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      10-09-2018, 10:17 AM   #6
jmwilson125
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Drives: 2016 M235i
Join Date: Feb 2015
Location: Somerville, Ma

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Quote:
Originally Posted by Viffermike View Post
If those RFs are drop-in replacements for the underseat drivers, I would NOT power them with a separate amp dedicated only to the underseat drivers. Several reasons for this, all documented in other threads:
- Notice that I'm using the term 'underseat drivers'. They are NOT subwoofers in the traditional sense. They are mid-bass/bass drivers tuned to reproduce some sub-bass frequencies. Even aftermarket speakers tuned to replicate subs such as the RFs and the Earthquake SWS-8 are actually bass drivers, NOT subwoofers.
- Running an amp dedicated only to the underseat drivers will create all sorts of balance and volume issues with the OEM amp's output. Why? Because there is no dedicated subwoofer channel. The HiFi system's head unit only outputs four line-level channels -- LF, RF, LR and RR -- which the OEM amp sums to create three extra speaker-level channels: the two underseat channels and the center channel. The signal that the underseat drivers get is LF and RF, and volume varies as the fader control is moved away from its '0' setting.
- The biggest problem with the 2 Series Audio is clarity across the spectrum. If all you're looking for is bigger bass, the only real solution is a dedicated subwoofer, in a dedicated enclosure, with a dedicated amp and volume control. Technic's Add-an-amp harness for subs makes this possible, as I understand it. But it CANNOT work with the underseat drivers.

Ahhh thank you that clears things up quite a bit. I used to dable in car audio in much simpler time.

I was under the impression then the bavsound ghost subwoofer were a plug and play subwoofer that could be amplified.

I assumed that I could make any other 8" shallow sub fit with some some spacers and fiddling around. Then I would just aplify them down the road. Looks like I should probably cancel that order and rethink the situation.
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