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General Car Audio
No Output from Helix DSP Amplifier
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<blockquote data-quote="sageRJ" data-source="post: 8757458" data-attributes="member: 683344"><p>I officially feel dumb and truthfully, am getting frustrated for the first time. I see why some of you do this for a living now. I was using a DD-1 to determine the HUs max volume at different sources; Bluetooth, Radio, AUX, CarPlay. At first it would not give a reading but eventually realized I needed to get up to at least 30/40 on the Pioneer DMH-WT8600NEX before the DD-1 would detect the signal. I'm not sure if this is normal or not.</p><p></p><p>Then I moved onto the Helix M Four DSP. Since my HU puts out 4V to the preouts, I set the DSP Input Gain at 5V to insure no input clipping before the ADC. The DD-1 was giving no reading at the speaker outputs. I started up the DSP PC-Tool software and performed an Input Signal Analyzer (ISA.) Nothing. After slamming my head against the wall for a while thinking about it, I thought back to the Input Gain setting done in the software. To get the 5-20V choices you must change the Input Selection to "High Level." (see attached photo DCM SM) I changed the selection back to "RCA" and 4V, which is the highest choice within RCA. Boom. The ISA is now seeing a full range signal on all four input channels (Front L/R, Subwoofer L/R.) Move back to the speaker outputs on the DSP and still nothing detected by the DD-1. Try playing some music and still no sound.</p><p></p><p>I don't believe it's the speaker outputs specifically. I have a set of RCAs coming from the M4 DSP line output to the Helix M One mono amplifier. I disconnected the RCAs from the M1 and went directly into the DD-1. It doesn't detect a signal there either. So the M4 DSP doesn't seem to be outputting from anywhere.</p><p></p><p>I've read the manual multiple times but still, I must be forgetting something. Any suggestions to try would be much appreciated.</p></blockquote><p></p>
[QUOTE="sageRJ, post: 8757458, member: 683344"] I officially feel dumb and truthfully, am getting frustrated for the first time. I see why some of you do this for a living now. I was using a DD-1 to determine the HUs max volume at different sources; Bluetooth, Radio, AUX, CarPlay. At first it would not give a reading but eventually realized I needed to get up to at least 30/40 on the Pioneer DMH-WT8600NEX before the DD-1 would detect the signal. I'm not sure if this is normal or not. Then I moved onto the Helix M Four DSP. Since my HU puts out 4V to the preouts, I set the DSP Input Gain at 5V to insure no input clipping before the ADC. The DD-1 was giving no reading at the speaker outputs. I started up the DSP PC-Tool software and performed an Input Signal Analyzer (ISA.) Nothing. After slamming my head against the wall for a while thinking about it, I thought back to the Input Gain setting done in the software. To get the 5-20V choices you must change the Input Selection to "High Level." (see attached photo DCM SM) I changed the selection back to "RCA" and 4V, which is the highest choice within RCA. Boom. The ISA is now seeing a full range signal on all four input channels (Front L/R, Subwoofer L/R.) Move back to the speaker outputs on the DSP and still nothing detected by the DD-1. Try playing some music and still no sound. I don't believe it's the speaker outputs specifically. I have a set of RCAs coming from the M4 DSP line output to the Helix M One mono amplifier. I disconnected the RCAs from the M1 and went directly into the DD-1. It doesn't detect a signal there either. So the M4 DSP doesn't seem to be outputting from anywhere. I've read the manual multiple times but still, I must be forgetting something. Any suggestions to try would be much appreciated. [/QUOTE]
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