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Thread: Bavarian Soundwerks presents: AMPLIFIER TUNING GUIDE

  1. #26
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    Quote Originally Posted by HK_M3 View Post
    That was great that he took the time to do that write-up!

    A few things to note, distortion will NOT blow your speakers.

    Get test CD that they use in competition (Autosound) and from there you can see if your headunit clips and at what volume. (all settings at flat)

    Through that cd you can also set your amplifiers to max gain with a test tone to insure distortion free music.

    I would not bring the sub past 90hz on the lo-pass side. Anything above 70hz can be localized by the ear.

    For richer mid-bass(male/female) voices up front (depending on the speakers you have) i would bring the high-pass of the fronts down to 60hz.

    -Nate

    Incorrect my friend. Distortion and clipped signals are the 2 main reasons for blowing speakers.

  2. #27
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    Quote Originally Posted by zebrex View Post
    this is one of the first lessons that I learned as professional car stereo installer. underpowering a speaker and sending distortion to it will destroy a speaker faster than poking a screwdriver through it.
    This is very true. People don't seem to ever get this fact either. And yes, it is 'usually' the heat from distorted and clipped signals/output that destroys speakers. The other leading cause is mechanical failure, which can be due to a multitude of issues.
    Last edited by kendogg; 09-13-2006 at 06:47 PM.

  3. #28
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    Quote Originally Posted by sky11 View Post
    What would cause the radio , when tuned to an am station to 1, have an intermittent whine - increases in pitch as speed increases and 2, sound like an bell curve looks at a steady speed. Doesn't happen all the time, the whine is there much more often than the oscellation..
    My guess would be poor antenna grounding. Our antenna's of today are desgined prmarily for FM reception. Could possibly be the antenna groudning in the HU, as well. For the same reasons. I don't know for fact, but, don't BMW's use diversity antenna's?

  4. #29
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    Hi everybody Has anyone changed the rear speaker of a 1996 bmw 328ic convertible. And if you did I mean the big speaker the size is maybe 5inc or so I am not sure. Its the standard size that comes with the bmw not harmon Kardon or bose just the regular speaker. I would like to buy a new one but I dont know how to get to it. Thanks for the help in Advance.

  5. #30
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    can we get the above post removed?
    or put in a new thread?

  6. #31
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    Quote Originally Posted by kendogg View Post
    Incorrect my friend. Distortion and clipped signals are the 2 main reasons for blowing speakers.

    Distortion will not fry your speakers. A clipped signal (and only because of its power spike) will.

    -Nate
    1995 M3 - Gone
    2007 335i Sport - Euro Delivery - Gone
    2009 335i Sport - Gone
    1995 M3 - Gone
    1998 4Runner - Current

  7. #32
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    Quote Originally Posted by Jos View Post
    Sortof.

    If it is set to 100Hz, that is the point at which the signal is 12dB (for 12dB/octave rolloff) lower than the unfiltered signal.
    Not true, it is (well should be) the -3dB cutoff point. The -12dB point is usually used by some loudspeaker manufacturers to make it appear that their speakers will go lower than others. Ever see ads that say:"This sub can go as low as 20Hz! (At -12dB *cough*) It's not a standard measurement.

  8. #33
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    I undertand the clipping ,blah blah but at least if you adjust the amps when the head unit is basically all the way up at lest morons can';t turn it up any farther then it is set at the amps
    1999 BMW 540-MSport Package, 20" American Racing Casino Chrome Wheels, 245/35/20 Sumitomo tires. Full Alpine System IVA-D310, TYPE X MIDS , SUBS AND PDX SERIES AMPS.

  9. #34
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    cd43

    Does anyone have any experience with tuning the CD43 with amplifiers? I count 48 clicks to max volume but it is difficult to tell when the HU begins sending a clipped or distorted signal to my LOC & amps. I am using AudioControl's LC6 for LOC.

  10. #35
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    Hello,
    Is this for BMW original amp only or in general. Also, I will appreciate one advice. I have a sony subwoofer (12 inches). I just need an amp to install it in my car. Any recommendations? Is it a good idea to install it? or it will just put in a lot of base and destroy the balance? If yes, then which amp will be reasonable and easy to install?
    Thank you
    umermariner

  11. #36
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    This is for an aftermarket amplifier. The OEM amp is not "tunable" in this fashion.

  12. #37
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    Truth is, great sound is in the ear of the listener. I haven't found many people who like as much bass as I do. If you can't feel all the bass notes, it ain't good sound to me. I guess that comes from years of playing bass in several bands and playing all kinds of music. If you don't want a good massage from the bass, don't ride with me.

  13. #38
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    HERE IS YOUR ANSWER.

    Distortion is a sign that you are overdriving your speaker.

    When you hear distortion,it means the magnet has no longer the ability to control the coil percisly.
    When that is happening,that means the the coil is also heating up and most likely turning red like your cigarette lighter.
    Sometimes the coil will burn 1 winding and the speaker will die.Sometimes it will play distorted for a long time before it gets hot enought to burn the coil to death

    The more distortion there is,the more heat yuor generating because that is basicly the limit of the speaker.
    You will smell band aids as a warning.Shortly after it will die.

    Distortion per say,dont cause the speaker to overheat.
    The actual Killer is the power that is being pushed into that it can not control or dicipate.

    Its not like distortion will make the coil bounce side to side and hit the windings.


