11-17-2019, 07:37 PM | #1 |
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Hi Fi Under seat sub upgrade
Hi all,
Does any one have any recommendations for the best direct fit under seat sub upgrade over Hi Fi sound system in m235i? A lot of threads are based on improvements over HK system. I won't be changing the amp either. Alternatively, if you could only do one - would changing out the speakers or changing out the amp for something like bimmer tech's harness the best audio performance improvement? I find the low 20-60hz area on the m235i to be no existent.
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11-18-2019, 09:07 AM | #3 |
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Lozza47,
I just upgraded my M240i with the HiFi system by only changing the speakers. A local car audio shop installed the Bimmer Tech Alpha One speakers (woofers, tweeters and midrange). They also swapped out the blank sails with the HK ones to hold the tweeter. The changes have been dramatic and everything sounds great now. I don't feel there's any need to update the amp to great sound if you switch out the speakers. |
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11-22-2019, 12:14 PM | #4 |
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The Earthquake SVS were a good improvement on my car with HIFI. Cost less than the Ghosts.
An amp with some DSP capability should help a lot and will be my next move. 20 to 60 hz IS non existent in the HF because they put in lower quality subs and EQ it out in the crappy amp. The HK is only slightly improved. |
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11-22-2019, 12:27 PM | #5 |
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If you want best low-cost, low-hassle option get this for your trunk along with the remote. See TechnicPNP for the add an amp harness.
https://www.crutchfield.com/p_136933...v3.html?tp=114
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11-24-2019, 05:43 AM | #6 | |
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11-24-2019, 04:30 PM | #7 | |
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11-26-2019, 03:04 PM | #8 |
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Integral Audio does parts specifically for BMW. Their underseat woofers are amazing for the price, they're listed as for the 3 series but I installed them in my M235i with the "HiFi" system and they fit perfectly. Sound upgrade is amazing, they're usually on sale for about $250 for a pair with adapters and spacers. Easily the best value option available at that price and likely one of the better sounding.
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11-27-2019, 04:57 AM | #9 |
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Good to know, probably going to try those out! The earthquakes also look interesting. What would be the best drop in amp valuewise to push the hifi and 300-500watt subs? 2017 m240i prelci
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11-28-2019, 03:30 PM | #10 | |
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https://www.bimmerpost.com/forums/sh...php?p=25326809 |
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11-28-2019, 08:51 PM | #11 |
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11-28-2019, 08:58 PM | #12 | |
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(since removing/unplugging the center channel is free: do this too). If you were to do that single thing but a touch fancier, move that coax to separates/components with passive crossover and the OEM sail panels to house the tweeter. Either way, with the door card off dampen the door before reassembly. Those front door speakers are the single weakest area in the car. Seth P.S. the summary from the million threads on audio for 'proper' upgrade path is: 1) remove front center speaker 2) replace door speakers with coax* and dampen doors 2a) *component 3) replace rear fill w/passive coax 4) replace amp 4a) replace amp/processor 4b) replace amp/processor/run active crossover not passive 5) replace subs 5a) remove subs and use trunk sub instead 5b) bandpass filter underseat subs and use trunk sub for low fill |
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12-02-2019, 01:27 PM | #13 |
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Sethwas has a great list here:
I did 1), 2a) and 5) so far. I agree that the Amp has to go at some point, and some equalization control would be a give help, so 4a) would be it for me. The reason I did the subs first is the cost of a decent amp is well over $1000CDN while subs were less than $300. The base is pretty good with the earthquakes, but the stock equalization tuning in the HIFI system is terrible once you have installed components and better subs. |
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12-03-2019, 10:55 AM | #14 | |
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Seth |
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12-04-2019, 03:25 PM | #15 | ||
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I just recently installed some Hertz 100.3 coax speakers. They are awesome. I'll put a review up shortly. I also added a foam spacer around the edges to direct the sound through the grills better due to the lower mounting position. The high frequencies are a bit harsh only due to the amp I would imagine and the original bmw speakers not having tweeters so the amp pushing the signals up.
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12-07-2019, 10:51 PM | #17 |
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Also, do you know how I can test the speaker phase, while the door cards are installed?
I have a gut feeling they're out of phase but it's so hard to tell.
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12-09-2019, 01:27 PM | #18 |
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https://www.richardfarrar.com/are-yo...red-correctly/
there are 3 different mp3 files you can play on your phone over bluetooth while sitting in the car. When you hear them, by the 3rd one (the phase test) you can tell if the speakers are out of phase or not. Seth |
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12-14-2019, 09:58 AM | #19 |
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