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Search: Posts Made By: wpoll
Forum: X5 (E53) Forum 01-27-2019, 11:49 PM
Replies: 65
Views: 7,895
Posted By wpoll
Thanks Crowz - I know all that - I design audio...

Thanks Crowz - I know all that - I design audio amps... But clearly the designers of this system had no concern (or understanding) of the basics of maximum power transfer (efficiency) and impedance...
Forum: X5 (E53) Forum 01-27-2019, 11:45 PM
Replies: 65
Views: 7,895
Posted By wpoll
Exactly - and my apologies for confusing this...

Exactly - and my apologies for confusing this thread but all the info I have indicates that a BM54 DOES in fact act as an amp and I assumed (incorrectly it seems) that no car maker would put two...
Forum: X5 (E53) Forum 01-27-2019, 11:41 PM
Replies: 65
Views: 7,895
Posted By wpoll
Yeah, I get that (I do this sort of thing for a...

Yeah, I get that (I do this sort of thing for a living!) but I still can't believe that the factory setup (in some cases) has two power amps in series.. no wonder it sounds like crap! :rolleyes:
Forum: X5 (E53) Forum 01-27-2019, 11:37 PM
Replies: 65
Views: 7,895
Posted By wpoll
Kinda like what I have in my car - but in my case...

Kinda like what I have in my car - but in my case it's the speaker wires in the dash, not wiring running to a second amp.

But why put two power amps in series? That's just dumb... :confused:
Forum: X5 (E53) Forum 01-27-2019, 11:36 PM
Replies: 65
Views: 7,895
Posted By wpoll
What? If you lift the speaker wires OFF...

What?

If you lift the speaker wires OFF the factory amp and attach them to an android HU via a long loom, why would you have no audio...?
Forum: X5 (E53) Forum 01-27-2019, 11:34 PM
Replies: 65
Views: 7,895
Posted By wpoll
Yep - exactly what I said (about line level...

Yep - exactly what I said (about line level outputs)

I'm going to need to study the wiring diagrams a little closely - this still makes no sense. In a NAV setup, the trunk mounted BM54...
Forum: X5 (E53) Forum 01-27-2019, 11:30 PM
Replies: 65
Views: 7,895
Posted By wpoll
Interesting - that explains why the long loom is...

Interesting - that explains why the long loom is so popular! But it doesn't change the fact that when you unplug the rear factory Amp connector (17-pin or 40-pin) to attached the long loom, it...
Forum: X5 (E53) Forum 01-27-2019, 11:26 PM
Replies: 65
Views: 7,895
Posted By wpoll
Looking at the pics provided by the OP, the line...

Looking at the pics provided by the OP, the line outputs (from the Eonon) are hainging free - no connection. These are what would be used to feed another Amp. The Eonon unit looks to be wired...
Forum: X5 (E53) Forum 01-27-2019, 11:21 PM
Replies: 65
Views: 7,895
Posted By wpoll
Thanks - but kinda hard to see what's going on...

Thanks - but kinda hard to see what's going on there. I was meaning the wiring on the factory amp BTW, as I'd love to see how the heck it's been wired to the Eonon.... :confused:
Forum: X5 (E53) Forum 01-27-2019, 11:19 PM
Replies: 65
Views: 7,895
Posted By wpoll
It varies - I have a factory set up with no NAV,...

It varies - I have a factory set up with no NAV, just a Professional CD up front. the rear cubby and the trunk have no amp - nada. All the speaker wires in the car run up to the front in the dash.
...
Forum: X5 (E53) Forum 01-27-2019, 08:23 PM
Replies: 65
Views: 7,895
Posted By wpoll
Got a picture of the wiring? Unless I'm...

Got a picture of the wiring?

Unless I'm very much mistaken (entirely possible!) it would be very hard to wire a new android head unit in series with a factory amp - it would NOT be a plug and...
Forum: X5 (E53) Forum 01-27-2019, 07:14 PM
Replies: 65
Views: 7,895
Posted By wpoll
In most cases you are no longer using the factory...

In most cases you are no longer using the factory amp if you fit an android head unit; the most obvious exception is with DSP.

If you have only a CD Player and MID unit up front (and no rear...
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