Just built a Sub using 2x 4Ohm SB acoustics 8" Woofers in dual opposing, bridged config.
To cut costs I'm using an old Alpine MRP M350 Car Amp that can push 350W into 2Ohms, powered with a Meanwell 12V, 30A DC PSU.
Put it all together quickly, tested and it appeared to run perfectly. Sounded great apart from fan noise from the PSU.
Checking over I noticed that in haste I had accidentally wired the earth input from the mains (3 Pin UK with earth) into the negative input on the mean well. When I correctly wire earth to earth I get a rather loud hum from the drivers.
What is the consequence of earth into negative (I guess an unearthed and dangerous PSU). Anyone have any idea how to get rid of the hum?
Cheers
To cut costs I'm using an old Alpine MRP M350 Car Amp that can push 350W into 2Ohms, powered with a Meanwell 12V, 30A DC PSU.
Put it all together quickly, tested and it appeared to run perfectly. Sounded great apart from fan noise from the PSU.
Checking over I noticed that in haste I had accidentally wired the earth input from the mains (3 Pin UK with earth) into the negative input on the mean well. When I correctly wire earth to earth I get a rather loud hum from the drivers.
What is the consequence of earth into negative (I guess an unearthed and dangerous PSU). Anyone have any idea how to get rid of the hum?
Cheers