    One more thing I would like to add is about amplifier gain/sensitivity

    If you have adjusted your amps as stated above,then you prly experienced some blown amps after time.Although I have done it that way for 20+years,its not the smartest thing to do.
    The best way to adjust your gain is to measure your output of the Rca in your headunit
    Then adjust your input sensitivity accordingly,because thats what it is.
    An input gain or sensitivity Switch is
    Made to boost low signals
    And
    And regulate high ones.

    WHat about line drivers and epi centers you ask? They boost Db and Hz not Mv/milivolts
    or V/Voltage

    The best step by step instructions would be to google
    JL audio 1000/1 intstall manual.
    It has pics and step by step instructions.

    In closing

    If you eat fries and you dont feel them inside you travel from the top of your throat to the point where they drop into your stomach,then you havent experinced bass. I miss that!
    1997 540i/6
    Glacier Green

  14. #39
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    Quote Originally Posted by Jason@BavSound View Post
    Letís Add Some Low End

    Now is the time, if you are adding multiple amplifiers, to tune your subwoofer amplifier. Remember to roughly set your low pass crossover around 90-150hz. For example, if you set your low pass crossover to 100hz, that means that all frequencies above 100hz will not be sent to that particular output channel (speaker).

    If you also amplified your interior speakers, it is important to overlap your crossover points to ensure that there no significant gaps in the frequency response of your audio system. For example, if you set your high pass crossover for your interior speakers at 110hz, you need to set your low pass filter for your subwoofer at a minimum of 110hz, but not more than 120hz to keep an overall tonal balance in your BMW.

    Again, with your gain(s) turned all the way down, begin to turn the volume of your source unit up until you reach the point where the interior speakers are distorting ever so slightly.

    Now, back down the volume until the distortion disappears and stop there. Head back to the trunk and slowly begin adjusting the gain(s) of the amplifier until you are content with the amount of bass being produced by the subwoofer without any audible distortion of the woofer. Also, make sure the clipping light on the amplifier is not illuminating. If it is, back the gain(s) down until the light ceases to flash. Now, as you adjust the volume of the head unit, the bass will adjust proportionately with the rest of your music.
    What about the bass and treeble at the head unit when checking for distortion at the interior speakers? Also, what about the bass boost at the amp while adjusting gain and checking distortion at the woofers? Should we do the gain first of the bass boost?

    I just added a mono channel amp and using the stock amp for the speakers. I have no idea what is the corss over of the stock amp is for all the original speakers, tweeters and midbass. Can I or should I modify it too? Where should i keep the corss over of the new amp for the woofers?

    Thanks
    umermariner

  15. #40
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    Quote Originally Posted by umermariner View Post
    What about the bass and treeble at the head unit when checking for distortion at the interior speakers? Also, what about the bass boost at the amp while adjusting gain and checking distortion at the woofers? Should we do the gain first of the bass boost?

    I just added a mono channel amp and using the stock amp for the speakers. I have no idea what is the corss over of the stock amp is for all the original speakers, tweeters and midbass. Can I or should I modify it too? Where should i keep the corss over of the new amp for the woofers?

    Thanks
    I added a Rockford fozgate mono amp to my stock system also with 2 600w 10" subs . And I have a Kenwood head unit with the sub output running my added sub. I'm totally lost on adjusting this??
    Also I have a stock amp and the Harmon Karmen amp what one is better?
    does one have more channels then the other? the stock show 10/35W 10 channels? the karmon shows nothing

    Brian Idaho /Cambodia

  16. #41
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    let's toss this one in the bin...

    or the first post should include the following

    1:


    2: http://www.bcae1.com/

    3: Google search DMM gain setting.

    and distortion does not kill speakers... otherwise most modern music would cause speakers to spontaneously combust.

    this thread is neither fish nor fowl... why is it even stickied?
    serves no use for experienced people and is over the heads of rookies.

    if he feels it is a great writeup he can put it on his website and/or we'll include a link in the useful links sticky to it here... it does not need to be stickied in this forum... especially as poorly written and technically inaccurate as it is.
    Last edited by attack eagle; 02-26-2009 at 03:38 PM.

  17. #42
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    fix your wiring bro to sky11

  18. #43
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    Replay

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  20. #45
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    The nasty noise created by amp clipping will fry a speaker in a second. MO' POWA' PLEASE!!

  21. #46
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    Quote Originally Posted by attack eagle View Post
    let's toss this one in the bin...

    or the first post should include the following

    1:


    2: http://www.bcae1.com/

    3: Google search DMM gain setting.

    and distortion does not kill speakers... otherwise most modern music would cause speakers to spontaneously combust.

    this thread is neither fish nor fowl... why is it even stickied?
    serves no use for experienced people and is over the heads of rookies.

    if he feels it is a great writeup he can put it on his website and/or we'll include a link in the useful links sticky to it here... it does not need to be stickied in this forum... especially as poorly written and technically inaccurate as it is.

    I again request a thread lock on this poor aborted fetus.

  22. #47
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    I have an adjustable line output converter, amp, and my sub. How do i know what to set the line output converter to?

  23. #48
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    thanks for the writeup, it really came in handy
    Last edited by racerbmw; 04-24-2012 at 01:23 PM.

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    Nice

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    Last edited by Chris93726; 06-29-2012 at 02:11 AM. Reason: Automerged Doublepost

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    AC Compressor

    According to expert, repairing just about anything on an automobile can appear a discouraging job best left to the professionals. However, with having some knowledge, a few simple tools, and a willing power to get your hands dirty, the savvy car holder can make preservation, save money. In this way, you will get knowledge and some satisfaction at working with your hands. It is really not an easy task to change AC Compressor easily, but it can make easier with some tools and previous knowledge and work experience

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