M3P subwoofer replacement

[Andres Celis]

Hi, this is my first post so please bear with me and thank you for your time.

I just got a 2023 M3P and it’s great but I’d love to change the subwoofer. I’m not looking to change the amp as I feel the change in sound doesn’t need to be too drastic for my needs.

I’m looking at the Infinity REF-FLEX8D 8" Dual 2-ohm Subwoofer (150 watts rms and 600 max) which is somewhat alarming since it’s 2 ohms and not 4 like the OEM one and I’m not sure how the OEM amp will react.

I could also buy the alpine speaker promoted by hepaking that’s 4ohms but it uses a ferrite magnet.

Is anyone aware of an 8-inch sub that is 4-ohm dual voice coils that make use of a neodymium magnet?

Could someone with more expertise let me know if it’s safe to use the 2-ohm sub as a replacement for the OEM one, thanks.

 

[Sellout]

You need a dual voice coil 4 ohm sub if you want to use the factory signal. I just ordered an Alpine 8” and the metra adapter from Amazon to replace mine. Total cost was like $170.

 

[DocHolliday]

You need a dual voice coil 4 ohm sub if you want to use the factory signal. I just ordered an Alpine 8” and the metra adapter from Amazon to replace mine. Total cost was like $170.

Interested in this. Did you do the swap?

 

[Sellout]

I did, and it sounds quite good, tbh. It’s still just an 8” sub but it works quite well in the factory enclosure. I do still want some more deep bass, down under 40hz, but I think I can get enough with some additional power.

Modeling them in WinISD makes it quite obvious why the alpine sounds better too. I’ll have to post a thread about it when I get some time. @RWAudio was kind enough to measure the T/S parameters of the factory subwoofer for me and I was able to plot the expected frequency response graphs using his enclosure data. The results were surprising. I’ll try to put together a post with some data as soon as I get a chance.