Hi, one of my customers who rents out equipment for events and carnivals asked me to make a passive dummy load so the can test amplifiers under full power without causing noise problems to other nearby businesses.
He wants 8 ohm and 4 ohm loads, originally he asked for 8 ohm 500w resistors, and I said we could use two resistors in parallel for 4 ohm 1000W
Then I found these cheap power resistors on Alibaba. It says they are 'Braking' resistors, but they seem to be suitably rated for my purpose
https://www.alibaba.com/product-deta...147691533.html
I figured with 8 of these (costs only 33 euros in total) connected in various series/parallel combinations he could have 2x 8R 2000W, 2 x 4R 1000W or 1x 4R 4000W load
He also wants to know if he can have a lower powered monitor speaker attached so he can hear the sound quality, but at a less than deafening volume, when load testing Amps.
See the attached dickyCAD image.
Q1. Can I use these resistors for Audio load testing? If yes, Maybe I should place cooling fan(s) near the resistors or bolt them to a large piece of metal?
Q2. How best to implement the Monitor speaker? Can it be done like shown in my diagram?
Rich
He wants 8 ohm and 4 ohm loads, originally he asked for 8 ohm 500w resistors, and I said we could use two resistors in parallel for 4 ohm 1000W
Then I found these cheap power resistors on Alibaba. It says they are 'Braking' resistors, but they seem to be suitably rated for my purpose
https://www.alibaba.com/product-deta...147691533.html
I figured with 8 of these (costs only 33 euros in total) connected in various series/parallel combinations he could have 2x 8R 2000W, 2 x 4R 1000W or 1x 4R 4000W load
He also wants to know if he can have a lower powered monitor speaker attached so he can hear the sound quality, but at a less than deafening volume, when load testing Amps.
See the attached dickyCAD image.
Q1. Can I use these resistors for Audio load testing? If yes, Maybe I should place cooling fan(s) near the resistors or bolt them to a large piece of metal?
Q2. How best to implement the Monitor speaker? Can it be done like shown in my diagram?
Rich
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