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Have you plugged the powered subwoofer into the AC mains supply?
Wolfgang Knight
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I did that. Do you see something wrong in the way I connected everything?
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If you want your sound to come out the front left and front right speakers, then I think your connections are all good. If you want the sound to come out of the subwoofer, you need to feed the signal into pin 6, and you should mix both channels together using a 1k resistor from each channel signal to pin 6.
If there's still a problem, you'll need to do some diagnosing. It's worth checking the important power supply rails first:
Check for +11.5V on pin 8 of IC100 and IC101.
Check for +11.6V and -11.8V respectively on pins 8 and 4 of IC110.
Check VERY CAREFULLY for power supply voltages on IC106 and IC107:
IC106 pin 8: +20V
IC106 pin 9: -20V
IC107 pin 8: +20V
IC107 pin 9: -20V
Don't let that probe slip, or you'll most likely do some major damage.
Listen very closely to the speakers and see if you can hear a very faint hum and/or hiss.
If there's still a problem, you'll need to do some diagnosing. It's worth checking the important power supply rails first:
Check for +11.5V on pin 8 of IC100 and IC101.
Check for +11.6V and -11.8V respectively on pins 8 and 4 of IC110.
Check VERY CAREFULLY for power supply voltages on IC106 and IC107:
IC106 pin 8: +20V
IC106 pin 9: -20V
IC107 pin 8: +20V
IC107 pin 9: -20V
Don't let that probe slip, or you'll most likely do some major damage.
Listen very closely to the speakers and see if you can hear a very faint hum and/or hiss.
Wolfgang Knight
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Thank you! I'll check the voltages tomorrow, and I'll let you know. I placed my ear on the speaker, but there's nothing, absolutely no sound at all. Thank you so much for your help!
Wolfgang Knight
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Hi KrusBlueNZ! My powered subwoofer is the SP-PWN303. The schematics is not the same, so I couldn't find the IC100 and IC101, but I was able to get the voltages for the two Audio Power Amplifiers, and I get the values specified in the datasheet. The Schematics for this powered subwoofer can be find here http://www.go-gddq.com/upload/2010-02/10021216198139.pdf in the page 62 and 63 (I should have shown you this before, that's my bad)
Maybe I need to enable the output somehow?
Thank you so much for your help, you are very kind taking the time to help me!
Maybe I need to enable the output somehow?
Thank you so much for your help, you are very kind taking the time to help me!
Wolfgang Knight
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That schematic is impossible to see in the pdf, being split in two pages. I uploaded the complete diagram here in a jpg.
http://www.nusive.com/schematic.jpg
http://www.nusive.com/schematic.jpg
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I love these sort of diagrams. You spend half an hour tracing the lines only to find you have picked up on the border and have gone round in a circle lol. Anyone else done this.
Adam
Adam
Wolfgang Knight
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Hmmm... I was measuring the voltages on the Power Amplifiers (STK413-400 and STK413-430), and I noticed that all the voltages are correct, except for negative the voltages on the PRE-VCC and BIAS pins (12 and 16, respectively) , where I'm getting a reading close to zero. Any ideas what can be failing? Thank you!
Wolfgang Knight
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In case someone tries to do this in the future: the connections discussed in the previous posts work just fine. In my particular case, a fuse resistor was blown, causing 0 volt in the BIAS pins of the amplifiers. Once that resistor was changed, everything worked perfectly. Thank you so much for all the help!
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Sorry, I must have lost track of this thread. Good work!
Wolfgang Knight
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Thank you! I am experiencing some humming noise, though. I read it can be related to the ground, but I'm not sure how to proceed. Any idea will be greatly appreciated.
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You can tell whether it's an earth loop or not by disconnecting the input connector. You can short the signal and ground connections at the signal connector as well. That should eliminate any hum. If it doesn't, it may be due to power supply ripple.
If unplugging the input connector stops the hum, then you have an earth loop or ground loop. There are various approaches to avoiding it, but none of them is ideal. Google how to eliminate a ground loop.
Some photos of your construction and overall setup could help.
If unplugging the input connector stops the hum, then you have an earth loop or ground loop. There are various approaches to avoiding it, but none of them is ideal. Google how to eliminate a ground loop.
Some photos of your construction and overall setup could help.
Wolfgang Knight
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Hi Kris! I made a rookie mistake, and forgot to plug the mesh of the audio cable to the ground loop. Now it works perfectly, no hissing sound at all. Plugged to the computer as I write this, sounding amazing. Thank you so much!!!
hey yall have an interested subject there, i have this kinda problem but i have hard time understand where yall at and how you got it donecan you please give me short cut to what you did my system is jvc th-m606 not sure if you have the exact system or what but i wanna make that 8 pin to rca to hook it up to my onkyo av receiver
thanks in advance
thanks in advance
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