Which aiwa sounds nicest ?
mraiwa1000 - 2012-05-21 07:52
950 on 9-volts sound the best
Then if you add more batteries like the 660 on 12-volts and more amplifier power
then it Now is the better choice
600 Takes 8 batteries and is wimpier than the 660 = Equals best choice
770 takes 9 batteries for 13.5 volts
880 takes 9 batteries for 13.5 volts plus 2 aa's for the digital part.
926 takes 8 batteries .... and is th smallest and therefore the least bass
990 takes 8 batteries aaahh dont really know cause the one I have is a parts box an dont work but would still chose the 950 then the 660 then - just not really interested in the rest of these except to fix em an sell them and or also Go forward from here to a different brand other than aiwa...
Which aiwa sounds nicest 600 660 770 880 926 950 990 IMG_2401
m90sold 600 660 770 880 926 950 990
got mixed up...
http://i53.tinypic.com/2q3oytv.jpg
Which aiwa sounds nicest 600 660 770 880 926 950 990 IMG_2402
600 660 770 880 926 950 990
I think the one below the 926 is the one f the best!
Anyhow, how much is that one?
traveler - 2013-01-24 19:17
It's true that the Aiwa 950/955 are top doggies in the 9v boombox arena. I've already discussed this in the other forum so don't want to type it all up again. But the short basic reason is that these two models uses 4-amps in bridged configuration. Normal amps can not produce more voltage at the output than what it takes in. That's why voltge is so important as the voltage out is limited by the voltage in. But when amps are bridged, the paired amps are capable of outputting twice the voltage or 4 times the power of the same amps in a SE configuration. In other words, it may be working with 9-volts but is performing as if the voltage is much higher. There is no true ground in this setup and the ground is known as "floating" ground. Won't get into the technical details of why this is, but anyone desiring to know more about bridged amps and it's benefits can google it if they wish.
Wish you would ( type it all up again - or copy it over to here ) 
Would like to Know more about Boombox's that use Amplifier's with Floating grounds and why they were chosen to be used in boombox's
What is the best amplifier used in a Boombox, Floating Ground or is there another Design that works better & in which brand is it utilized the most ?
retro - 2013-01-24 20:45
Don't hold your breath too long, I'd Google it if I were you. 
traveler - 2013-01-24 21:04
Don't hold your breath too long, I'd Google it if I were you.
yes, though I would like to hear from a 
Master technician ( Stormin Normin ) Concerning boombox's,
that are Battery operated - How or what
is the best design of amplifier to Best wring the most out of "D" cells as a power source.
Giving the Most Music power for the Longest duration - On One Set of Batteries!
Emanating from a Battery operated boombox 6 D cells or larger 
superduper - 2013-01-25 03:17
Not sure I understand your question(s). Bridged amplifier (BTL) designs are common, especially when as it applies to battery powered devices. The JVC M70 and M90 both utilize bridged amp designs. The Pioneer SK-900 and Conion C100 both designed their sets with bridged amps (Hitachi HA-1392 chips) although in the case of the C-100, they implemented this arrangement in quite an unconventional manner which no other manufacturer I've seen used. I only say this because most manufacturer of consumer products generally follow the guidelines published and recommended by the amp chip manufacturers. Although Hitachi never recommended a bridged configuration with their HA-1392 chips, the way Pioneer did it is pretty normal with regards to bridging amps. Conion did it by retaining the output capacitors (the same capacitors recommended by Hitachi BUT for SE designs). In general, bridging amps eliminates those large output capacitors which makes me wonder whether the Conion engineers knew what they were doing, or at the minimum, I wonder what they were thinking.... But I digress.
If you are noticing that the examples above also happen to be top doggy type boxes, then you observe correctly. This design is more costly to manufacture so obviously, it would be reserved for their upper tier products as opposed to the more common SE (single ended) amp designs. I started to type in a technical description of the differences between SE and BTL but deleted it. It's not worth all the time and effort to do so. AS I said before and as Retro said, lots of information is published and you just need to google it. In any event, the best way to wring the most power from battery powered audio devices is with BTL amps. The lower the available voltage, the more important it would be to use a BTL amp arrangement.
As for efficiency, use them modestly and most boomboxes last a very long time on a single set of batteries. I don't think anybody here can give you a rank list of how long each boombox will last in comparison to others.