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Review and Measurements of New JDS Labs Atom Headphone Amp

solderdude

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If I plan to use the Atom as a "power amp", with the volume being driven by an upstream source, how high should I turn the volume on the Atom?

To the max?
to 'power' what exactly ?
small 4 or 8 Ohm speakers ?
 

solderdude

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Then I would suggest to set the volume of the Atom so that at max volume on the upstream side it the Atom plays as loud as you want the headphones to go. That could be max. volume or lower. That way you get optimal volume control range with the Atom.
 

ripvw

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Then I would suggest to set the volume of the Atom so that at max volume on the upstream side it the Atom plays as loud as you want the headphones to go. That could be max. volume or lower. That way you get optimal volume control range with the Atom.
This is exactly what I am doing with my D50S and Atom. The Atom volume pot is not as accurate at lower volume settings and the feel of the pot is less than wonderful - but given the price acceptable. I leave the volume pot on the Atom at 1 o'clock and change the volume from the D50S up and down from -35db to 0db. This gives me sufficient range to accommodate all my sources and allows for precise remote volume setting with mute function. This capability along with the removal of the ESS IMD hump (likely inaudible to me) is the reason I replaced my Khadas Tone Board with the D50S.

if only the pair had balanced XLR connections...
 
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daftcombo

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Then I would suggest to set the volume of the Atom so that at max volume on the upstream side it the Atom plays as loud as you want the headphones to go. That could be max. volume or lower. That way you get optimal volume control range with the Atom.
It's a good idea BUT on the Atom, the volume knob is also the power on knob. Meaning that at 0 (7 o'clock) the unit is off.
So unless someone wants to adjust the volume knob to a definite position any time (1 o'clock for instance), another idea would be to have it at 1 o'clock (so always on) on a power bar with an on/off switch which would power the whole system.
 
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Just got my Topping D30 and use it along with my Atom. Perfectly happy so far. Quick question though. Shall I use gain or not? With gain, it is already loud at 11 o'clock whereas without gain I can crank it up to 2 o'clock before it becomes uncomfortable. Headphones are DT 770 pro 250 Ohm.
 

JohnYang1997

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Just got my Topping D30 and use it along with my Atom. Perfectly happy so far. Quick question though. Shall I use gain or not? With gain, it is already loud at 11 o'clock whereas without gain I can crank it up to 2 o'clock before it becomes uncomfortable. Headphones are DT 770 pro 250 Ohm.
Unless you are not getting enough loudness with low gain volume max, you use low gain.
 
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