|
|
|
09-19-2008, 11:49 PM | #1 |
135i Coupe Owner!
46
Rep 1,009
Posts |
Specs on the stock headunit?
Does anyone have the technical specs on the stock 135i headunit for me? I appreciate it!
__________________
2008 BMW 135i Coupe
|
09-20-2008, 09:44 PM | #2 |
Ronnie
15
Rep 556
Posts |
There's a document in the sticky at the top of this topic. But here is the address:
http://www.1addicts.com/forums/attac...1&d=1207504825 Being SoCal, the stock headunit in the 135i is called the Hi-Fi in this document. 10 speakers, and an amp in the trunk.
__________________
"Lucy" 128i / Sedona Red / Coral Red / Premium Package / Premium Sound |
Appreciate
0
|
09-22-2008, 07:49 AM | #3 |
135i Coupe Owner!
46
Rep 1,009
Posts |
Are there any specs on the stock headunit? I'm interested in preouts and voltages specifically..
__________________
2008 BMW 135i Coupe
|
Appreciate
0
|
09-22-2008, 09:04 AM | #4 |
Private First Class
8
Rep 127
Posts |
There are no preouts.
In a non logic 7 system you can use the headunit outputs which are approx 4V. This link is a good read. http://www.unitedbimmer.com/forums/c...k-stereos.html If you have a logic 7 unit you can only hook up aftermarket equipment from the factory amplifier outputs. |
Appreciate
0
|
09-26-2008, 06:36 AM | #5 |
135i Coupe Owner!
46
Rep 1,009
Posts |
404 error file not found
I'm not familiar with BMW audio at all. I assume I have a non logic 7 system if I didn't go with the premium sound in my 135i? I have an entire audio system that I removed from my previous car but I don't want to run my aftermarket headunit. I'm just trying to figure out a way to hook my amps/components/subs up to the stock unit
__________________
2008 BMW 135i Coupe
|
Appreciate
0
|
09-26-2008, 10:05 PM | #6 |
Lieutenant
20
Rep 564
Posts |
Go to the internet time machine to find a small article that was attempted to be linked above:
http://web.archive.org/web/200801021...k-stereos.html Originally Posted by Bob Hazelwood I am suprised that more people STILL do not know what is going on in BMW audio systems. Heck, until the dreaded DSP came along they really haven't changed much in years! First. The head unit does not "suck". In "objective" terms, the response range, dynamic range, FM tuner capability etc of the BMW head unit is comparable to some of the better aftermarket units. I've had quite a few units on the test bench as the result of my previous two jobs (VP Product management as a/d/s/ and Product and Marketing Manager for Mobile Audio at JBL). The characteristic which can give you the wrong impression if you don't take it into account when adding upgrades, is that the BMW head unit is equalized. There is a bass boost which varies with level, and the top end is rolled off. This is the cause of the big change you hear with a new head aftermarket unit while keeping the BMW amp and speakers. If you know this going into an upgrade exercise, you can compensate for it in the system design and get superb results using the factory head unit/CD changer. Output voltage is most definitely NOT .2V as stated. Actual clipping occurs at around 5V., ( I measured 5.25V on the bench on the Pioneer unit from my E34. I have measured similar output from various Alpine heads from E36's) so I would call it a nominal 4V unit (making allowances for low battery voltage under some conditions). So there is plenty of available output voltage to put into an aftermarket amp with low noise and high fidelity. At the same time, even if it wasn't this high, the output voltage has little or no effect on the sound quality other than the level of background hiss. All it effects is where you have your input sensitivity controls set on the amp. With a high voltage head unit, you can keep the input gain controls turned down, making the amp less susceptable to noise pickup. Issues such as frequency response, distortion, separation etc. have absolutely nothing whatsoever to do with the head unit's output voltage. Matt correctly in that the BMW head unit reduces bass at high levels. More specifically it does not "cut" bass, but reduces bass "boost". This helps save speakers at high volumes, and if you calibrate the amplifier adjustments of add-on equipment well, it can work in your favor by adding a very useful loudness compensation, where bass is boosted at low levels to compensate for road-noise masking and the ear's reduced sensitivity to bass at low levels. Second. There is no crossover in the BMW head unit!(at least in the USA). The crossover is in the BMW amp. It is a passive crossover at the output of the four-channel amp. There is nothing high-tech about this, it's a regular old passive crossover made from run-of-the-mill capacitors and inductors. They are just located inside the amp chassis instead of between the amp and the loudspeakers. And no, it's not ten 25W channels. The amp is four channel, and by Hi-Fi standards puts out 15W/channel. Yep, that's all folks. The crossover for each corner of the car is at the output of each channel, and divides the spectrum appropriately for the drivers on that channel. The only problem with this set-up is that you don't have a powered full range output to drive aftermarket speakers that you can get to with without tearing the amp apart and making an internal connection. This pretty much forces you to replace the amp as part of a speaker replacement just so you can get a full-range signal. The E39 DSP system is another animal all together, which is beyond anything you probably want to consider upgrading. Its possible, but not easy. So, the bottom line is that if you find that audio performance is important to your vehicle enjoyment, there are alternatives to having to gut the entire system which can give superb results IF you know the quirks of the BMW system going in. If you treat it like the system in a Honda or Chebbie when you try to upgrade your system, you'll be disappointed. Best regards, Bob Hazelwood Product Manager, Cambridge Soundworks '93 525i 5-sp. Sharked, BL/ss'd, H&R + Bilsteins a/d/s/ 335is front, A5is rear, 310rs sub, P2110 sub amp, P840 main amp, Factory Pioneer head unit and CD BMW CCA (Boston) |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|