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Bigwan

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Posts posted by Bigwan

    High Pass Filters

    in Effects

    Posted

    Just now, dood said:

    Has anyone tested the HPF on the MS? - (If I still had mine I would do that right now, but ... I don't anymore.)

    Just through headphones via a little behringer desk so not really transferable to this case Dan...

    High Pass Filters

    in Effects

    Posted

    17 minutes ago, Al Krow said:

    Interesting - please expand? Having been inspired by you to go for a mini board (even though it seems you have now abandoned this worthy venture!) and consequently now having limited space on my board, I was actually thinking of ditching my dedicated MXR compressor for a HPF / LPF pedal to take its place and making do with the Zoom MS-60B compressor effect sim.

    But if you're using the MS-60B why add an extra HPF? It has one on board anyway...

    High Pass Filters

    in Effects

    Posted · Edited by Bigwan

    1 hour ago, Al Krow said:

    Which Zoom pedals have this Fishman preamp effect on, do you know? Definitely seems to be absent on both my MS-60B's 142 effects and B3n's 67 effects. In its absence, I guess I'll be making do with the GEQ on the B3n (this only has the ineffective single band para noted above) or the dual para (assuming it is more effective than the B3n's single para) or GEQ on the MS-60B.

    MS60B has the AC BS PRE according to the effect list on their website. If the effects blocks in the effect list are the same as on the pedal it should be between "bass pre" and "SVT".

    High Pass Filters

    in Effects

    Posted · Edited by Bigwan

    17 minutes ago, PaulWarning said:

    there's not that many Hi pass filters about from what I can see, the thumpinator looks like it's non adjustable which is would put me off, that leaves the Boughton model, which looks like you have to send off to the USA for, just wondering why they're so hard to come by

    Just a hole nobody has really filled. There's also an Australian built passive HPF that is 6dB/oct and TINY, but can't recall what it's called right now... EDIT: It's called the Tight A*se...

    If there's interest I could build a little run of the Vong filter when it's released. If I had more free time I'd put together a competitor for the Thumpinator myself. It's eye-wateringly expensive for what is essentially (and I'm just taking a wild guess without counting the pennies) £8 - £10 of parts...

    I might give this a bit of thought... I can think of 4 useful pedalboard tools of varying complexities along the same lines...

    High Pass Filters

    in Effects

    Posted · Edited by Bigwan

    15 minutes ago, BigRedX said:

    Thanks for the info. Nearly all of my working experience with filters been variable designs in synthesisers, so I wasn't aware that by removing the variable aspect it would be easier to reduce the cut off frequency hump.

    A lot of hardware cabinet simulators take advantage of the filter overshoot (the electronic term is ringing - it's a characteristic of the Q, or quality factor of the filter). The OmniCabSim is a prime example of a collection of filters designed specifically to be non-ideal.

    High Pass Filters

    in Effects

    Posted · Edited by Bigwan

    31 minutes ago, BigRedX said:

    Also as has already been said many filter designs will as a by-product of the way they work add a slight peak to the signal at the cut off point - which is something you really want to avoid on one aimed at removing sub-audible frequencies. AFAIK only the Thumpinator is designed specifically to minimise this peak.

    This effect is mostly down to design compromises made to allow the filter to be variable. The filter is, as a result, not ideal. The Thumpinator isn't specifically designed to minimise this peak, per se, but the filter doesn't have to be compromised in the same way. The filter design used in the thumpinator has been around for donkey's years, it's a standard electronic building block (see any active analogue filter design textbook for a 4th order Sallen Key filter).

    Floppy strings

    in Accessories and Misc

    Posted

    What strings do you use now? Go up a gauge and see if it helps. I went from Elite 40-100 to 50-110 when we tuned down a tone and the bass needed minimal adjustment so tension must have been pretty close. As Dood suggests use the D'Addario string tension calculator, it'll get you in the ballpark.

    High Pass Filters

    in Effects

    Posted

    16 minutes ago, pete.young said:

    On the Zoom bass pedals, the AC BS Pre is a clone of the Fishman Platinum Pro. The 'Depth' control is a HPF at 12dB/oct - not as steep as the Thumpinator but might achieve some of the desired effect.

    Thanks Bigwan, great minds think alike :-)

     

    Indeed!

    Chaining 2 of these together will have the same effect (in theory) as a 24dB/octave roll off. That's how these filters typically work, 2 identical 12 dB/oct filters in series.

    High Pass Filters

    in Effects

    Posted

    For the DIYers among us, Julian Pohler (Mr. Shalltechnik04 - the guy behind the Guma Drive, Guma Antique and Growling Krizzly kits) is bringing out a combined HPF/LPF + DI kit soon called "Vong" (no idea what Vong means). I've asked him to keep me posted on when it's to be released.

    • Thanks 4

    The Yamaha BB mega-thread

    in Bass Guitars

    Posted

    6 minutes ago, dannybuoy said:

    Do some reading on passive EQ stacks Al! There are tons of amps with the same setup. Hartke LH500 and Fender Bassman for a start, I think the Mesa 400 pairs a passive cut-only mid EQ along with a more modern cut/boost bass/treble as well. There's no 'neutering' involved, it's just that the bass/treble is boost only and the mid is cut only - so you aren't boosting the mids at all with the knob up full.

    I'm sure one of your band plays oldies... the Orange Terror is the best thing I've tried for classic RnB/Motown/Funk with a passive bass plugged straight in. Just a slight bit of valve drive, no pedals needed, more heft than you can shake a stick at. Go on, buy one and see!

    All true...

    Ashdown LB212 cab

    in Amps and Cabs

    Posted

    Ashdown didn't help their cause by writing a rating of 100w on some of these - mine was 100w, 4 ohm,  but they are 300w. They're a nice cab. WAY heavier than advertised, but great vintage tones out of them. 20 was the number I had heard. If it starts to sound like it's struggling then turn it down. 

    DIY Effects

    in Effects

    Posted

    12 hours ago, OzMike said:

    What digital pot are you using, out of curiosity? Last time I looked at this kind of thing in any detail a few years ago the reality of integrating digital pots with existing analog effects was not pretty for a few reasons, and referring to the actual I was using:
    https://www.mouser.com/ds/2/609/AD5241_5242-586728.pdf
    1) tolerance - 30% - probably ok for one-off DIY projects, but not so good for predictable results
    2) current handling = low
    3) voltage range; max voltage is well below the 9V of standard effects pedals
    ... the end result being you probably can't just snip out an analog pot and replace it without a digital one without analysing how the circuit works and making sure the max current and max voltage isn't exceeded.

    Would love to see someone get a hardy and reliable solution going in this area, though!

    AD5144ABRUZ100 I think it is (phone autopredicted that so assume it's right!). I hadn't given the current handling much thought to be honest, but for the initial project I think the 5 odd volt limit should be fine - it definitely won't work for every pedal for that very reason. I got lucky in that the Guma Antique I plan on grafting this to uses 4 100k pots, 2 lin, 1log, 1 inverse log. These chips are +/- 20% tolerance, again I'm going from memory as it's been a few weeks since I selected them and haven't looked at anything other than the i2c section of the dataset and the pinout since, but if they are that's same as the ubiquitous 16mm Alpha pot that seems to be used in most every analogue pedal nowadays. 

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