Southern Engineering strikes again
Cruiser
Joined: Nov 2017
Posts: 207
Likes: 11
From: Alabama
ssmorga my head unit is the stock HK with preamps installed by Iron Cross Audio. It puts out a little lower voltage on the low level outputs than most aftermarket head units do, so I suspect that is the difference. If I remember correctly with a 1Khz test tone I can turn the head unit up to one notch from wide open before I get clipping. Some head units will go wide open with no clipping. The 2/3 volume recommendation is really not applicable if you can test properly. It is just a setting some folks use if they do not have access to an oscilloscope. I had a similar discussion with Iron Cross a while back. Each head unit is different so there is no one size fits all volume setting when tweaking gains.
Maybe put the scope on the output of your phone to see what your peak to peak voltage is with a 1 KHz test tone. If it is down around 4 volts or so maybe the LD-10 would be worth a try. It boosted the 4v output of my stock head unit to almost 9v peak to peak with no clipping at all. If I turned the adjustments of the LD-10 higher the voltage didn't increase but the wave form definitely clipped. I was definitely pleased with the increased volume from my rear speakers after taking the time to set the LD-10 properly.
Maybe put the scope on the output of your phone to see what your peak to peak voltage is with a 1 KHz test tone. If it is down around 4 volts or so maybe the LD-10 would be worth a try. It boosted the 4v output of my stock head unit to almost 9v peak to peak with no clipping at all. If I turned the adjustments of the LD-10 higher the voltage didn't increase but the wave form definitely clipped. I was definitely pleased with the increased volume from my rear speakers after taking the time to set the LD-10 properly.
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Grand HDF Member
Joined: Sep 2017
Posts: 3,704
Likes: 915
From: Southern Virginia
Did that, and if I remember correctly... it was right around 1.2v-1.5v.
Cruiser
Joined: Nov 2017
Posts: 207
Likes: 11
From: Alabama
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