Quote:
Originally Posted by Billfitz
The main advantage to H-K over Hi-Fi is that H-K has a better EQ. However, it's still not all that good. The best upgrade is to an amp that has better EQ, like the Audiotec Fischer Match Up 7 BMW. There are plenty of threads about that. As for speakers, the doors are fine, the best choice for underseats if you don't have a trunk sub is the SWS Earthquake, 2 ohms, which the Match Up 7 BMW amp has sufficient power to drive.
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Below is a section from a recent post that I wrote with details about the Earthquake Underseat Subwoofers that Billfitz mentioned. Hope this helps!
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EARTHQUAKE PART NUMBERS/ PRICING
The best price that I found on the Earthquakes was on Walmart online for $109 each, but the same reseller is now selling them on Amazon for $109 also. Make sure to get the 2-ohm model, SWS-8Xi.
You will also need a pair of spacer rings. There are two kinds based on wiring connection.
1) Earthquake sells them for ~$22/pair. (Part# R8SWS) They have spring loaded posts in the stock location that make it easy to connect your own speaker wiring. I used these along with 14 gauge twisted speaker wire.
https://www.amazon.com/Earthquake-So.../dp/B00G2MKGOU
Shielded wire would have been even better. I wanted to upgrade from the car's speaker wire which was probably 16g or 18g, because I was putting more power to the underseat subs. The newtis website was helpful in understanding how to remove interior panels which was easier than I expected. Just only do one side of the car a time so you have the other side to refer to to put things back together.
2) Technicpnp sells spacer rings that have OEM wiring connectors on them in the OEM wiring location. This makes it simple to reuse the stock car wiring to the underseat subs. They are $65/pair but well worth it.
https://technicpnp.com/product/sws-8...er-connectors/
EARTHQUAKE UNDERSEAT INSTALLATION
This cheap plastic trim tool kit was helpful.
https://www.harborfreight.com/Trim-A...-Pc-64126.html
This metal tool was helpful
http://www.walmart.com/ip/Hyper-Toug...4008/443274151
Watch this video starting at 14:16 to see how to physically install the Earthquakes
Tips: it helps to use the electric motor control to slide the seat forward and back to access the four hold down bolts. I trimmed the edges of my factory carpeting back with scissors so it didn't interfere with the subs.