Ben James
Well-Known Member
- Joined
- Oct 19, 2018
- Threads
- 1
- Messages
- 83
- Reaction score
- 92
- Location
- Queensland, Australia
- First Name
- Ben
- Vehicle(s)
- 2018 S550 Mustang GT
- Thread starter
- #1
I’m not sure if this has been mentioned in the forums already, but I was playing around with sub bass tone sweeps from my iPhone and discovered something interesting.
When I was doing bass sweeps wirelessly I had no problems going all the way down to 20hz which was playing through the subs as it should.
i decided to connect my iPhone so it was wired in (to use Apple CarPlay). When I went to do some bass sweeps I noticed that there was a massive bass roll off below 60hz.
I estimate that Apple CarPlay applies a 24db 50-60hz high pass which I verified with the frequency generator.
as soon as I disconnected from CarPlay and went back to a wireless (Bluetooth) connection the bass when back to a flat response.
For reference I’ve reset the response curve through Forscan so it’s hex is at 00 at address 727-01-02 (which means the APIM/ACM send out a dead flat EQ curve).
Just for info.
When I was doing bass sweeps wirelessly I had no problems going all the way down to 20hz which was playing through the subs as it should.
i decided to connect my iPhone so it was wired in (to use Apple CarPlay). When I went to do some bass sweeps I noticed that there was a massive bass roll off below 60hz.
I estimate that Apple CarPlay applies a 24db 50-60hz high pass which I verified with the frequency generator.
as soon as I disconnected from CarPlay and went back to a wireless (Bluetooth) connection the bass when back to a flat response.
For reference I’ve reset the response curve through Forscan so it’s hex is at 00 at address 727-01-02 (which means the APIM/ACM send out a dead flat EQ curve).
Just for info.
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