! Help understanding How Alpine AMP works

Dwtk · 08-26-2015, 07:17 AM

Hi guys

I need some help understanding how the HIFI Alpine upgrade amp works. I have fitted it as usual and it works fine . But I felt the subs were underpowered so bought a new amp for the SUBS only. That left my the bass outputs on the alpine amp unused so I decided to try connect them to the rear left and right . But there is some sort of crossover happening that is not allowing Mid and highs through.

My question : Is the amp doing the filtering / crossover on these speaker outputs or is done by the Stereo its self . My stereo is aftermarket ( Zenec 3215 ) the door speaker are all connected through the the standard BMW harness. The subs with new amp and connected via RCA's from stereo.

below is my desired future state.

makkan00 · 08-27-2015, 04:24 PM

Alpine amp has low pass filter in the amp so unfortunately, you cannot by pass it (unless you are amp doctor!).

Dwtk · 09-29-2015, 06:59 AM

thanks buddy thought so . I have now installed everything . But people on this forum are right the Earthquakes dont produce any midbase. Thinking of mounting the old subs along side the earthquakes as Iam running the earthquakes on a separate amp. My install is a mess should have done me research before going ahead. Any ideas of alternative mounting locations for old subs except for boot . Was thinking footwell ?

08-26-2015, 07:17 AM	#1
Dwtk Enlisted Member 5 Rep 39 Posts Drives: 118d sport Join Date: May 2012 Location: Surrey iTrader: (0)	! Help understanding How Alpine AMP works Hi guys I need some help understanding how the HIFI Alpine upgrade amp works. I have fitted it as usual and it works fine . But I felt the subs were underpowered so bought a new amp for the SUBS only. That left my the bass outputs on the alpine amp unused so I decided to try connect them to the rear left and right . But there is some sort of crossover happening that is not allowing Mid and highs through. My question : Is the amp doing the filtering / crossover on these speaker outputs or is done by the Stereo its self . My stereo is aftermarket ( Zenec 3215 ) the door speaker are all connected through the the standard BMW harness. The subs with new amp and connected via RCA's from stereo. below is my desired future state.
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08-27-2015, 04:24 PM	#2
makkan00 Major General 886 Rep 9,097 Posts Drives: F83 and F36 Join Date: Dec 2011 Location: Essex iTrader: (56)	Alpine amp has low pass filter in the amp so unfortunately, you cannot by pass it (unless you are amp doctor!). __________________ F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play
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09-29-2015, 06:59 AM	#3
Dwtk Enlisted Member 5 Rep 39 Posts Drives: 118d sport Join Date: May 2012 Location: Surrey iTrader: (0)	thanks buddy thought so . I have now installed everything . But people on this forum are right the Earthquakes dont produce any midbase. Thinking of mounting the old subs along side the earthquakes as Iam running the earthquakes on a separate amp. My install is a mess should have done me research before going ahead. Any ideas of alternative mounting locations for old subs except for boot . Was thinking footwell ?
	Appreciate 0 Quote