I wonder if anyone has any suggestions about elements (not expensive) and box to build a speaker for guitar and bass amps... It wil be used for testing purposes, and i want to turn up the gain a lot for testing the amps without too much volume. My wife doesn´t like when i test things loud....
This isn't exactly the right forum, musical instruments would be more appropriate.
But I will answer you question because it is quite simple.
Get a very big resistor of 8 ohms, something that can handle as much power as the amplifier. To save money you can use a load resistor which is rated for half of the rated amplifier power but only if you play music, not continuous tones.
then you get a small speaker for monitoring, put about 80 ohms in series with it and put these in parallel with the big load resistor. You can use even more resistance and use headphones if you want. be careful selecting the values because you can damage your hearing or headphones if you get it wrong.
If you have any further questions you should ask in Musical Instruments or Amplifiers threads.
You should first search for the words: dummy load amplifier.
But I will answer you question because it is quite simple.
Get a very big resistor of 8 ohms, something that can handle as much power as the amplifier. To save money you can use a load resistor which is rated for half of the rated amplifier power but only if you play music, not continuous tones.
then you get a small speaker for monitoring, put about 80 ohms in series with it and put these in parallel with the big load resistor. You can use even more resistance and use headphones if you want. be careful selecting the values because you can damage your hearing or headphones if you get it wrong.
If you have any further questions you should ask in Musical Instruments or Amplifiers threads.
You should first search for the words: dummy load amplifier.
just add a couple of resistors to the speaker.
Add one in series with the driver to make an effective 16ohm load.
Then bypass the driver with 2r2. This reduces the load back down ~10ohms. and attenuates the speaker by ~-15dB.
The series resistor will need to very high power to dissipate the heat,
the parallel resistor can be just high power.
Adjust the values to suit the amp and the speaker impedance and the desired attenuation.
Add one in series with the driver to make an effective 16ohm load.
Then bypass the driver with 2r2. This reduces the load back down ~10ohms. and attenuates the speaker by ~-15dB.
The series resistor will need to very high power to dissipate the heat,
the parallel resistor can be just high power.
Adjust the values to suit the amp and the speaker impedance and the desired attenuation.
Perfect idea, all of it. I think i will buy effect resistors and build two four ohms stacks, mounted on heatsinks i have in the basement since a long time (didn´t wanna throw them away, now i'm lucky for that..) Then i can run it in two, four or eight ohms.. Is it ok to use "wire resistors" (i don't know what to call it.....) It shold't be a problem i think.
Something like this is what you want:
http://www.thdelectronics.com/product_page_hotplate.html
Cheers!
http://www.thdelectronics.com/product_page_hotplate.html
Cheers!
Cool!! I'll paint my construction when it's done and maybe installing a vu-meter with a lot of flashing colors ;-)
I'm stingy when i can choose between buying or build something myself.....
I'm a simple sound engineer so i don't really care what the hifi purist says, (a friend of mine is a hifi entusiast, and we always have really funny discussions)
I'm new here, but i really like this forum!!
I'm stingy when i can choose between buying or build something myself.....
I'm a simple sound engineer so i don't really care what the hifi purist says, (a friend of mine is a hifi entusiast, and we always have really funny discussions)
I'm new here, but i really like this forum!!
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