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      11-16-2014, 09:09 PM   #1
Technic
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Notes on a 2015 F30 335i HiFi system with Arc Mini amps and Hertz component

My sister shows up with a 2015 F30 335i HiFi asking for the same kind of upgrade as in her old E92 328i.

I suggested a pair of Arc KS 125.4 amps Mini and a set of Hertz (2) EMV 100.5 mids, (3) ET 20 tweeters and (2) DX300 2-way crossovers. The two amps to take care of all the OEM 7ch (including center speaker) and the Hertz set to fix the lackluster front OEM component set response. A third ET 20 tweeter was added to the OEM center mid for more voice clarity using a leftover OEM cap/connector for a 100% PnP install (not shown).

Hertz EMV100.5 in custom F30 mounting bracket, ET 20 and DX300 2-way crossover:



Front install:





Arc Mini install -harness connection and layout:











Custom staggered mount:


Notes:

1. Fully 100% PnP. Other than removing the trunk storage bin under the trunk floor, no trunk panel was removed, making this install one of the quickest and easiest to complete once other parts were pre-made.

2. Arc 125.4 amps configurations are:
- Amp #1 CH1/CH2 150Hz HP, 1/8 gain = Front
- Amp #1 CH3/CH4 bridged 200Hz HP min gain = Center
- Amp #2 CH1/CH2 150Hz HP, min gain = Rear
- Amp #2 CH3/CH4 200Hz LP, ~10dB Bass Boost, 1/4 gain = underseat woofers
- Both amps set for signal sensing turn on. 100% turn on by balanced inputs and turn on/off follows exactly the OEM amp on/off pattern.

3. Sound? Much clearer, much louder than OEM HiFi. The front component set replacement makes all the difference, and in less effect the addition of a center speaker tweeter. Clear voices were back all across the dash, solid bass at all volumes from the OEM woofers.

Setting the front Hertz component gain a little higher than the center, plus lower front HP crossover point compensated the much higher power of the center channel; no overwhelming sound coming from the center even when making a phone call via Bluetooth. These new Hertz mids frequency response starts at 80Hz and have a sensitivity of 91 dB SPL, which make the audio response level coming from them quite significant at lower volume.

Considering that this is a non-DSP system I would say that it is an excellent upgrade for the money and effort.

My sister is again happy...
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Last edited by Technic; 11-17-2014 at 08:35 AM.
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      11-16-2014, 10:52 PM   #2
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How much did these components cost? I rarely listen to the radio, but if the HiFi is as bad as people say, I may need to upgrade it anyway. It can be easily removed, correct? My car is a lease.
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      11-17-2014, 08:33 AM   #3
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Check your local Hertz audio dealer for speaker prices.

HiFi is as good or as bad sounding as you determine. To me and to my sister the F30 HiFi system is not a good system at mid/high volumes. No clarity, bass clips easily, OEM tweeters are mediocre. All that was fixed with this upgrade.

As stated above, 100% PnP and 100% reversible back to stock.

Quote:
Originally Posted by Mike_L View Post
How much did these components cost? I rarely listen to the radio, but if the HiFi is as bad as people say, I may need to upgrade it anyway. It can be easily removed, correct? My car is a lease.
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      11-17-2014, 11:56 AM   #4
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Nice, clean, simple. I like it

Couple of questions:
-What did you make the amp rack out of, and how did you secure them?
-Are you worried about cooling/airflow for the amps?
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      11-17-2014, 01:28 PM   #5
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Quote:
Originally Posted by RocketBoots View Post
Nice, clean, simple. I like it

Couple of questions:
-What did you make the amp rack out of, and how did you secure them?
Rack is MDF, amps are bolted in, and rack is secured with Velcro.

Quote:
-Are you worried about cooling/airflow for the amps?
Arc Mini amps have built-in cooling fans and overheating protection circuitry. They will be fine in there.
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-2007 MK5 GTI United Grey/Grey, DSG: Gone
-2004 E46 M3 Carbon Black/Cinnamon, 6MT: Gone
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      12-04-2014, 04:48 AM   #6
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Great install Technic!
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