For BMW owners, everyone knows a little bit about the audio of Harman Kardon, and then Lao Guo will share with you the **BMW 3 Series upgrade Harman audio homework.
Construction Accessories: Harman Kardon's complete 16-speaker top-of-the-line system.
4 tweeters (front door A-pillar + rear door).
4 midrange speakers (front door 2 + rear door 2).
Center speaker (1 high + 1 medium).
2 woofers (front seats).
2 pairs of backstage speakers (2 high, 2 medium).
Power amplifier 1 x 600 watts.
The Harman Kardon amplifier of the **3 series has been remodeled to 1 large and 1 small 2 amplifiers. The total power is still the same, 600W,
All products. 
7 trebles. 
7 altos. 
2 basses. 
2 amplifiers, one large and one small.
Rear shelf cover.
2 rear table covers, with a total of 2 treble and 2 midrange.
The rear door handle treble position needs to be replaced.
Rear door panel bell cover.
True or false Harman, the owner's original car has been changed to 2 bass, and the unscrupulous merchant said that it was **, and after removing it, I knew that the fake was too thorough.
This is the bass changed by the owner of the dismantled car, fake, look at the solder joints. After the solder joints are oiled.
* Solder joints. There's also one that the Harman bass is particularly good when pressed, while the fake bass is hard,。。 The feel is very different when you press it, and after more than 10 years of modification and upgrading of BMW, the degree of counterfeiting of fakes is also constantly escalating, and it is indeed difficult to distinguish between the real thing and the real thing.
Well, don't talk nonsense, continue our modification and upgrading, as we all know, the role of the HUD head-up display is to project important driving information such as navigation, FM, songs, speed, speed limit information, etc., onto the windshield in front of the main driver, and the driver can see important driving information such as speed and navigation without looking down. to avoid distractions from the road ahead. Eye strain can be avoided.
In addition, the BMW head-up display system also has adjustable height, brightness, and tilt to ensure that information is projected into the driver's head-up range, so that the driver can read the information faster while focusing on the road.
This is an LCD meter that does not support HUD, and there is one less interface in the back.
The LCD instrument that supports HUD and the LCD instrument that does not support HUD in the original car lacks an interface on the back.
Prepare to dismantle the center console and punch holes.
Tear down the central control. The original car reserved position for the power amplifier.
Head-up display. High allocation hunch.
A well-perforated center console.
Plug in the HUD interface meter.
Punch good results.
Head-up display effect, no replacement glass effect.