JTS pre-amp x-over points

Some of that spec looks made up. e.g. the frequencies of the graphic ( only 7 bands) looks closer to an elvins unit

was very tempted to bid on that Elvin's pre.Deciced last minute not to.

a reply to same thread on bloodandfire..

"those frequencies are probably the -3 dB points of the crossover filters, which is the common way to specify the cut-off frequency of a filter. Obviously, when you design the crossover filters for a multiband preamp, you want the frequency response to be flat when all filters are active. Since any analog filter does not cut off instantly but with a certain slope, the responses of neighboring filters will overlap within a certain frequency range. You want to design the shapes of the filter frequency responses such that in these overlapping regions, the total response of both filters sums to 0 dB. When neighboring filters would have their -3 dB points at the same frequency (so with no "gap"), the total response would actually be + 3 dB at that frequency. Instead, what you want is that at the cut-off (-3 dB) frequency of one filter, the response of the other is at -10 dB, so that the sum is 0 dB. So the numbers that are given in the description make perfect sense and there is no "gap" in the response."

mskeete do you do the same??

novice wrote: a reply to same thread on bloodandfire.. "those frequencies are probably the -3 dB points of the crossover filters, which is the common way to specify the cut-off frequency of a filter. Obviously, when you design the crossover filters for a multiband preamp, you want the frequency response to be flat when all filters are active. Since any analog filter does not cut off instantly but with a certain slope, the responses of neighboring filters will overlap within a certain frequency range. You want to design the shapes of the filter frequency responses such that in these overlapping regions, the total response of both filters sums to 0 dB. When neighboring filters would have their -3 dB points at the same frequency (so with no "gap"), the total response would actually be + 3 dB at that frequency. Instead, what you want is that at the cut-off (-3 dB) frequency of one filter, the response of the other is at -10 dB, so that the sum is 0 dB. So the numbers that are given in the description make perfect sense and there is no "gap" in the response." mskeete do you do the same??

Hell no
That just doesn't sound right to me.
My points are specified 'properly' and sum to 0db

 

u take a listen to tubbys and every1 dat uses tubbys pre amp all soundthesame there is really no definition in his sound check his bass the notes he plays ars the same on every tune and also his 30hz on his pre amp is lazy and u cant often even hear it. Shame on tubbys. but i must give him respect for his mids high and treble it is very clean and his mic to.

mark wrote: u take a listen to tubbys and every1 dat uses tubbys pre amp all soundthesame there is really no definition in his sound check his bass the notes he plays ars the same on every tune and also his 30hz on his pre amp is lazy and u cant often even hear it. Shame on tubbys. but i must give him respect for his mids high and treble it is very clean and his mic to.