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In Reply to: RE: How will efficient speakers/amp on batteries compare? posted by ggking7 on March 17, 2012 at 15:39:09
Batteries can deliver tons of current - short a 12 volt battery with a large wire sometime if you question it !!
Amps run on batteries run dead quiet . Blackest background ever and amply dynamic
They still seems to lack something compared to well designed power supply.
Placing a good quality cap across the batteries to lower impedance seems to help
Simon
Follow Ups:
"They still seems to lack something compared to well designed power supply"Correct, you got it right. NO battery supplies for me !! SLM and saturntube (above) said it best by far !!
Jeff Medwin
Edits: 03/20/12
Car batteries are actually 13.8 volts when fully charged, but that can be up to 16 when over charged. Assuming a low of 12v, depending on amplifier design, and load impedance, you can pull quite a few peak watts from them without any ripple. After all they do start cars, don't they.
I don't get where ripples in batteries would come from, unless there is a momentary voltage sag under load, but I doubt that horn speakers would ever make that happen in a sane home volume level. I find that my speakers draw less that 0.02 watts most of the time, as measured on the woofer section (forget about measuring the mid and tweet horns). Even 20 db peaks only draw 2 watts, which for 6 ohms, is only about 3.5 volts of peak swing for less than 0.6 amps of peak current for a few milliseconds, usually about 1/2 a volt or less for most reasonably loud music.
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If they can "deliver tons of current" then a cap would not lower impedance since it has to have extremely low impedance to deliver those tons. However, batteries do not produce pure DC. There is a noise element which may be reduced with a cap or other filtering.
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Batteries can supply a lot of low frequency current; however, their impedance goes up at higher frequencies. The higher high frequency impedance is why the capacitor across them helps.
Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.. . .Oh!. . .Remember: Modifying things voids their warranty.
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I can't find any data to support what you said. Do you have any links?
How much does the impedance go up from 20 to 20K?
Thanks
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Or you can just use batteries on the woofer amp.
and have a discontinuity of sound, if biamping a GOOD speaker, the amps MUST be exactly the same. A good system will use one amp, with the same time constant through it, and play it all !!! Look up a Serious Stereo 2A3 amp, as a start and a finish in amps.
Jeff Medwiin
I have to disagree, Jeff. I have bi-amped bunches of systems, and most of the time the amps are different. They all sound great. Of course, if you do have matching amps, so much the better. I do have to say though, I have never heard a SET amp with decent bass. Low bass is not a strong point of a SET design (the 'Single Ended with Slam' by Bruce Rozenblit may do it). I much prefer a decent SS amp up to about 300-500 Hz, and then go to tubes there in a bi-amped system.
"I much prefer a decent SS amp up to about 300-500 Hz, and then go to tubes there in a bi-amped system."
Hornloco
I had tubes. Prefer modern SS...........no transformers, bias, etc. to deal with, which is what you pay for. Love the even harmonics of tubes, but it's just a pleasant distortion.
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