dincz Posted June 15, 2012 Share Posted June 15, 2012 (edited) Just acquired a channel strip which includes a switchable 75Hz HPF in the input section. While this is fine for taming low frequencies from a mic, I wonder how suitable it's likely to be for bass use. Modification would be easy (conventional 2 pole Butterworth and no SMD) but what would you recommend as a cutoff frequency? Edited June 15, 2012 by dincz Quote Link to comment Share on other sites More sharing options...
ikay Posted June 15, 2012 Share Posted June 15, 2012 The HPF on my Fishman Plat Pro EQ sweeps from 15Hz to 125Hz. with a 12dB/octave cut. For a fixed cutoff point I would think somewhere around 75-100Hz is probably in the ballpark so what you have will probably work pretty well for bass. Quote Link to comment Share on other sites More sharing options...
LukeFRC Posted June 15, 2012 Share Posted June 15, 2012 the 'standard' bass Eq point on a lot of the standard bass on board preamps is around 40Hz. Glockenklang 30Hz and 100Hz on a Warwick. Quote Link to comment Share on other sites More sharing options...
bremen Posted June 15, 2012 Share Posted June 15, 2012 [quote name='ikay' timestamp='1339768404' post='1694050'] The HPF on my Fishman Plat Pro EQ sweeps from 15Hz to 125Hz. with a 12dB/octave cut. For a fixed cutoff point I would think somewhere around 75-100Hz is probably in the ballpark so what you have will probably work pretty well for bass. [/quote] No way! Cut below 75-100Hz and there won't be any fundamentals left in the bottom octave. 40Hz maybe. Quote Link to comment Share on other sites More sharing options...
Ian Savage Posted June 15, 2012 Share Posted June 15, 2012 [quote name='ikay' timestamp='1339768404' post='1694050'] The HPF on my Fishman Plat Pro EQ sweeps from 15Hz to 125Hz. with a 12dB/octave cut. For a fixed cutoff point I would think somewhere around 75-100Hz is probably in the ballpark so what you have will probably work pretty well for bass. [/quote] I'd dispute that - low E's about 40Hz IIRC and the G's around 100Hz, you'd be cutting almost all of the bass frequencies before you even start! I reckon a -3dB point at about 40Hz would do a decent job of keeping 'rumble' and noise out, but I'm not sure how much of that you'd get Quote Link to comment Share on other sites More sharing options...
dincz Posted June 15, 2012 Author Share Posted June 15, 2012 My Compact is 10dB down at 42Hz which should almost kill the fundamental of the bottom E (without any EQ) but in practice it's absolutely fine. Just how important is the fundamental anyway? Quote Link to comment Share on other sites More sharing options...
ikay Posted June 15, 2012 Share Posted June 15, 2012 (edited) [quote name='bremen' timestamp='1339768962' post='1694059'] No way! Cut below 75-100Hz and there won't be any fundamentals left in the bottom octave. 40Hz maybe. [/quote] OK perhaps that's a little high but the range ion the Fishman HPF is 15-125Hz. As a comparison the range of the variable HPF on a Euphonic iAmp is given as 20-80Hz at 6dB/octave so maybe somewhere around 40-50Hz is closer to the mark. Rollling off a little bass can often have a much more beneficial affect on amplified bass sound than many people realise. In the end though it's down to what you're trying to achieve and what sounds right to you. Edited June 15, 2012 by ikay Quote Link to comment Share on other sites More sharing options...
heminder Posted June 15, 2012 Share Posted June 15, 2012 modding be easy, but it depends on the board. in the general case you'd only need to change one capacitor, but if it's surface mount then it'll be a bit awkward to work on. Quote Link to comment Share on other sites More sharing options...
dincz Posted June 15, 2012 Author Share Posted June 15, 2012 [quote name='heminder' timestamp='1339780891' post='1694348'] modding be easy, but it depends on the board. in the general case you'd only need to change one capacitor, but if it's surface mount then it'll be a bit awkward to work on. [/quote] Modding is not the problem (see OP) Quote Link to comment Share on other sites More sharing options...
paul_5 Posted June 15, 2012 Share Posted June 15, 2012 Nothig wrong with cutting at 40 or even 100Hz - if it's for studio use then what you've got is an instant 'sort out the clash between the kick drum and the bass guitar' button (alright, there's more to it than that, but hopefully you'll see what I'm driving at). Quote Link to comment Share on other sites More sharing options...
Lozz196 Posted June 15, 2012 Share Posted June 15, 2012 (edited) I`ve just bought an SFX Micro-Thumpinator, which cuts off at 30hz. Looking forward to using it, but not got a rehearsal for another month Edited June 15, 2012 by Lozz196 Quote Link to comment Share on other sites More sharing options...
BB2000 Posted June 15, 2012 Share Posted June 15, 2012 75Hz is fine, there is very little fundamental in a bass guitar signal - your open E will sound just fine. Quote Link to comment Share on other sites More sharing options...
Lozz196 Posted June 15, 2012 Share Posted June 15, 2012 A fair few of Ashdowns speaker cabs have the loest frequency handling stated as either 60 or 70hz, so it`s not as if there will be no bass at all. And Ashdown aren`t exactly reknown for their tinny sounds. Quote Link to comment Share on other sites More sharing options...
BigRedX Posted June 16, 2012 Share Posted June 16, 2012 Try it and use your ears. Do you like the sound or not? Quote Link to comment Share on other sites More sharing options...
dincz Posted June 16, 2012 Author Share Posted June 16, 2012 (edited) [quote name='BigRedX' timestamp='1339837798' post='1695067'] Try it and use your ears. Do you like the sound or not? [/quote] Sounds great in my living room but wondering about live situations - which I'm not likely to be in for a while. In any case, I'm curious and a tinkerer. Edited June 16, 2012 by dincz Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted June 16, 2012 Share Posted June 16, 2012 If thats starting to roll off at 75hz, prob be OK, depends how steep to an extent. The SVT 8x10 is rolling off from about there, but relatively gently. Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted June 16, 2012 Share Posted June 16, 2012 Oh yeah, and if live, have it after your DI to front of house, since that sort of lows isn't that useful for monitoring anyway, and let sound engineer deal with rest. You'll find you can crank your rig crazily with no farting. Quote Link to comment Share on other sites More sharing options...
Lfalex v1.1 Posted June 16, 2012 Share Posted June 16, 2012 Fwiw, the two set-points for the hpf on my QSC power amp are 50Hz and 30Hz. 50hz works fine through a cab, even with a 5 string. If you're using it into a PA, you may want to go lower than 75Hz. Just my 2p Quote Link to comment Share on other sites More sharing options...
dincz Posted June 16, 2012 Author Share Posted June 16, 2012 [quote name='Mr. Foxen' timestamp='1339843934' post='1695234'] If thats starting to roll off at 75hz, prob be OK, depends how steep to an extent. The SVT 8x10 is rolling off from about there, but relatively gently. [/quote] It's -3dB at 75Hz and a 12dB/octave slope. Quote Link to comment Share on other sites More sharing options...
dincz Posted June 20, 2012 Author Share Posted June 20, 2012 I have it straight from the horse's mouth (or Alex Claber's to be precise) that 40Hz would work well with the Compact. Quote Link to comment Share on other sites More sharing options...
Ian Savage Posted June 21, 2012 Share Posted June 21, 2012 [quote name='dincz' timestamp='1340218653' post='1701337'] I have it straight from the horse's mouth (or Alex Claber's to be precise) that 40Hz would work well with the Compact. [/quote] *smug face* Quote Link to comment Share on other sites More sharing options...
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