I got some cheap-o plate power amps from Aliexpress. They are getting mounted in some old Bose Acoustimass sub modules in order to "convert" these bass modules into active units.
Yeah, I know these are not true "subwoofers", etc.. But for my application, they are all I need.
I am interfacing these plate amplifiers to my Bose S1 Pro speakers - which have balances (TRS) outputs. In order to reduce noise, I wanted to KEEP the balanced connection all the way to the sub's, sooooo...
I built 2 small "balanced-to-unbalanced" circuits (thanks to ESP Sound) using the NE5532 op-amps.
As you all know, these op-amps prefer +/- 15vdc.
Here is the catch... the plate amps DO HAVE a split-power supply already there - as the built-in crossover already uses NE5532 op-amps. But I noticed, when measuring the actual voltage (out of curiosity) that the actual voltage is +12.5vdc and -15.2vdc.
The two voltages are not perfectly equal.
Would this affect performance any? If so, what might I need to look out for?
Obviously, this works since.. the factory op-amps on the crossover are already dealing with this.
But just curious?
Yeah, I know these are not true "subwoofers", etc.. But for my application, they are all I need.
I am interfacing these plate amplifiers to my Bose S1 Pro speakers - which have balances (TRS) outputs. In order to reduce noise, I wanted to KEEP the balanced connection all the way to the sub's, sooooo...
I built 2 small "balanced-to-unbalanced" circuits (thanks to ESP Sound) using the NE5532 op-amps.
As you all know, these op-amps prefer +/- 15vdc.
Here is the catch... the plate amps DO HAVE a split-power supply already there - as the built-in crossover already uses NE5532 op-amps. But I noticed, when measuring the actual voltage (out of curiosity) that the actual voltage is +12.5vdc and -15.2vdc.
The two voltages are not perfectly equal.
Would this affect performance any? If so, what might I need to look out for?
Obviously, this works since.. the factory op-amps on the crossover are already dealing with this.
But just curious?