stellar s 300
have an audiolab m dac+ on order, here in the uk. if i connect it by xlr, is it self switching, or do i have to pull the ps unit out of the rack and manually switch it? remove the rca connections already in place from the anthem (non xlr) amp, is there a switch?
there is no switch. the s300 will play both the xlr and rca no matter what. however, please do not have both xlr and rca connected at the same time. this can cause a lot of strain on both the amp and the sources.
you need to add an external speaker selector and connect it to the front speaker connection on the receiver. set the receiver to stereo.
when you play them all together one pair may be too loud so you can connect an external speaker level volume control to the pair that are too loud. that can go in the remote location if needed. you can also get the speaker selector with volume 
controls built in.
http://www.bestbuy.com/site/speaker-accessories/speaker-selector-switches/abcat0107032.c?id=abcat0107032 no, it would not be possible without taking the headphones apart. the signal sent to the usb is digital and from the looks of it, the dac is in the headphones itself. it would be too extensive to try to get an analog connection to them because you would need to rewire it and bypass the headphone's dac. those cables will work but you don't really need them as you only have to get to where the speaker wire comes out of the wall. just cut a pair of rca cables in half. there will be a center wire that connects to the positive and the shield, that wraps around the insulated center wire, is the negative. 
the only potential problem is that you may not have enough power to drive the rears loud enough. i have a bunch of (unfortunately) amazon anker brand aaa and aa rechargeable batteries. i don’t own a charger because i’ve always just used my roommates’ chargers. my current roommate has a charger that works, because she plays instruments and needs it for things like portable amps i think? i will a… Teddy if you like those speakers you do not want them connected as previously described by you. The iMac where those speakers are coming from use a Woofer and a Tweeter amplifier. Your speaker separates the tweeter and the woofer in the plastic case. Each set of white/black cables is for the separate speaker. Connected one set of black and white to power will most certainly put an end to either one of those. If you are wanting to use the amp listed in the preceding answer, connect the two white and the two black from each speaker housing to either L or R. L- (WhiteX2) L+(BlackX2) and same for the right.


Here are the values for the amplifiers


TWEETER SPEAKER AMPLIFIER


AMP VOUT = 7.355VRMS


GAIN = -4.8(20K/17.4K)


MAX9736B APN:353S2042


POUT = 6.76 W INTO 8 OHMS @ 1% THD+N


WOOFER SPEAKER AMPLIFIER


AMP VOUT = 7.355VRMS


GAIN = -4.8(20K/17.4K)


POUT = 6.76 W INTO 8 OHMS @ 1% THD+N


RIN = 17.4 OHMS


FC = 19.5 HZ switch No, it would be forced to switch.


Source-Experience no, it won't sync as a home theater system with other speaker. the sonos surround system was design to work in the sonos ecosphere with a playbar/base, sub and 2 sonos match pairs. 
music is a different story. you can just add more speaker via the sonos connect amp or adding more sonos speakers. You can get seperate dc jacks from here

http://www.creativeit.tv/acer-laptop-dc-power-jack-repair.htm

Try not to disconnect the screen as it may never come on again, i would take to a qualified repairer. to replace the transmission vacuum modulator, you need to jack up the front passengers side of the car and support it on a jack stand. before starting, apply the park brake fully.you will need a rag, an ice cream pail and a 1/4 inch drive rachet, with universal and 12 inches of extensions and a 10 mm socket to remove the modulator hold down clamp bolt which is slightly above the modulator valve. remove the vacuum hose, remove the 10 mm bolt,catch the clamp, place drain pan(ice cream pail) under the modulator to catch tranny fluid if it drips. wiggle the old leaking unit out of the bore and remove the small diameter shaft from the old unit.insert the shaft into the new unit and carefully guide the new unit into the bore, wiggling it in all the way. grab the hold down clamp in your hand, and place it in its position to hold down the modulator, this clamp goes one way and rests on the flange of the modulator to hold it in firmly. install and tighten the bolt to approximately 15 foot pounds of torque, install the vacuum hose after blowing it out from the top, remove it from the vacuum tree by the brake booster(drivers side)and blow all the tranny fluid out, and if the hose is rubbery from being saturated in fluid, replace the top part which is about a foot long. road test the vehicle, and if you have an adjustable unit, adjust the shift points to where you would like them by turning the allen screw clockwise or counterclockwise. good luck.and don't forget to check the tranny fluid level!