Troubleshooting DMM not reading voltage

[sjv13 10+ year member]

@mylows10; @LBC; @dunerider650;

Alright guys, I tried it again with the subsonic filter set to 5hz (lowest), LPF set to 400 (highest), bass boost at 0, and gain was at exactly half. I tightened down the DMM's leads into the speaker wire outputs. The head unit was at 50/62, loudness off, no EQ settings, etc. The bass knob was all the way up. I played a 0dB 50hz 192kbps (only bitrate available) sine wave from realmofexcursion.com that I downloaded to my iPhone. I set the DMM to AC volts. Reading = ~ 00.21 volts. What am I doing wrong here!?

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[LBC]

[quote name='sjv13']@mylows10; @LBC; @dunerider650;

Alright guys, I tried it again with the subsonic filter set to 5hz (lowest), LPF set to 400 (highest), bass boost at 0, and gain was at exactly half. I tightened down the DMM's leads into the speaker wire outputs. The head unit was at 50/62, loudness off, no EQ settings, etc. The bass knob was all the way up. I played a 0dB 50hz 192kbps (only bitrate available) sine wave from realmofexcursion.com that I downloaded to my iPhone. I set the DMM to AC volts. Reading = ~ 00.21 volts. What am I doing wrong here!?

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Use a cd. Download the SMD DD-1 disc and use track 1. 40hz at 0db. Burn it and use that. your iphone has to be the problem. It has a volume and gain of it's own.

 

[mylows10 5,000+ posts]

watch this

 

[sjv13 10+ year member]

Use a cd. Download the SMD DD-1 disc and use track 1. 40hz at 0db. Burn it and use that. your iphone has to be the problem. It has a volume and gain of it's own.

My head unit doesnt have a CD player. And I'm using the USB cable with the iPhone, not the 3.5mm jack, so I thought it wouldnt matter?

 

[mylows10 5,000+ posts]

it still does

 

[LBC]

My head unit doesnt have a CD player. And I'm using the USB cable with the iPhone, not the 3.5mm jack, so I thought it wouldnt matter?

Unfortunately it does.

 

[sjv13 10+ year member]

it still does

So I guess I really have no way to set my gain to the sure max safe level then...

 

[mylows10 5,000+ posts]

usually half is really close,but yea ,unless you can get a really good download and put it on a flash drive

 

[sjv13 10+ year member]

usually half is really close,but yea ,unless you can get a really good download and put it on a flash drive

I put that realmofexcursion.com file on a flash drive and tried it again. All the same settings as before. Read: ~ 00.29 volts

 

[mylows10 5,000+ posts]

did you look at the video i sent you .it says a flat response all around loudness off unplug all rca's and use a 60 hrtz test one not 50

 

[sjv13 10+ year member]

did you look at the video i sent you .it says a flat response all around loudness off unplug all rca's and use a 60 hrtz test one not 50

yeah, I watched it. I unplugged the 4 channel's rcas (left the mono's in though of course). Loudness was off. All EQ settings were flat. No bass enhancements. I'll try it with a 60hz tone, but I didnt think that part mattered.

 

[mylows10 5,000+ posts]

let me know what you get

 

[sjv13 10+ year member]

let me know what you get

Ok, so I found a different website. I downloaded a 705kbps 60hz sine wave in .wav format. I tried it and I am still getting the same results as before.

 

[mylows10 5,000+ posts]

hmm kind of wondering if something going on with the amp now

 

[sjv13 10+ year member]

hmm kind of wondering if something going on with the amp now

When it's hooked up normally the sub plays the music perfectly fine, so I dont see how it could be an amp related problem.