Hi
Me again!
I’ve got settings on my amp
On the front
semi parametric EQ
LEVEL -15 to +15
Frequency 40 - 10k
Switch on/off (when I turn it on: the levels go up)
I don’t have a manual
Can anyone interpret this?
im Assuming it’s helpful to my sound and if that’s so, I’d like to make use of it.
Google didn’t help.
Just got to look a little:
www.manualslib.com
"Semi-Parametric Equalizer – Allows you to dial in a specific frequency to enhance or cut. This feature is especially useful for upright and acoustic bass guitars that have a resonant frequency. Because we've included a bypass switch, you can also use it to create a second tone that is available instantaneously. (You're welcome.) The frequency is adjustable from 40Hz to 10KHz. The level can be adjusted +/- 15 dB. The control is FLAT when the level control is at 12:00 position (straight up). ON/OFF Indicator"
Stuart,
David (Eden) Nordschow, the writer of your amp manual and I go way back to the 1970s, we collaborated on some PA designs, he later found the Bass Guitar amp market to be a good place for leveraging all that "sound information" into profitability.
You should read the whole manual, but here is a little more "propellerhead" stuff than David put in the manual:
Frequencies are measured in cycles per second, abbreviated Hz, named after Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
In terms of notes- the low E on a bass guitar is about 40 Hz (41.2 to be exact), an octave up would be the low E on a 6 string guitar, double that frequency, 80 Hz. Each octave higher is a doubling of the fundamental frequency.
Each note consists of the fundamental frequency, and harmonics that are multiples of the fundamental frequency- the low E second harmonic is 80 Hz, third 120 Hz, fourth, 160, etc.
On most basses, the output of the harmonics are actually louder than the fundamental, but the spacing of the harmonics will always be that of the fundamental frequency- for that reason you can still detect "bass notes" even through a speaker that has little bass response.
Our hearing works on a logarithmic scale, the audio industry adopted the deci- Bell (dB) after Alexander Graham Bell's work in the invention of the telephone. At 1000 Hz, a change in level of 10dB sounds about twice or half as loud. However, in terms of power, 3dB is a doubling of power, 10dB is ten times the power- your amp/speakers can probably hit around 100 dB SPL (sound pressure level) at one watt, to sound twice as loud (110 dB) requires 10 watts, then another 10 dB (120dB) 100 watts, another 3 dB is 200 watts (123 dB) another 3dB uses 400 watts (126dB) and now your amp, and ears, are about out of headroom..
Art