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Old 11-29-2007   #26 (permalink)
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yea bass boost is an absolute killer, but if im bored somtimes i amplify the signal streanth and crank the bass boost and run for the fire extinquiser, makes for a good time
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Old 01-31-2008   #27 (permalink)
 
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I know im extremely late but does anyone have a link or that vid? Its not working anymore..
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Old 01-31-2008   #28 (permalink)
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Lemme see if I can find it.
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Old 02-05-2008   #29 (permalink)
 
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I take it u didnt find it? lol. Thanks anyways bro..
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Old 04-26-2008   #30 (permalink)
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this post saved me, after readin this i went outside and discovered the a**holes that installed my system had both my P.A. 3000db amps with the Bass Boost turned to the maximum, i immediately turned them both off....much better
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Old 05-09-2008   #31 (permalink)
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You will know when your subwoofer start to clip and distort. If you have good hearing and know what clipping and distortion sound like that your ear will know.
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Old 11-01-2009   #32 (permalink)
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Default Re: Bass Boost & Clipping

I found this ( The Clipping effect test - 05-20-2005, 12:31 PM
--------------------------------------------------------------------------------
Clipping Test Results
________________________________________
Well, Talnlanky and I have finished the test and compiled the results. Our goal with this whole experiment was to get rid of a few possible erroneous preconceptions, learn a little and share the results with all the other readers. We attempted to be as objective as possible with our testing to be sure and give everyone accurate information. We had access to a great supply of accurate test equipment and plenty of samples to work with. I cannot guarantee these results 100% and that they will be the same for everyone, but I believe they are an accurate portrayal of the effects of a clipped signal played into a dynamic loudspeaker.

The basis of this test was to see how the effects of a clipped signal would affect driver failure. Failure in this test was thermal breakdown of the driver's voice coil. Thermal breakdown in the test was when the driver's voice coil either shorted out or opened up due to materials melting down. We scaled a few test drivers with Power until we found out how much it would take to have thermal failure within 1 minute.

The test consisted of 16 drivers, 8 small drivers to be tested at 1 KHz and 8 larger drivers to be tested at 170Hz. The two different frequencies were chosen to see if cone movement played a major role in cooling effectiveness.

Two different signals were used in the test, a pure sine wave that measured less than .1 THD at the amplifiers output and a pure square wave that measured at least 34% THD at the amplifiers output.

Two different kinds of power were used during the test, normalized power between the square and sine (differing voltage drive) and non-normalized power between the square and sine (same voltage drive). We did this for two reasons, one; the normalized voltage would represent an amplifier driven into hard clipping, and that is what most people are concerned about. Two; normalized power was used to indicate the difference a square or sine would have on the loudspeakers voice coil at the same power level (like clipping your deck for instance, but still having the output of your amplifier at a relatively low level).

We used two drivers for each set of measurements and gave both results plus an average to help give accurate results. We also matched the pairs used in the test by their voice coil Le measured on a Suncor meter. Of the 16 drivers used, only three gave what appeared to be erroneous results, not to shabby! Power measurements were made using a small signal through line power meter to ensure the square and sine waves were matched relatively well, and then the power increased linearly with the sine to be used as a reference. We were within 10% with our power matching, which is still pretty decent. It is very difficult to measure square wave power into a reactive load. You cannot use an average meter as you are dealing with peak currents in a full duty cycle signal with a crest factor of 1.

The results-

It was very surprising to see how much power these drivers actually handled! The 4" drivers were rated at 5wrms and the 5" drivers at 25wrms. Both drivers took much more than that to be driven to failure as the attachments will show.

Normalized voltage (AKA amp at full clipping). This shouldn't have been much of a surprise to anyone knowing that a square wave with the same Pk-Pk voltage as a sine will have almost double the power. As you can see on the spreadsheet and graphs, power handling severely dropped when the square wave was applied in this test. Time to failure was cut by a factor of 4 for most drivers.

Normalized power was a little more interesting. We could not prove within the scope of our test that a different signals of normalized power would have any different effects on the driver, regardless of the amount of cone excursion. Some people may still argue this, but it seemed pretty clear to us that weather a square or sine was put into a driver at a normalized power level, it still failed about evenly.

An extra test.... Remember when some people say "It doesn't even matter if it is only a few watts, if it's pure distortion, it will ruin your woofers".... Well we took a 10 watt square wave and ran it into a Pioneer 10" subwoofer for a few hours.... Nothing happened to it, of course, the motor didn't even get hot....

