Line level subwoofer out voltage?

thefish · 2nd February 2007, 04:21 PM

What is a normal voltage to expect on a line level subwoofer output? I was just plugging in a cheap computer sub to my receiver to test it and nothing but silence. I checked the subwoofer output of my receiver with my trusty 300mhz Tektronics O-Scope and it is telling me only 70mv peak to peak... this seems very low to me I would have expected in the 1-5V range. The frequencies comming out look good but the voltage is really low.

thefish · 3rd February 2007, 03:22 PM

Ok well I took maters into my own hands and made a little opp amp circuit (gain = 14) to boost the signal high enough that the amp in my subwoofer picks it up and now everything seems fine... well its not perfect since there is a lot of noise in the circuit due to the fact that it is on a bread board and I had no shielded cable to make an RCA so I just used speaker wire... but since its just driving low signals on a sub it seems to be ok.

thefish · 3rd February 2007, 07:29 PM

Schematic

2nd February 2007, 04:21 PM	#1
thefish diyAudio Member Join Date: Oct 2006	Line level subwoofer out voltage? What is a normal voltage to expect on a line level subwoofer output? I was just plugging in a cheap computer sub to my receiver to test it and nothing but silence. I checked the subwoofer output of my receiver with my trusty 300mhz Tektronics O-Scope and it is telling me only 70mv peak to peak... this seems very low to me I would have expected in the 1-5V range. The frequencies comming out look good but the voltage is really low.

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3rd February 2007, 03:22 PM	#2
thefish diyAudio Member Join Date: Oct 2006	Ok well I took maters into my own hands and made a little opp amp circuit (gain = 14) to boost the signal high enough that the amp in my subwoofer picks it up and now everything seems fine... well its not perfect since there is a lot of noise in the circuit due to the fact that it is on a bread board and I had no shielded cable to make an RCA so I just used speaker wire... but since its just driving low signals on a sub it seems to be ok.