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Lightspeed attenuator lithium battery pack

I'm going to pick up a lightspeed attenuator but am not certain which 12vdc lithium battery packs on e-bay have 2.5 mm, center positive, plugs. They aren't listed anywhere and I can't figure out how to contact the sellers to ask them. Can you guys help me with this? I'd like to keep it as inexpensive as possible ($20?) and I do want battery vs. wal wart.

Also, what do you think is going to be the best 3 foot rca's under $50? I am thinking signal cable analogue 2's because they have a low capacitance and are $50 a pair. What do you guys think?

Thanks!
128x128b_limo
photonman
96 posts
 
how many hours of listening do you end up getting with the 3800mah battery?

do you notice difference in sound?
clio09
3,345 posts
 
Probably varies but at least a week. I have tried both battery and linear power supply and while I will acknowledge there is a difference it is quite small and I really cannot say with certainty what that difference is.
jult52
155 posts
 
Clio - I had the LSA hooked up to a linear power supply and could detect no difference between that and an SMPS wall wart. I am a big believer in linear ps but my conclusion in this instance was the Lighhtspeed's design left it insensitive to power supply quality.
dgarretson
2,592 posts
 
There is debate on the LSA DIY forum regarding the significance of clean power into LDR devices. I use LDRs in a custom volume control in an AtmaSphere MP-1 preamp. If you can solder and perform basic kit assembly, for about $100 including transformer the Twisted Pear's Placid HD current-shunt regulator is a good choice. Each LDR needs under 10ma, which is adjustable as described in the regulator kit instructions.

BTW, whether used in a passive or active preamp, LDRs sound great relative to a stepped attenuator.
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