[johnung]

Originally Posted by Billfitz

Those aren't RCA, they're binding posts, like these:
https://www.parts-express.com/parts-...pair--091-1152

RCA plugs and jacks should never be used for speaker connections, as that would make it much too easy to connect the output of an amp to the input of a receiver, CD player or whatever, with the result being magic smoke.

You'd use the Technicpnp if you're using the stock wiring to the woofers, the Earthquake if you're putting in the heavier gauge wire that they should be used with.

Thanks for heads up, Bill. I never zoomed in on the photo to realize that they are binding posts. My brain just glanced at the photo and assumed that they were RCA's. Binding posts are much better because I already ordered the Earthquake rings and 14 gauge wire to run from the new secondary amp in the trunk to the new Earthquake subs. Looking forward to installing this as soon as all of the parts arrive!

[delecz]

Originally Posted by HansC.

Sorry for seeing your post late - Yes, I had the same issue. My amp was replaced twice; first due to the amp completely forgetting DSP settings and the second time because of the master volume going down over time - strange behavior. I btw just just swapped the car for a 2019 X3M40i so a new owner will be enjoying the upgrade.

/HC

I see. Looks like an issue which has hit many people who bought the amp. Seems like the newest revisions are sorted. I'm glad the sound it producers and happy with it now.
You seem generous to leave the system in when you sold the car. I'm sure the new owner will be very happy!

[TayF80]

Originally Posted by johnung

I've run across two different spacers for use under the front seats in a BMW with the Earthquake 8" subwoofers- either the SWS-8X (4-ohm) or SWS-8Xi (2-ohm).

1) made by Earthquake, this spacer has two RCA receptacle jacks on the side with two pigtail wires to connect to the subwoofer. This would work well if you are using RCA speaker output jacks from your amp or Line Output Conditioner. Cost is $20/pair. Earthquake part number R8SWS

2) made by Technicpnp. These appear in photos to be a little more substantial. Instead of RCA jacks, this spacer has a stock receptacle that matches the plug on the stock BMW Subwoofer wires. This would be easiest to use if the intention is to replace the stock underseat subs with Earthquake subs. I am not clear on whether the stock BMW subs are 2-ohm or 4-ohm so choose your Earthquake model carefully. $65/pair Part# SWS-8

I read that subs under the seats at 7ohm...

[johnung]

Originally Posted by TayE90

I read that subs under the seats at 7ohm...

I don't know. The stock subs don't matter because they were replaced. I used the 2-ohm Earthquakes and powered them with their own dedicated AudioControl amplifier with 2 channels X 150 watts into 2-ohms.

[Af32]

Originally Posted by Billfitz

The Earthquake is one of the very few woofers that will actually outperform the stock under seat woofers, but it needs power to do it, preferably 150 watts each. A separate amp would be best. As for clarity, that's not a sonic characteristic below 150Hz, so it's a non-issue.

I have the Match 7up amp and am going to replace the stock subs with the 2 ohm earthquake subs. I have the limosine tune running right now was wondering how best to modify the tune for the subs. Also the p has a Max output of 160 w at 2 ohms and the earthquakes are maxed at 150w do I need to change the one to cap the Max output?

[chrbmw]

Originally Posted by Af32

I have the Match 7up amp and am going to replace the stock subs with the 2 ohm earthquake subs. I have the limosine tune running right now was wondering how best to modify the tune for the subs. Also the p has a Max output of 160 w at 2 ohms and the earthquakes are maxed at 150w do I need to change the one to cap the Max output?

Do you have any update on how they perform vs the standard hifi subs?
I am considering to upgrade mine, but I'm not sure yet.

[Af32]

Originally Posted by chrbmw

Do you have any update on how they perform vs the standard hifi subs?
I am considering to upgrade mine, but I'm not sure yet.

Installed the woofers and it's a huge upgrade from stock.

I agree with everyone that you loose some mid range bass but the gains on the low end make it worth it.

The match amp feels like it has more than enough power to drive the woofers.

Def worth the $250-300 it cost

[Billfitz]

Originally Posted by Af32

I agree with everyone that you loose some mid range bass

Actually, you don't. The Earthquake has lower sensitivity than stock across the board. That's the price paid for its ability to go lower. In order to compensate for that you need more power than the stock amp, and the ability to turn up the overall gain or EQ on the sub amplification channels.