I'm working on an art installation where the speaker wires are made of a copper fabric material, a relatively high resistance material. I understand this is not ideal for speakers, but due to aesthetics, I'm trying to see if I can keep this same material without compromising quality/efficiency and the life span of amplifier/speaker.
This is a stereo system and audio's spatial effects are very important. Currently, the sound output is fine, it works with no issues, however, one speaker seems quieter than the other. The speaker's fabric wires are of different lengths, thus I'd like to 'balance' the resistance so both speakers have the same power distribution.
The amplifier is a typical PAM8403 stereo class D amp and its powered by 5V. The speakers are rated 3W 4Ohms.
These are the readings I get from a multimeter (amplifier to speaker connection):
- Speaker 1+ = 2 ohms
- Speaker 1- = 1.5 ohms
- Speaker 2+ = 3.9 ohms
- Speaker 2- = 4.8 ohms
And if I place the probes in between + and - near the amplifier connections:
- Speaker 1 = 6.5 ohms
- Speaker 2 = 12 ohms
The second speaker has a much longer fabric wire, thus the higher resistance. I understand PAM8403 is rated for 4ohms speakers, but would it be OK for it to drive 12ohms?
And to balance the resistance, could I add a 5W resistor in series for speaker 1? What would be best, to add 5.5 ohms on the + line for a total resistance of 12 ohms, or would I need to add resistors to + and - lines, for both speakers, so everything is balanced?
Thank you in advance.