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Old 22nd February 2013, 02:45 AM   #1
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Default 45hz bass boost on amp sounds gummed up?

it's not distorted but it sounds a bit muddy when I have 6 or 12 dB bass boost on my amp.
the bass sounds too muddy for 45hz but when I use the EQ on my computer it sounds great and clear.
tried many different speakers. from 12 inch subwoofers down to crappy 16 ohm 2 x 4 inch tv speakers rated for probably less than 5 watts.
all speakers have muddy bass at 45hz bass boost.
any idea as to why?
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Old 22nd February 2013, 02:50 AM   #2
Enzo is offline Enzo  United States
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Do you know that to double the output power of an amp is to raise the level 3db? And the reverse, if you ask a 3db increase from the amp, it has to double the power at that freq to do so. every 3db is to double the power again. SO a 12db increase or boost would be like asking your power amp to double double double double the power output. Your amp is not limitless, so it just runs out of room to produce a clean waveform.


If your speakers cannot produce 45Hz, boosting the 45Hz in the signal won;t make the speakers do it.


I suspect you are overdriving your signal path.
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Old 22nd February 2013, 02:56 AM   #3
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This is becuase the crispness that you are used to hearing in bass instruments are actually higher in frequency.

They are harmonics that are higher than say the 45hz that you hear.
Typically in the 150hz to 400hz range and higher depending on the instruments timber or character of its sound.

jer
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Old 23rd February 2013, 01:52 PM   #4
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that makes sense
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Old 24th February 2013, 10:02 PM   #5
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Location: Adelaide South Oz
Take a look at the "tight" switch on a Hughes an Kettner TriAmp (Clean/Crunch Channels).

http://www.webphix.com/schematic%20h.../hk_triamp.pdf

The filter circuit on page E of the schematic is inserted into the cathode of the input stage (in place of a cathode bypass cap). It rolls off the sub 100Hz response very agressively to ggive a "TIGHT" response.

Cheers,
Ian
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Old 24th February 2013, 10:56 PM   #6
JMFahey is offline JMFahey  Argentina
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Many Amps famous for their good sound have switches which actually *CUT* Bass .
I'm talking Ampeg/Gallien Krueger/Sunn here.
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Old 24th February 2013, 11:20 PM   #7
tinitus is online now tinitus  Europe
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Quote:
Originally Posted by realflow100 View Post
....... muddy bass at 45hz bass boost.
any idea as to why?
difficult to say, especially without knowing how the boost is done

I have ongoing experiments with my 3way bass guitar speaker

my new DIY preamp was a huge improvent in every way

after that I did very small adjustment to the mid/tweeter xo
this actually resulted in greatly improved bass response from my 15" woofer
even more funny that the woofer have its own amp, and no xo of any kind

I also have a midbass horn
when I connect that, everything changes again

its just to say, its never simple at all
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