how do they do it?

[toolfan89 10+ year member]

what do shops and places like best buy and cc use to power all their amps and recievers?

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[JimJ 5,000+ posts]

Large linear or switching 12VDC power supplies.

Astron and other places make them, but once you get over 20A or so of current they start getting expensive, fast.

 

[toolfan89 10+ year member]

cool

 

[toolfan89 10+ year member]

http://cgi.ebay.com/ebaymotors/40-Amp-Elixir-Power-Converter-Charger-DM-4000-New_W0QQcmdZViewItemQQcategoryZ50070QQihZ006QQitemZ160101845919QQrdZ1QQsspagenameZWDVW

something like this?

 

[JimJ 5,000+ posts]

Something like that, yeah.