JL MHX280/4 sensitivity gain settings
Ultimate HDF Member
Joined: Mar 2015
Posts: 6,446
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From: TEXAS
Originally Posted by Bertk
Thanks for the heads up T.
Apparently the thermal overload protection didn't kick in.
Apparently the thermal overload protection didn't kick in.
T.
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-FW
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Tourer
Joined: Jul 2007
Posts: 369
Likes: 139
From: Minnesota
Well, I readjusted the amp gain/sensitivity with the bike running, the was very little difference than when it wasn't running and plugged into the battery tender.
What I did find unusual, is the that I used 2 different test tones, both 1 Khz 0db.
This one:
https://www.mtx.com/testtones
And this one:
https://www.stevemeadedesigns.com/board/topic/96978-test-tones-and-tuning-tutorial-all-new-links-again/
I set the voltage to 24 using the first time, when I used the second tone it measured 1.5 ish volts higher.
Anyway, I went with the 1st one at 24 volts...
Time to put it all back together.
What I did find unusual, is the that I used 2 different test tones, both 1 Khz 0db.
This one:
https://www.mtx.com/testtones
And this one:
https://www.stevemeadedesigns.com/board/topic/96978-test-tones-and-tuning-tutorial-all-new-links-again/
I set the voltage to 24 using the first time, when I used the second tone it measured 1.5 ish volts higher.
Anyway, I went with the 1st one at 24 volts...
Time to put it all back together.
Ultimate HDF Member
Joined: Mar 2008
Posts: 5,788
Likes: 203
From: SW Florida
Well, I readjusted the amp gain/sensitivity with the bike running, the was very little difference than when it wasn't running and plugged into the battery tender.
What I did find unusual, is the that I used 2 different test tones, both 1 Khz 0db.
This one: https://www.mtx.com/testtones
And this one: https://www.stevemeadedesigns.com/bo...w-links-again/
I set the voltage to 24 using the first time, when I used the second tone it measured 1.5 ish volts higher.
Anyway, I went with the 1st one at 24 volts...
Time to put it all back together.
What I did find unusual, is the that I used 2 different test tones, both 1 Khz 0db.
This one: https://www.mtx.com/testtones
And this one: https://www.stevemeadedesigns.com/bo...w-links-again/
I set the voltage to 24 using the first time, when I used the second tone it measured 1.5 ish volts higher.
Anyway, I went with the 1st one at 24 volts...
Time to put it all back together.
The first one being 102.1 and the second 102.8
Choosing the lesser of the two is a safe move. This reinforces what several folks here have been saying that when done setting the target VAC, readjust the Gaines by ear for best sound and to confirm the signal is distortion free. A DMM is not a distortion detector.
Last edited by Bertk; Mar 11, 2017 at 08:16 PM.
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Tourer
Joined: Jul 2007
Posts: 369
Likes: 139
From: Minnesota
Looking at each test tone in MP3Gain they both have a different volume level.
The first one being 102.1 and the second 102.8
Choosing the lesser of the two is a safe move. This reinforces what several folks here have been saying that when done setting the target VAC, readjust the Gaines by ear for best sound and to confirm the signal is distortion free. A DMM is not a distortion detector.
The first one being 102.1 and the second 102.8
Choosing the lesser of the two is a safe move. This reinforces what several folks here have been saying that when done setting the target VAC, readjust the Gaines by ear for best sound and to confirm the signal is distortion free. A DMM is not a distortion detector.
It sounds good, even at max volume...
Ultimate HDF Member
Joined: Mar 2008
Posts: 5,788
Likes: 203
From: SW Florida
Below is a screen shot of the two test tones in question.
Normally MP3Gain is used to automatically adjusts mp3s so that they all have the same volume. This reduces the need to keep adjusting the volume via the hand controls.
When you set the gains on the amp what was the volume set to on the HU?
Using the Boom HU it should have been 15. And once the gains are set, 15 should be your max volume.
Thread Starter
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Tourer
Joined: Jul 2007
Posts: 369
Likes: 139
From: Minnesota
You can see the volume in a application called MP3Gain.
Below is a screen shot of the two test tones in question.
Normally MP3Gain is used to automatically adjusts mp3s so that they all have the same volume. This reduces the need to keep adjusting the volume via the hand controls.
When you set the gains on the amp what was the volume set to on the HU?
Using the Boom HU it should have been 15. And once the gains are set, 15 should be your max volume.
Below is a screen shot of the two test tones in question.
Normally MP3Gain is used to automatically adjusts mp3s so that they all have the same volume. This reduces the need to keep adjusting the volume via the hand controls.
When you set the gains on the amp what was the volume set to on the HU?
Using the Boom HU it should have been 15. And once the gains are set, 15 should be your max volume.
There were three more to go, not sure if that was 15 without counting.
If you adjust at 15 and never go higher, why not adjust at full volume, then you couldn't ever go higher.
I never knew you could adjust the levels on MP3 themselves!
Seasoned HDF Member
Joined: Jan 2013
Posts: 10,637
Likes: 1,246
From: Lake, Ms
Originally Posted by hypecat
Bert,
There were three more to go, not sure if that was 15 without counting.
If you adjust at 15 and never go higher, why not adjust at full volume, then you couldn't ever go higher.
I never knew you could adjust the levels on MP3 themselves!
There were three more to go, not sure if that was 15 without counting.
If you adjust at 15 and never go higher, why not adjust at full volume, then you couldn't ever go higher.
I never knew you could adjust the levels on MP3 themselves!
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Tourer
Joined: Jul 2007
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From: Minnesota
Mine is a 4.3
Seasoned HDF Member
Joined: Jan 2013
Posts: 10,637
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From: Lake, Ms
Most all of the testing has been done with the 6.5 HU but I would think the 4.3 would be the same. The audio portion between the two HU's are the same. The only difference is the added capabilities of the 6.5.