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Set the gain of Taramps Smart 3 with Subw connected!


erne_spl

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In the eighth topic of this thread I wrote one of the methods that in my opinion were fine for adjusting the gain of this amplifier, not to mention that the operation of this was different from how I had thought it. These days I have been thinking about why both the taramps company, both barevids and bigD in their video on this amp recommended to adjust the gain of it with the subwoofer connected.
What you see here is a very simple schematic that compares a Taramps Bass 3K to a Taramps smart 3. Now if we wanted to adjust the gain of the Bass 3K, it would be enough to put a track at 40hz, without connected loads and raise the gain until we see the clip light comes on. If instead we are now going to adjust the smart 3 with the same procedure with which we have adjusted the Bass 3k, when we have finished adjusting and attacking our sub at 1 ohm, we will be constantly in current mode clip, since being an intelligent amp it goes to limit the output current so as not to burn, in simpler words since we have adjusted the gain during the adjustment phase without a subwoofer connected, during the adjustment the clipping light only came on when we touched the rail voltage, therefore at the output we would have had 78V (the amplitude of the sine wave output is directly proportional to the position of the gain), and subsequently connecting our subwoofer to 1 ohm and raising the volume, the voltage would also have increased beyond 55V (in case of 1 subwoofer ohms connected), thus causing the amplifier to intervene which would promptly limit the output current, thus creating that artificial clipping.

 

imagegainsmart3.thumb.JPG.668ecda67fa829fde8981d59703ab4dd.JPG

 

In the image the crossed sine wave is the wave necessary to obtain 3kWrms at 2ohm on the smart 3!

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On 6/7/2020 at 6:08 AM, erne_spl said:

In the eighth topic of this thread I wrote one of the methods that in my opinion were fine for adjusti..............

 

imagegainsmart3.thumb.JPG.668ecda67fa829fde8981d59703ab4dd.JPG

 

 

I still don't want to connect my brand new subs and give them full amp juice at max head unit volume .....Can I just set it at 55v with nothing connected ? I guess I can set it to whatever LOL but want to do it right. We'll see once I put it in either way gonna be fun :D

 

 

EDIT: I'm messaging with Taramps Technical Support USA (facebook) and they said to use a voltmeter if the subs aren't connected. Still trying to get more info.

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On 9/6/2020 at 15:24, Derp said:

I still don't want to connect my brand new subs and give them full amp juice at max head unit volume .....Can I just set it at 55v with nothing connected ? I guess I can set it to whatever LOL but want to do it right. We'll see once I put it in either way gonna be fun :D

 

 

EDIT: I'm messaging with Taramps Technical Support USA (facebook) and they said to use a voltmeter if the subs aren't connected. Still trying to get more info.

hahaha I can understand you either I want to connect my sub and give it the maximum rms power, but this is not necessary as theoretically now that it has been understood the operation would be enough to set the gain with a voltmeter.

 

Example: I have a 1.3ohm sub - 3000 Wrms
To calculate the maximum voltage to be given to the output we must apply a simple formula:
Volt = √ Power * Impedance (all under square root)
So in our example we just need to replace the values:
Volt = √ 3000 * 1.3 = 62.4V


So now you just need to take a tester, put it on V AC and place the gain on the amp so as to obtain with headunit at maximum (or better put the volume at 75% to avoid clipping on some) a voltage of 62.4 V.

By doing this we will have a working amplifier, but this amplifier offers us 3k from 1 to 2 ohm and setting the gain with the subwoofer connected (without voltmeters using only the clip monitor supplied) we will be able to cancel "" in a certain sense "" the impedance laughed at the subwoofer and then give it 3k really!
This is also explained here --- >> CLICK HERE

 

I'm curious to know how it ends with the support of taramps, as those contacted by email only recommend the method with connected subwoofer. If you like, update us Derp! 😃

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6 hours ago, erne_spl said:

hahaha I can understand you either I want to connect my sub and give it the maximum rms power, but this is not necessary........

 

I'm curious to know how it ends with the support of taramps, as those contacted by email only recommend the method with connected subwoofer. If you like, update us Derp! <img src=">

Yea I should be ready this weekend to hook it up. Taramps support left me on read after I asked to set to 55v for a 1 ohm load LOL  Still have to trim the bolts up and other things but plan on making the box in the next couple of days. Not too concerned about "pro" look  since it's my work car (explorer) but I couldn't do "pro"  if my life depended on it. 😆

s-l1600sdfsdf.jpg

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On 6/10/2020 at 2:31 PM, erne_spl said:

hahaha I can understand you either I want to connect my sub and give it the maximum rms power, but this is not necessary as theoretically now that it has been understood the operation would be enough to set the gain with a voltmeter.

 

Example: I have a 1.3ohm sub - 3000 Wrms
To calculate the maximum voltage to be given to the output we must apply a simple formula:
Volt = √ Power * Impedance (all under square root)
So in our example we just need to replace the values:
Volt = √ 3000 * 1.3 = 62.4V


So now you just need to take a tester, put it on V AC and place the gain on the amp so as to obtain with headunit at maximum (or better put the volume at 75% to avoid clipping on some) a voltage of 62.4 V.

By doing this we will have a working amplifier, but this amplifier offers us 3k from 1 to 2 ohm and setting the gain with the subwoofer connected (without voltmeters using only the clip monitor supplied) we will be able to cancel "" in a certain sense "" the impedance laughed at the subwoofer and then give it 3k really!
This is also explained here --- >> CLICK HERE

 

I'm curious to know how it ends with the support of taramps, as those contacted by email only recommend the method with connected subwoofer. If you like, update us Derp! <img src=">

Thanks for the info, Ive got a 3 dual 2ohm subwoofer set up configured to 1.3ohms, should I set the voltage on the amp to 62.4v? are there any videos showing how to do this on a taramp amp?

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4 hours ago, Marito said:

Thanks for the info, Ive got a 3 dual 2ohm subwoofer set up configured to 1.3ohms, should I set the voltage on the amp to 62.4v? are there any videos showing how to do this on a taramp amp?

As I wrote in past topics, just a multimeter is enough, and raise the gain with headunit to 75% to avoid distortion (unless you know that your headunit rises cleanly to the maximum, in that case put it at 100% as well ) until you get the voltage you want!

 

However I have not understood how you will connect the 3 subwoofers to get 1.3 ohm

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On 6/12/2020 at 5:31 PM, erne_spl said:

However I have not understood how you will connect the 3 subwoofers to get 1.3 ohm

Series/parallel

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Well I set the amp without the sub woofer connected to 55v. Connected subs and tried. Was loud but seemed to need more umf. So I said F it and put my test tone on, -10 db 40  Hz, cranked it to max (un-distorted) ran to the back and adjusted gain till the clipping light came on then backed  it down a bit. Needless to say it was definitely louder and didn't hurt my subs. I didn't measure the volts it was putting out while connected to the  speaker  because it was 9 PM here and didn't want the neighbors to complain but I'll measure tomorrow. The only thing I'm concerned with is the amp doesn't have much breathing room (2nd pic) but I'll play with it to see if it gets too hot, if it does then I'll have to move it....

 

EDIT: I've been  using the  amp the past  few  days and  it is  freaking great. I've never  had speakers above 1.5k rms until  this system and the amp is pushing  them very, very well. Greatly pleased with the amp. Gets warm, but nothing to cry about and it absolutely  rips.

 

IMG_9291.jpg

amp clearance.jpg

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