Things for sale and power amp thoughts

So one of the recent advances in power amplifiers is switching power supplies. I find this interesting because most switching power supplies will ‘eat’ DC just as happily as AC.

The question is, will modern amps run directly off my car’s traction pack without the need for inverters? This could substantially increase the amount of power output I could achive if I were using my car for (hypothetically) power during a party.

Right now I’m limited to about 3kW continuous by the limitations of the DC/DC converter. If I could run amps directly off the traction pack, the only theoretical limit becomes the energy stored in the traction pack – 10kW is only doable for 2 hours, for example.

On the other hand, a PA stack rated 10kW is seldom _drawing_ 10kW – because the only time the transistors are actually conducting massively is during the heavy bass notes or kick drum beats.

It might be possible to do 8 hours of audio at 10kW, given the power consumption ratio

10kW would seem to me to be about the target output for a outdoor show.

(And I’m 1500W closer to it today thanks to the wonders of E-bay)

Let’s see.

Output capacity online:

1400W in the subs
3300W in the mains (with new additions)

Total: 4700W. Halfway there. 😉

I need to find a party that needs sound, to test out my latest additions.

In other news, I’m trying to get rid of a motorcycle. Anyone in Seattle want a motorcycle that doesn’t run? $100, you pick it up or use my shop facilities to clean carbs and change battery after which you could probably drive it home. Full disclosure: needs carbs cleaned, new battery, new left shock, new front tire, new right mirror. 750CC, twin, with shop manual and clear title. 10k miles.

Also, anyone need a folding e-bike? Again, doesn’t run (on batteries.. you can pedal it and it’s got a 3-speed transmission) – it could almost certainly be repaired since it’s only obvious problem is the motor mount is bent but it might need other things too. This one is free to the first person to come pick it up.

Also, is anyone interested in buying a gas board scooter? $600/obo, ran good the last time it was started (6 months ago), heavily modded with custom deck, exhuast resonator, extra big air intakes. I’ve never driven it so I can’t say how it performs.. it was collatoral on a loan that was never repayed. If there is any potential interest I can get model number, pictures, things like that.

Anyone want a rolling 19″ rack? This is the old-skool SKB rack that held 12U on the bottom and a 18U mixer (would fit the Alesis studio 32, several other 16-channel mixers). This is the style with two big wheels on the back and two casters, good for going up and down stairs and other offroad activities. I still have all the body plates for it. $35.

Or, how about a Digitech Vocalist MIDI Vocoder? This I’ll probably e-bay off unless someone is interested – I’ve done many good and creative things with this beastie, but I upgraded to a TC Helicon for lead pitch correction and whatnot, and it does so much more. $100

Any takers for a Midiman USB/serial to 8X midi adapter? Drivers for every OS you could name. $100, cosmetically perfect, electrically perfect, I replaced with a MTP AV because I needed better clock control

How about a roland SC-880 sound module? Great drums, great strings, $200

Last but not least, is anyone interested in some monitor speakers.. electrovoice ported 10″ with high-compression horn tweeters – one of them has minorly damaged high frequency driver (no longer performs as well as the other one). $50 (this is a kickass price, for this you can well afford to replace the blown driver from MCM electronics and still be way cheaper than the $200 these would cost you new). Program capacity: 100W RMS – and they aren’t kidding. 😉 [Hence the damaged driver – I hooked ’em up to a 900W RMS amp, then someone cranked up the keyboards and damaged]I’ll even through in some 1/4″ speaker cables to get ’em hooked up to your amps.

S. [who is trying to get some of this CRAP OUT OF MY BASEMENT! ARGHHHH!!]

3 Responses to “Things for sale and power amp thoughts”

  1. sati Says:

    Is this your version of a yard sale?

  2. brassratgirl Says:

    Post this shiznit on craig’s list:

    the best place for finding people, rides and stuff. It’s an internet phenomenon!

    could probably find a roommate that way too.


  3. Hayden Bennett Says:

    our power amplifiers are just homebrew stuffs but they are great sounding stuffs.*,

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