open Relay with Diode - 4 Pin, 12V DC

www.ozautoelectrics.com

 

Thank you, sir.

 

2:19 is correct way. 5:50 is wrong, probably they missed it. Flyback diode cathode is always on positive...

 

Thank you, sir.

 

By watched this YouTube again and again, still don't know how can I measure how much my REM amps drawn just like he did on this one?

I was thinking positive probe connect to REM from HU and negative probe connect to REM on the amp. Not sure if this the right way. Please advise.

 

By watched this YouTube again and again, still don't know how can I measure how much my REM amps drawn just like he did on this one?

I was thinking positive probe connect to REM from HU and negative probe connect to REM on the amp. Not sure if this the right way. Please advise.

Depends on your DMM (model/make?) but yes, you hook it up by using the DMM as the actual wire and then set the range appropriately. Most Digital Ammeters only measure up to about 5A maximum.

 

He is measuring it with DMM which has ability to measure amperage; this usually requires replugging the leads to dedicated ports for measuring amperage. Measurement should be done with all power to amps connected with common ground and leads of DMM connected in series as you described altought polarity doesn't matter.

REM IN is most common NPN transistor to Mosfet cascade supplied between positive and ground of an amplifier while REM IN is just voltage trigger for gate(control terminal of transistor) of cascade. Simply said; in reality trigger current could be so small that is under the scale of DMM.
This is why multiconnection of REM IN is prefered over the relay.
I didn't want to go in deep of transistors but hope it helped...

 

But the DSP only has 500mA available for REM connection. Does the Brax have 3amp? The right relay can spike only at 150mA, many will do more hence the need for a diode.