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Old 01-02-2009, 10:21 AM   #1
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I have a 120V tuner/amp that is used with a iphone to play music in my coach both when on shore power and on coach batteries. When on batteries, it is plugged in to a dedicated 500W inverter. When on shore power, the sound is perfect but when the inverter is used, there is significant, annoying static. The static is present with the engine on or off. I just installed a Progressive 9145 converter but I changed the audio system at the same time so I don't know if it is contributing to the problem.

I got to believe there are inverters out there that won't introduce static into my audio system but how do I find one? Does anyone know what specifications and/or features make for a static free inverter? What about quality brands? Would some kind of filter help?

Thanks in advance to any rving geeks or audiophiles out there who reply.
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Old 01-02-2009, 10:21 AM   #2
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I have a 120V tuner/amp that is used with a iphone to play music in my coach both when on shore power and on coach batteries. When on batteries, it is plugged in to a dedicated 500W inverter. When on shore power, the sound is perfect but when the inverter is used, there is significant, annoying static. The static is present with the engine on or off. I just installed a Progressive 9145 converter but I changed the audio system at the same time so I don't know if it is contributing to the problem.

I got to believe there are inverters out there that won't introduce static into my audio system but how do I find one? Does anyone know what specifications and/or features make for a static free inverter? What about quality brands? Would some kind of filter help?

Thanks in advance to any rving geeks or audiophiles out there who reply.
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Old 01-02-2009, 10:32 AM   #3
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I suspect that you have a modified-sinewave inverter, which produces an AC voltage waveform that is almost, but not quite, entirely UNlike a sine wave.

If you don't have one, I recommend that you replace your inverter with a true-sinewave inverter.

A couple of examples: Xantrex 400W inverter More power, keptin!
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Old 01-02-2009, 06:52 PM   #4
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You got the right answer above. You can't filter a modified sine wave inverter output. It's really pulsating DC
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Old 01-02-2009, 08:30 PM   #5
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Thanks Mahlon and Onaquest. The 400W Xantrex seems like just what I need, but the price!

I'll be taking my tunes with a dash of static while I save some coin.

Thanks again
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Old 01-03-2009, 04:09 AM   #6
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">The 400W Xantrex seems like just what I need, but the price! </div></BLOCKQUOTE>

That's why there are so many modified sine wave inverters available.
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Old 01-04-2009, 05:53 AM   #7
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by jupoa:
The 400W Xantrex seems like just what I need, but the price! </div></BLOCKQUOTE>
I feel your pain. All of what was said above is true, but not all modified-sinewave inverters are created equal. Some of them have waveform filters. I've been happy (so far) with my Dimensions 12/300 modified-sinewave inverter, unfortunately I have no idea where I'd send you to buy one.
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Old 01-08-2009, 05:19 PM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Mahlon:
not all modified-sinewave inverters are created equal. Some of them have waveform filters. </div></BLOCKQUOTE>

Not true. Some have a wave form with more steps than others, but there is no way to filter the output of a MSW inverter.
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