This test also only dealt with lower frequency drivers (in the big scheme of things) and is in no way meant to represent tweeters or any other driver that requires a filter network to provide a safe operating environment. That is a whole other ball of wax.

We hope that everyone gets something positive out of this and we had a great time doing the test!

I would like to thank the following people for all their help and knowledge, I know I forgot a few, but here we go anyway-

Talnlanky- Did the whole test, took the pictures and compiled all the data for you guys to see
Victor Tiscareno- Smartest dude I know
Sergey- Helped us realized how tough this would be!
Dan Wiggins- "its real easy Mike, if you have a resistive load....."
Hugh Dean- Designs awesome amps and gave some great pointers
Black00- Always gives us great ideas when destruction is involved
Parts Express- For having 49 cent drivers.....

-Mike Edgar


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Old 03-28-2010   #33 (permalink)
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Default Re: Bass Boost & Clipping

That was a great video.thx.i never fully understood clipping just knew not to turn up the gain and bass boost to high.
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Old 04-11-2010   #34 (permalink)
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Default Re: Bass Boost & Clipping

very good info now i need to find some one with if those devices
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Old 04-24-2010   #35 (permalink)
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Default Re: Bass Boost & Clipping

why do they put bass boost on amps then ?
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Old 04-24-2010   #36 (permalink)
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Default Re: Bass Boost & Clipping

To sell amps.
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Old 04-27-2010   #37 (permalink)
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is it really
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Old 05-24-2010   #38 (permalink)
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Default Re: Bass Boost & Clipping

I have a memphis pr500 at 1ohm and with the bass knob off it doesent hit at all running 2 m3 4ohm dvc 10's at 1ohm, turn up the knob then BOOM the amp comes alive, is that normal?
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Old 05-27-2010   #39 (permalink)
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Default Re: Bass Boost & Clipping

this saved me. lol. i though my subs were done! until i watched that vid. i just turned down the boost and its good again. thanks
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Old 06-16-2010   #40 (permalink)
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Default Re: Bass Boost & Clipping

this video like saved me from buying another amp. i thoughtmy amp was done till i turned down the bass boost and the gain
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Old 06-17-2010   #41 (permalink)
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Default Re: Bass Boost & Clipping

Quote:
Originally Posted by BlackMag View Post
this post saved me, after readin this i went outside and discovered the a**holes that installed my system had both my P.A. 3000db amps with the Bass Boost turned to the maximum, i immediately turned them both off....much better
yeah thats what happend to me. ive had clipping twise and once i almost bought new subs and the second time almost bought new amp. lol. the jerk who tuned my amp said that he was "profesional"
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Old 06-17-2010   #42 (permalink)
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Default Re: Bass Boost & Clipping

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Originally Posted by johnecon2001 View Post
To sell amps.

nothing but the truth, considering most vehicles peak in that general area anyway..
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Old 06-20-2010   #43 (permalink)
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Default Re: Bass Boost & Clipping

sooo does the remote bass knob cause clipping also??
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Old 06-27-2010   #44 (permalink)
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Originally Posted by ~ROB~313 View Post
sooo does the remote bass knob cause clipping also??
yes...a bass knob is nothing but like having a long ass screwdriver to turn the boost up. it ovverrides the knob. so u turn ur bass knob all the way its the same as turning the amp up all the way.
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Old 06-29-2010   #45 (permalink)
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Originally Posted by iversonbaby View Post
yes...a bass knob is nothing but like having a long ass screwdriver to turn the boost up. it ovverrides the knob. so u turn ur bass knob all the way its the same as turning the amp up all the way.

yeah i took my boss knob out too
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Old 12-16-2010   #46 (permalink)
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Default Re: Bass Boost & Clipping

I need to learn how to use an o scope
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Old 01-25-2011   #47 (permalink)
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NOT FOUND says the link
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Old 03-15-2011   #48 (permalink)
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Default Re: Bass Boost & Clipping

hello. i have a soundstream DTR1.1700D i was wondering what i should set the settings to for a RE MT15 1 ohm coils? i am shooting to give it 2500w 1250rms could someone help me out? thanks much.
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Old 03-15-2011   #49 (permalink)
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Old 03-16-2011   #50 (permalink)
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Default Re: Bass Boost & Clipping

so 60v on the gain? should i just not mess with the bass boost? where should i put my frequency? if there are posts to this already it would be much appreciated for the links..
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