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Issue setting gains with DMM?
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<blockquote data-quote="Sguirrelfeather" data-source="post: 8476126" data-attributes="member: 668995"><p>I don't think I can have a signature yet (newb), so here's my setup:</p><p></p><p>2004 Ford Excursion</p><p></p><p>JVC KW-R910BT head unit</p><p></p><p>JBL GTO-5ez amp running 1 sub and front/rear door speakers</p><p></p><p>500W to sub @2 Ohm, 75W to speakers (RMS)</p><p></p><p>JBL GTO-3ez amp running another sub and the rear passenger speakers</p><p></p><p>500W to sub @2 Ohm, 75W to speakers (RMS)</p><p></p><p>2 x 10" JBL GTO1014D subs in sealed enclosure (1 box, 2 separate compartments) between front seats</p><p></p><p>350W RMS subs...I knew they were below my amp's rating, but i got a deal so why not. lol</p><p></p><p>6 x JBL GTO 509C component speakers - 5 1/4 mid, 3/4 tweet using included x-overs</p><p></p><p>75W RMS</p><p></p><p>So, my issue/question.... When I first put this in, I tried doing the setting gains by ear thing. That was a no-go because I have some hearing loss due to an explosion, so I decided to try to the included setup CD that came with the amps. Sounded great, never heard any clipping or distortion (except for a couple songs I learned do NOT need to be played loud or else it will eat the sub surrounds), etc. Well, after lurking in here for a couple months, I decided I would give using a DMM a try when setting my gains.</p><p></p><p>I used the 50Hz and 1kHz tones from Realm of Excursion which are supposed to be 0dB tones. Did everything the tutorials said....disconnected positive leads, made sure amp gain is on low (which I needed to set it to med because it was just about maxxed at the minimum gain setting), etc etc. I did the calculation for proper voltage to check for, double checked, set it, made sure both subs were as close as possible to matching, mids/highs set to match, and so on. Turned off, hooked speakers back up, turned on.....and got a huge disappointment. Honestly, the stock system was louder. Yes, the new equipment sounds infinitely better, but I could easily talk over it.</p><p></p><p>I decided to check the voltage while a really "heavy" song played at the max volume. On the subs it maxxed around 14V when the ridiculous amount of bass hit. Though at that volume, it was more like smooth jazz bass. lol I then used the setup CD and set it back the way it was before. I checked voltages on that same song and it was about perfect...at the volume I am comfortable playing that song at without fear of destroying things, it would peak, momentarily of course, at ~32V, just above the 31.62 I set the sine wave to.</p><p></p><p>For the record, I played the song from my phone using bluetooth, the test tone was played through my phone, and the song was downloaded off Google Play Music, so it wasn't a low quality/low volume copy. Any ideas? Did I do something wrong? Should I have used a different test tone?</p></blockquote><p></p>
[QUOTE="Sguirrelfeather, post: 8476126, member: 668995"] I don't think I can have a signature yet (newb), so here's my setup: 2004 Ford Excursion JVC KW-R910BT head unit JBL GTO-5ez amp running 1 sub and front/rear door speakers 500W to sub @2 Ohm, 75W to speakers (RMS) JBL GTO-3ez amp running another sub and the rear passenger speakers 500W to sub @2 Ohm, 75W to speakers (RMS) 2 x 10" JBL GTO1014D subs in sealed enclosure (1 box, 2 separate compartments) between front seats 350W RMS subs...I knew they were below my amp's rating, but i got a deal so why not. lol 6 x JBL GTO 509C component speakers - 5 1/4 mid, 3/4 tweet using included x-overs 75W RMS So, my issue/question.... When I first put this in, I tried doing the setting gains by ear thing. That was a no-go because I have some hearing loss due to an explosion, so I decided to try to the included setup CD that came with the amps. Sounded great, never heard any clipping or distortion (except for a couple songs I learned do NOT need to be played loud or else it will eat the sub surrounds), etc. Well, after lurking in here for a couple months, I decided I would give using a DMM a try when setting my gains. I used the 50Hz and 1kHz tones from Realm of Excursion which are supposed to be 0dB tones. Did everything the tutorials said....disconnected positive leads, made sure amp gain is on low (which I needed to set it to med because it was just about maxxed at the minimum gain setting), etc etc. I did the calculation for proper voltage to check for, double checked, set it, made sure both subs were as close as possible to matching, mids/highs set to match, and so on. Turned off, hooked speakers back up, turned on.....and got a huge disappointment. Honestly, the stock system was louder. Yes, the new equipment sounds infinitely better, but I could easily talk over it. I decided to check the voltage while a really "heavy" song played at the max volume. On the subs it maxxed around 14V when the ridiculous amount of bass hit. Though at that volume, it was more like smooth jazz bass. lol I then used the setup CD and set it back the way it was before. I checked voltages on that same song and it was about perfect...at the volume I am comfortable playing that song at without fear of destroying things, it would peak, momentarily of course, at ~32V, just above the 31.62 I set the sine wave to. For the record, I played the song from my phone using bluetooth, the test tone was played through my phone, and the song was downloaded off Google Play Music, so it wasn't a low quality/low volume copy. Any ideas? Did I do something wrong? Should I have used a different test tone? [/QUOTE]
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