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November 29, 2022, 01:26:22 AM

Author Topic: New amp and volume control  (Read 150 times)

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Offline Mulburg

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New amp and volume control
« on: November 24, 2022, 09:40:04 AM »
I went from a fairly low 8 watt ACA to a moderately powered 25 watt aleph j diy amp. The volume on the moreplay now jumps up quickly from low to a little too high for low level listening. And to get the balance more even, you have to go up a little higher.

The sound quality is still great, no other issues at all. Is this something that can be mitigated?

Offline Paul Birkeland

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Re: New amp and volume control
« Reply #1 on: November 24, 2022, 10:01:49 AM »
Why not use the balance control to get the channel balance more even?

You've gone up in amplifier gain (power is completely independent from gain).  You can attenuate the inputs of your amplifier if things are too sensitive, or you could get similar results by padding down the pot a little bit.  The Moreplay has extremely low gain for a preamp, so I would tend to suggest getting some Harrison Labs attenuators and just plugging those into your amp.

(You could also get less sensitive speakers)
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Mucker

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Re: New amp and volume control
« Reply #2 on: November 24, 2022, 10:51:19 AM »
What kind of sources do you run into your Moreplay?

Offline Mulburg

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Re: New amp and volume control
« Reply #3 on: November 24, 2022, 03:19:30 PM »
iPhone and or ipad.

Offline Mucker

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Re: New amp and volume control
« Reply #4 on: November 24, 2022, 05:49:30 PM »
Ah. Unfortunately I'm unfamiliar with Apple gear.

Usually all of my digital source gear is routed to a DAC with a digital volume control. I typically turn the volume of the Moreplay up and turn the DAC volume down.

Have you tried reducing the volume coming out of the iDevices and turning up the Moreplay volume?

Offline btol

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Re: New amp and volume control
« Reply #5 on: November 25, 2022, 06:45:07 PM »
You can attenuate the inputs of your amplifier if things are too sensitive, or you could get similar results by padding down the pot a little bit.

How do I go about padding the pot? I plan to start my build this week and will also be using an Aleph J with the Moreplay. I have 99 dB sensitive speakers and would love to have as much usable range on the volume pot as possible.

Offline Paul Birkeland

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Re: New amp and volume control
« Reply #6 on: November 26, 2022, 04:40:51 AM »
See item #3 and the picture on the first post here:
https://forum.bottlehead.com/index.php?topic=4295.0

You'll want to use 7.5K and 3.3K for the resistor values.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline btol

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Re: New amp and volume control
« Reply #7 on: November 26, 2022, 09:39:04 AM »
See item #3 and the picture on the first post here:
https://forum.bottlehead.com/index.php?topic=4295.0

You'll want to use 7.5K and 3.3K for the resistor values.

Thank you! I will take a look.