Logic7 Amplifier retrofit

Hotter · 01-26-2021, 02:13 AM

Hi, did anyone retrofit Logic7? Is it ok to power it directly from the battery?
Wont it consume a lot of power when car is not driven? Because originaly it is powered from fuse box which cuts off power after 30mins.

haaken675 · 02-09-2021, 10:29 AM

THis is a genuine question. Why would you want to retrofit the logic 7 system? It would seem like it would be significantly easier to put in a good quality aftermarket amp and a processor if you feel so inclined then trying to retrofit the fiber optic loop setup, amp, etc.

ctuna · 02-09-2021, 10:36 AM

Amplifiers draw power based on the there Class and the amount of signal
they are getting and output load. There are all kinds of circuitry to make them more effiecient
now also and Class D amps are ultra efficient.
But what the last guy said you can get better sound with aftermarket stuff.
And it's easier to install.
Yes the car goes to sleep read the first pdf.

electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...4276,d.cGUgoes

Hotter · 02-09-2021, 10:46 AM

Quote:

Originally Posted by haaken675

THis is a genuine question. Why would you want to retrofit the logic 7 system? It would seem like it would be significantly easier to put in a good quality aftermarket amp and a processor if you feel so inclined then trying to retrofit the fiber optic loop setup, amp, etc.

I have already installed it. Just want to confirm if its ok or not to power it directly from battery.

ctuna · 02-09-2021, 01:43 PM

I think BMW switches the Power from the stock harness .
If you hook it directly to the battery it won't be switched.

david in germany · 02-09-2021, 02:14 PM

The harness I have to do the retrofit in my wife’s 328i does in fact have a connection for the battery. So, yes, directly to the battery.

david in germany · 02-09-2021, 02:16 PM

Quote:

Originally Posted by haaken675

THis is a genuine question. Why would you want to retrofit the logic 7 system? It would seem like it would be significantly easier to put in a good quality aftermarket amp and a processor if you feel so inclined then trying to retrofit the fiber optic loop setup, amp, etc.

Decent sound and a OEM option that will last the life of the car(normally).

GtiGyver · 06-28-2021, 11:46 AM

Doesn't the logic7 amp pull power from the main power distribution block in the glove compartment?
Pretty sure its fuse 15 (20A)

ptpending · 06-28-2021, 01:40 PM

the logic7 amp usually powered from fusebox but individual amp can powered from fusebox and from battery junction plate
and these amps have remote power circuit or powered on by most signal
so that means that it is possible to power logic7 amp from battery junction

GtiGyver · 06-28-2021, 02:17 PM

Quote:

Originally Posted by ptpending

the logic7 amp usually powered from fusebox but individual amp can powered from fusebox and from battery junction plate
and these amps have remote power circuit or powered on by most signal
so that means that it is possible to power logic7 amp from battery junction

That's what I thought.
And to be clear, these amps (L7 and DIRAC) use the MOST bus for remote on, so don't go looking around for a remote wire. There isn't any.

GtiGyver · 06-28-2021, 02:19 PM

The question I have is, if you're upgrading from the HiFi amp to a L7 amp, can't you just use the same power wire since they both appear use the same F15 fuse (20A) ?

ptpending · 07-20-2021, 07:02 AM

It can be, but i think fuse should be upgraded.

GtiGyver · 08-31-2021, 10:35 AM

Just did it myself in my 328i. From HiFi to L7. Kept the same power wires and fuse.
No issues.

Had to make my own retrofit cable, which was fun... :s

Just need to finish running the center speaker wire all the way to the back in the trunk. Still sounds good without it though.

01-26-2021, 02:13 AM	#1
Hotter First Lieutenant 72 Rep 381 Posts Drives: BMW E92 328i -> 330i Join Date: Feb 2018 Location: Lithuania iTrader: (0)	Logic7 Amplifier retrofit - power supply question Hi, did anyone retrofit Logic7? Is it ok to power it directly from the battery? Wont it consume a lot of power when car is not driven? Because originaly it is powered from fuse box which cuts off power after 30mins.
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02-09-2021, 10:29 AM	#2
haaken675 First Lieutenant 101 Rep 304 Posts Drives: 24v turbo e30, e92 335i Join Date: Feb 2020 Location: FL iTrader: (0)	THis is a genuine question. Why would you want to retrofit the logic 7 system? It would seem like it would be significantly easier to put in a good quality aftermarket amp and a processor if you feel so inclined then trying to retrofit the fiber optic loop setup, amp, etc.
	Appreciate 0 Quote

02-09-2021, 10:36 AM	#3
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Amplifiers draw power based on the there Class and the amount of signal they are getting and output load. There are all kinds of circuitry to make them more effiecient now also and Class D amps are ultra efficient. But what the last guy said you can get better sound with aftermarket stuff. And it's easier to install. Yes the car goes to sleep read the first pdf. electical e90 pdf http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja http://www.google.com/url?sa=t&rct=j...85464276,d.cGU http://www.google.com/url?sa=t&rct=j...4276,d.cGUgoes
	Appreciate 0 Quote

02-09-2021, 01:43 PM	#5
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	I think BMW switches the Power from the stock harness . If you hook it directly to the battery it won't be switched.
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02-09-2021, 02:14 PM	#6
david in germany Lieutenant Colonel 729 Rep 1,815 Posts Drives: 118i, 335i and 328i Join Date: Nov 2011 Location: Mannheim Germany iTrader: (2)	The harness I have to do the retrofit in my wife’s 328i does in fact have a connection for the battery. So, yes, directly to the battery. __________________ 2009 118i Monaco Blue "Maximillion" 2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car
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06-28-2021, 11:46 AM	#8
GtiGyver Lieutenant 69 Rep 460 Posts Drives: 2009 Space Grey E90 328i MT Join Date: Jun 2009 Location: Montreal iTrader: (3)	Doesn't the logic7 amp pull power from the main power distribution block in the glove compartment? Pretty sure its fuse 15 (20A)
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06-28-2021, 01:40 PM	#9
ptpending Colonel 456 Rep 2,749 Posts Drives: e91 Join Date: Dec 2013 Location: Poland iTrader: (1)	the logic7 amp usually powered from fusebox but individual amp can powered from fusebox and from battery junction plate and these amps have remote power circuit or powered on by most signal so that means that it is possible to power logic7 amp from battery junction __________________ E81 2007 130i 6cylinder Montego blue Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.
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06-28-2021, 02:19 PM	#11
GtiGyver Lieutenant 69 Rep 460 Posts Drives: 2009 Space Grey E90 328i MT Join Date: Jun 2009 Location: Montreal iTrader: (3)	The question I have is, if you're upgrading from the HiFi amp to a L7 amp, can't you just use the same power wire since they both appear use the same F15 fuse (20A) ?
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07-20-2021, 07:02 AM	#12
ptpending Colonel 456 Rep 2,749 Posts Drives: e91 Join Date: Dec 2013 Location: Poland iTrader: (1)	It can be, but i think fuse should be upgraded. __________________ E81 2007 130i 6cylinder Montego blue Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.
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08-31-2021, 10:35 AM	#13
GtiGyver Lieutenant 69 Rep 460 Posts Drives: 2009 Space Grey E90 328i MT Join Date: Jun 2009 Location: Montreal iTrader: (3)	Just did it myself in my 328i. From HiFi to L7. Kept the same power wires and fuse. No issues. Had to make my own retrofit cable, which was fun... :s Just need to finish running the center speaker wire all the way to the back in the trunk. Still sounds good without it though.
	Appreciate 0 Quote