Headroom

With a this listening postion like this you hear brick wall echo. Hilarious!

Started a tread about SPDIF USB US2 battery powered and it was deleted after several post without notice and killed. Censorhip here in this forum? Asked the Silver back top guy, but I am hanging in the trees... No answer yet

Keep the +- wires as short as possible, 8 inch is much to long...

http://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery Need a BMS for charging and monitoring There is no free lunch.

Batteries seem like a PITA. Oh my good. I am so wrong here ... Was not tho whole tread, stepping up the in soundquality? My Hifiguru has a Mantra: Less electronic parts in component and improved independent powersupply (aka DC) is o lot betta than more tronics and (ac) less independent powersupp. YUP! KISS Rule: Get rid of Preamps plug direct to Poweramp, less tronics more Music! Lead batteris suffer much erlier, discarched deeper than 30%. 80% LIFEPO is a another universe. Simply not alow the Voltage to drop below 2.7v/cell...

Sound depends on the capacity of the batteries size deeper internal impedance = more control, less influence the wires and the connectors, LiFePO A123 are best and safest. LION is not as good has some protection circiuts wich gives a higher internal impedance. The secret of good sound with LiFePO4 is give easy and fast a big amount of current ( many amps) alkaline can not so. The AC powerlines are full of dirt, in the night when everybody is asleep sound is better. And always listen yourself (even if some Bypass caps give a better sound) :-)

Just switched form AC/DC to the bare LION thing! ups fantastic and dirt cheap... http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170535518546

LIFEPO is a good idea, I did not know that Bypassing with caps will hurt.I am a looking right now to change it in my system too. Golden Rule single cells: If you break this rule, you are pulling the pin on the grenade. Absolutely NEVER Exceed 4.3v/cell, never Discharge below 2.7v/cell, never puncture the cells = NEVER discharge the pack beyond 80% of its capacity 20% remaining. If you do not keep at least 20% capacity in the pack, the cells will have a VERY short life! LIFEPO have 1.5 factor in Ah compared to lead. Facts: 350$ AGM Lead Batterie 12V 260 Ah = 2,8 mOhms LIFEPO4 A123 3.2 V 20 Ah ?$ Prismatic = 1.2m Ohms but you need 3 in serial for 9 Volt. Northstar NSB 100 FT 12 V 100Ah 380 $ = 2.5 mOhms ZEOL 5.6m Ohms

this is mine… http://www.wernergraf.ch/www.wernergraf.ch/index.html Regulation is not needed the internal stages catches up. Plastic (static electr.) is not good for audio signals, even metal ( or AC lines) close to wires with Audiosignal is not recomended. A battery is never linear, impedance changes with the Voltage. The chemistry changing the condition. Full loaded and below 1/2 down sound is not good. Good Caps helps... Serge likes huge 250 Ah for feeding. I have 56 Ah for my CD player with Rubicon and Leclanche Paper in Oil and ome woodlense. The 50$ IRiver Optical Out CD Soundsytem (see pdf above) is still a bit greyer and muddier than Computer Audio. Here some infos "Caps" in Powersupplys, they act like a "buffer" and brings the influence of Chemistry voltage over a wide frequency down. http://www.seattlerobotics.org/encoder/jun97/basics.html

Plastic has static electricity and more small caps is better than 1 or 2 big ones. This Ideas coming from Serge Schmidlin http://www.audio-consulting.ch/?Philosophy http://www.audio-consulting.ch/images/file/html/sixmoons/1.html http://refaudiomods.blogspot.com/2010/01/world-class-parts-from-audiocom.html http://www.referenceaudiomods.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=RAM&Product_Code=ACT_1F_WIRE

Dont use the bare LIPO. Put several 470uF/16V Rubicon black Gate Low ESR in parallel. Recomended 20 Pieces or more 470uF/16V and cut of the plastic housing from the caps.

http://www.powerstream.com/PST-MP3500.htm Hello I have only negativ concerns about this overpriced product. Rip Off. I had 3 oft them used for Audio recordings in the field often it switches off because loose contact. The plug has internal wires broken after a while. Here in Switzerland its 35 $ and it has a Voltage Converter (buzzing) No On Off Switch everytime you have to dial in for the Voltage.