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Factory Bose Head Unit to JL Amp connection

Old 01-23-2014, 10:59 AM
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Factory Bose Head Unit to JL Amp connection

Hope in right section here. So I chose to keep factory head unit but now having second thoughts. I have to turn the volume up too high to get the level of bass I like. Wondering if it's due to not enough voltage in the signal going to my amp?

Bose head unit into PAC SOEM-4 line out converter into JL amp. I've also got a bass **** to adjust the subs. I've learned that aftermarket head units have 4 volts on their pre outs. Maybe I'm not getting 4 Volts to my amp?

Source is iPhone 5 cable connected through USB. An idea was to try cd but haven't gone there yet.
Any and all help is appreciated. Thanks!

Last edited by AndrewK; 01-23-2014 at 11:03 AM.
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Old 01-29-2014, 11:04 PM
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Originally Posted by AndrewK View Post
Hope in right section here. So I chose to keep factory head unit but now having second thoughts. I have to turn the volume up too high to get the level of bass I like. Wondering if it's due to not enough voltage in the signal going to my amp?

Bose head unit into PAC SOEM-4 line out converter into JL amp. I've also got a bass **** to adjust the subs. I've learned that aftermarket head units have 4 volts on their pre outs. Maybe I'm not getting 4 Volts to my amp?

Source is iPhone 5 cable connected through USB. An idea was to try cd but haven't gone there yet.
Any and all help is appreciated. Thanks!
You nailed it, a line out converter will not produce signal voltage to the amp.
2 ways around that, you get a new aftermarket headunit or get a Digital Sound Processor like a JBL MS-8 that is capable of converting the signal to 3 volts.
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Old 01-31-2014, 11:35 PM
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Originally Posted by gramser57 View Post
You nailed it, a line out converter will not produce signal voltage to the amp.
2 ways around that, you get a new aftermarket headunit or get a Digital Sound Processor like a JBL MS-8 that is capable of converting the signal to 3 volts.
Thanks. That MS-8 is a fair bit of money. I figure for a bit more it would be better to get a new head unit and start off with a strong, clean signal. I'm going to check the voltage at my RCA's next chance I get. I'm just curious.
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