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Old 12-04-2014, 05:41 PM
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Default Tell me about strapping amps.

I've never done it... but considering strapping 2 soundstream rubicon 2500's together to power 2 15's.

Is there any reason why I would want to strap them together at a 2ohm final load vs. running one for each woofer at 1ohm?

I'm assuming the current draw would be less when strapped at 2 vs. independent at 1, eh?
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Old 12-04-2014, 06:13 PM
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Originally Posted by nicyousuckk View Post
I've never done it... but considering strapping 2 soundstream rubicon 2500's together to power 2 15's.

Is there any reason why I would want to strap them together at a 2ohm final load vs. running one for each woofer at 1ohm?

I'm assuming the current draw would be less when strapped at 2 vs. independent at 1, eh?
I don't see how the draw would be less if they were strapped.
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Old 12-04-2014, 06:28 PM
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Actually running strapped isnt always more efficient. Strapping tends to create more imp rise for some reason. Example i used to run a single Crescendo bc2000d at .5ohm....clamped a solid 1900+rms and some change rising to 1.6ohm at 13v. I decided i was going to try strapping another one and strap at 2ohm (each amp seeing 1ohm) and clamped again to see the power difference thinking i was going to essentially double it....and boy was i wrong. Rising to 3.8ohm still dropping to 13v i clamped a solid 2800rms.....yep a whole 800-900watts difference. So i was actually more efficient with one amp bc i only gained tenths maybe a decibel increase on the meter.
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Old 12-04-2014, 06:46 PM
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Originally Posted by IS300IAdeathRow View Post
Actually running strapped isnt always more efficient. Strapping tends to create more imp rise for some reason. Example i used to run a single Crescendo bc2000d at .5ohm....clamped a solid 1900+rms and some change rising to 1.6ohm at 13v. I decided i was going to try strapping another one and strap at 2ohm (each amp seeing 1ohm) and clamped again to see the power difference thinking i was going to essentially double it....and boy was i wrong. Rising to 3.8ohm still dropping to 13v i clamped a solid 2800rms.....yep a whole 800-900watts difference. So i was actually more efficient with one amp bc i only gained tenths maybe a decibel increase on the meter.
Interesting.

I wonder if it has to do with the fact that each amp is only (pretend) 70% efficient on it's own, and (I assume) the multiplication of amplifiers compounds the efficiency ratings.

So say the amp is 70% efficient, but when the signal meets the second amp, you're effectively taking 70% of the first amp's 70% which then equates to 49% efficiency.

I would imagine that having two amps powering each VC independently would be like having two 70% efficient events happening simultaneously, but independently, which results in an overall efficiency of 70% vs. 49%

Drunk thinking / math. Thoughts?

EDIT: Check the math...
Your 1900 wrms amp strapped with another 1900 wrms amp created 2800 wrms.

1900 x .49 = 931.
931 + 1900 = 2831wrms which is almost exactly what you clamped.
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Last edited by nicyousuckk; 12-04-2014 at 06:52 PM.
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Old 12-04-2014, 07:05 PM
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Originally Posted by nicyousuckk View Post
Interesting.

I wonder if it has to do with the fact that each amp is only (pretend) 70% efficient on it's own, and (I assume) the multiplication of amplifiers compounds the efficiency ratings.

So say the amp is 70% efficient, but when the signal meets the second amp, you're effectively taking 70% of the first amp's 70% which then equates to 49% efficiency.

I would imagine that having two amps powering each VC independently would be like having two 70% efficient events happening simultaneously, but independently, which results in an overall efficiency of 70% vs. 49%

Drunk thinking / math. Thoughts?

EDIT: Check the math...
Your 1900 wrms amp strapped with another 1900 wrms amp created 2800 wrms.

1900 x .49 = 931.
931 + 1900 = 2831wrms which is almost exactly what you clamped.
Makes sense to me, what was even better was i sold both my bc2000's and bought my first big boy amp....saz3500v2 and that thing killed my 2-2k amps together. Much more efficient and got a solid 3600rms from one amp. Maybe something to think about down the road. But if you have the 2 amps already, its a pain but gain match them and go with it. Gain matching will be much better than strapping. One per coil like you stated in ur first post.
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Old 12-04-2014, 07:11 PM
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Originally Posted by IS300IAdeathRow View Post
Makes sense to me, what was even better was i sold both my bc2000's and bought my first big boy amp....saz3500v2 and that thing killed my 2-2k amps together. Much more efficient and got a solid 3600rms from one amp. Maybe something to think about down the road. But if you have the 2 amps already, its a pain but gain match them and go with it. Gain matching will be much better than strapping. One per coil like you stated in ur first post.
Roger that, I have bi-amped in the past with good results. Just was considering learning a new trick and doing something different. I definitely would like a big single amp like a sundown 3500 or vr4000d but the (watts/dollar) equation doesn't work out in it's favor. Although when you consider the additional money spent to bolster the electrical needed for a less electrically efficient setup, it may just be a wash.

I just want a 150 from an enclosure that's below the window line in my grand cherokee. lol
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Last edited by nicyousuckk; 12-04-2014 at 07:13 PM.
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