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What is the ideal position for the gain knob on the back of my power amp for my speaker? Which I run a parasound a31 and a pair of rf7iii and the rc64iii for my center.

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8 hours ago, JoeJoeThe3rd said:

What is the ideal position for the gain knob on the back of my power amp for my speaker? Which I run a parasound a31 and a pair of rf7iii and the rc64iii for my center.

From my understanding, amp gain controls are used to better match the output voltage of your preamp.  Determine the preamps output voltage and adjust the amps gain accordingly.

 

From the Parasound A31 Manual

 

When to Set the Gain Control Knobs Above or Below Normal You can increase loudness by turning the Gain control knobs clockwise if your system will not play loud enough with the Gain control knobs set at Normal. This could be the case if your A 31 is driven from the pre-out jacks of an AV receiver (as opposed to an AV processor). We recommend advancing the gain as little as possible past Normal. As you increase gain settings you increase the chance of hearing a “hiss” sound from your speakers. You also run the risk of damaging your speakers (not to mention your hearing) if the volume level is too high. The primary reason to reduce the gain below Normal would be if your speakers’ efficiency is extremely high and your listening position is close to your speakers. Reducing the gain would reduce audible “hiss” from your speakers. Don’t worry about setting the A 31 Gain control to exactly the same levels for all channels because you can always balance the channel volume using the speaker level calibration in your home theater AV receiver or AV processor’s setup menu. Note: We recommend re-calibrating your AV receiver or processor’s speaker levels after adjusting the A 31 gain controls.

 

Bill

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10 hours ago, willland said:

From my understanding, amp gain controls are used to better match the output voltage of your preamp.  Determine the preamps output voltage and adjust the amps gain accordingly.

 

From the Parasound A31 Manual

 

When to Set the Gain Control Knobs Above or Below Normal You can increase loudness by turning the Gain control knobs clockwise if your system will not play loud enough with the Gain control knobs set at Normal. This could be the case if your A 31 is driven from the pre-out jacks of an AV receiver (as opposed to an AV processor). We recommend advancing the gain as little as possible past Normal. As you increase gain settings you increase the chance of hearing a “hiss” sound from your speakers. You also run the risk of damaging your speakers (not to mention your hearing) if the volume level is too high. The primary reason to reduce the gain below Normal would be if your speakers’ efficiency is extremely high and your listening position is close to your speakers. Reducing the gain would reduce audible “hiss” from your speakers. Don’t worry about setting the A 31 Gain control to exactly the same levels for all channels because you can always balance the channel volume using the speaker level calibration in your home theater AV receiver or AV processor’s setup menu. Note: We recommend re-calibrating your AV receiver or processor’s speaker levels after adjusting the A 31 gain controls.

 

Bill

Yeah read the manual but that doesn’t say what it is which had to do with voltage between the two. I wonder what the optimal position for the gain with my rf7iii and rc64iii and anthem mrx720.

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2 hours ago, JoeJoeThe3rd said:

Yeah read the manual but that doesn’t say what it is which had to do with voltage between the two. I wonder what the optimal position for the gain with my rf7iii and rc64iii and anthem mrx720.

Trial and error.  You may have to experiment a bit.

 

Bill

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are you trying to solve a particular issue?

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I had some Parasound amps with my 4 La Scalas.  I had to turn down the input gain to the amps so I could run my pre/pro at higher gain and control hiss.  That is the only purpose for the input gain on the power amp.  There is NO ideal position.  There is no point in looking for one.  Any of the possible settings that allows the preamp and amp to reach the loudness you desire, is a good setting. 

 

You will never be able to tolerate the full power of that amp driving RF-7s. 

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Anthem MRX720

 

Specifications

PREAMPLIFIER
Maximum Output (<0.1% THD) 4.2 Vrms

 

 

Parasound A31

 

Input sensitivity:

1 V for 28.28 V(THX Reference)

 

As mentioned, you will have to set it to your liking.

 

Bill

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