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Help with amp gain/wattage setting

 
  #1  
Old 11-02-2016, 03:38 AM
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Default Help with amp gain/wattage setting

Setup is an arc xdi 600.4 BRIDGED. RMS is 300 (bridged) per channel
Speakers are Hertz Millie MLK 165.3 300watt MAX/150watt continuous @4ohm
If my calculations are correct that equals a line out voltage (tested with DMM using a 1k test tone) of 34.64 thus giving me the 300 watt output bridged, per channel/speaker. There's only one gain adjuster for this amp in bridged mode.

Here's what I'm needing, I need to dial the amp gain back to get an output of approx. 200 watts to the speakers. I'm informed that this would be the highest I would want to run the wattage to these speakers.

How do I get it set to 200 watts??
I'm assuming that if a take the 34.64 and divide by 3 (since its based off of 300watts and I'm wanting 200watts , 11.55 is equal to 100watt per the above calculation method 3x11.55=34.64)
Is it safe to say that if I DMM it to 23.1 then that should be 200watts output, correct?

Any help or insight would be appreciated.
 

Last edited by tesnevo; 11-02-2016 at 03:41 AM.
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Old 11-02-2016, 03:47 AM
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Originally Posted by tesnevo View Post
Setup is an arc xdi 600.4 BRIDGED. RMS is 300 (bridged) per channel
Speakers are Hertz Millie MLK 165.3 300watt MAX/150watt continuous @4ohm
If my calculations are correct that equals a line out voltage (tested with DMM using a 1k test tone) of 34.64 thus giving me the 300 watt output bridged, per channel/speaker. There's only one gain adjuster for this amp in bridged mode.

Here's what I'm needing, I need to dial the amp gain back to get an output of approx. 200 watts to the speakers. I'm informed that this would be the highest I would want to run the wattage to these speakers.

How do I get it set to 200 watts??
I'm assuming that if a take the 34.64 and divide by 3 (since its based off of 300watts and I'm wanting 200watts , 11.55 is equal to 100watt per the above calculation method 3x11.55=34.64)
Is it safe to say that if I DMM it to 23.1 then that should be 200watts output, correct?

Any help or insight would be appreciated.
28.3 vac
 
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Old 11-02-2016, 06:17 AM
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There is a free app in the apple App Store called "Ohms Law" and is as simple as it gets.

28.28

200 to 220 is probably the edge of the sandbox with those speaks but they will start to distort fast so keep a good ear on them. If ur gonna run that high u might consider running the HPF up just a tad. Really just depends if u want loud or warm or a combo of the two.

T
 

Last edited by Tailwind; 11-02-2016 at 06:23 AM.
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Old 11-02-2016, 09:12 AM
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I've actually got the amp crossover at 100, you think it should be higher? I'm installing a Audio control dq-61 so I can dial in the sound. I'm tired of not being able to adjust the sound!
 
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Old 11-02-2016, 12:23 PM
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Originally Posted by tesnevo
I've actually got the amp crossover at 100, you think it should be higher? I'm installing a Audio control dq-61 so I can dial in the sound. I'm tired of not being able to adjust the sound!
Ur crossing the MLK at 100?

No, I don't think higher than about 85 to 90. 80 if ur looking for less loud and more warm.

Every amp is gonna be a bit different but my experience was that the MLK cried uncle and started to show earlier signs of bass distortion than I expected in the low 80s.

If u like loud as hell, I would assume 100+ would scream!!!!

90 with the Hertz tweet crossover at 0 was where I found the sweet spot for my set up and ears.

T
 

Last edited by Tailwind; 11-02-2016 at 12:31 PM.
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Old 11-02-2016, 03:53 PM
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Ok I will adjust as suggested.
Not saying I am BUT if I did change the arc amp out for something else, any suggestion on an amp for these MLK's??
 
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Old 11-02-2016, 04:20 PM
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I dig the Fosgate TM400x2
 
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Old 11-02-2016, 04:45 PM
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Being the 1st one here with those I went all over the board. My advantage was having a xover in my head unit so I could cut more slope and know exact freq cutoff as well as the ability to eq them. At 70hz 18db 250 watts all day long distortion free. Without that advantage 200 per side like I stated. Running that amp bridged you do only have 1 gain. Using the amps xover just bring it down till it distorts a tad then bring it back up.
 
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Old 11-02-2016, 05:19 PM
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Originally Posted by slyedog View Post
Being the 1st one here with those I went all over the board. My advantage was having a xover in my head unit so I could cut more slope and know exact freq cutoff as well as the ability to eq them. At 70hz 18db 250 watts all day long distortion free. Without that advantage 200 per side like I stated. Running that amp bridged you do only have 1 gain. Using the amps xover just bring it down till it distorts a tad then bring it back up.
Got it, thanks again.
I'm actually installing this in place of the BTLL's.
http://www.audiocontrol.com/car-audi...upgrade/dq-61/

With the 6channel line out converter and eq I'm able to dial this in better.
I hate not having any type of eq for this system.
 
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Old 11-02-2016, 05:39 PM
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Originally Posted by Bunker View Post
I dig the Fosgate TM400x2
The fosgate TM400X2ad amp?
 

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