04:57 <DocScrutinizer05> arossdotme: I'd use a class-D amp for that, and such amp should be pretty much voltage tolerant on power supply per definitionem. I don't think those 15V are to be taken serious when using a class-D

04:57 <DocScrutinizer05> 16

04:59 <DocScrutinizer05> also a LiIon battery has 4.2V pretty much only during charging. As soon as you draw some jiuce from it, it drops to 4.1 and 4.05 pretty quickly

05:01 <DocScrutinizer05> but honestly, what the heck?? 500Watts?

05:02 <DocScrutinizer05> that's plain madness for battery powered. Simply because you can't move the speaker for that even with a sack cart

11:32 <arossdotme> DocScrutinizer05, it is a class d amp. i was looking at using car amps but they have this bloody 16v limit :(

11:32 <arossdotme> a alpine one :)

11:33 <arossdotme> arr i never measured a liion for when in use V drop. inserting

11:34 <arossdotme> heh yea 500w is my limit cus the battery size just gets massive and run time not so much

11:34 <arossdotme> its for a alpine subwoofer

11:34 <arossdotme> *car

11:36 <arossdotme> been looking at irs2092 amps and i think ive found one that can use the 45v +/-DC as that is the max output of the only dc to +/- duel dc boost converter (happens to be also designed for audio amps) that i can find

11:40 <arossdotme> this is the one, looks like it is/has mono/bridge output? https://www.aliexpress.com/item/DIY-HIFI-Amplifier-V1-0-IRAUD350-700W-4ohm-Mono-Audio-Power-Amplifier-board-Class-D-AMP/32698223625.html?ws_ab_test=searchweb0_0,searchweb201602_1_10056_10065_10068_10055_10054_112_10069_10059_110_111_10073_10017_10071_109_10070_108_10060_10061_10052_10062_10053_10050_10051,searchweb201603_6&btsid=342b64d0-44a8-487c-842b-5d68cd23c950

11:41 <arossdotme> manufacture page https://www.yuan-jing.com/irs2092-class-d-mono-amplifier-board-350w-350w?search=irs2092

11:44 <arossdotme> heh inserting=interesting

11:59 <arossdotme> boost: https://www.aliexpress.com/item/500W-single-DC-DC12V-positive-and-negative-double-DC-45V-boost-power-supply-board-adjustable-pressure/32712054819.html?ws_ab_test=searchweb0_0,searchweb201602_1,searchweb201603_6&btsid=28a4982a-0533-4316-bdcc-23c25189fae1

12:00 <arossdotme> so with that irs amp board, i am also trying to work out if the ac is rectified, if so then i can power it from +/-DC directly

13:43 <arossdotme> then again those amp boards dont look too good: http://www.diyaudio.com/forums/class-d/284655-iraud200-short-story.html

16:22 <arossdotme> looks like the ac is rectified, looks like those large rectangular things are rectifiers

16:22 <arossdotme> arrrgh idk what to do

16:23 <arossdotme> theres this very nice board http://www.audiophonics.fr/en/amplifier-boards/irs2092-stereo-class-d-amplifier-2x-200w-4-ohms-p-7128.html

16:23 <arossdotme> with prober doc

16:23 <arossdotme> but the car amp which looks like it is as good, 2rd hand is £40

16:24 <arossdotme> but the 16v max limit where with the board i get to chose a pwr supply that works for me

16:25 <arossdotme> my lion batt is around 300WH so maybe instead of trying to have something that works with the batts i have i should buy the car amp and get a lifepo4 batt using the £60 i saved :)

16:26 <arossdotme> that is to say get a batt with 500WH min :)

18:17 <arossdotme> know of any lifepo4 distributors in the uk or Europe?