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Mottlefeeder

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Everything posted by Mottlefeeder

  1. Mottlefeeder
    There are speaker grill manufacturers who will produce a grill to your dimensions - eg www.speakergrills.co.uk Before going down that road, you need to consider how you are going to fix it to the cab, whether you want a flat grill, or one with folded over edges etc. I would also recommend having it coated before despatch. You will waste a lot of paint spraying through the holes if you do it yourself. The alternative, if it exists, is the aftermarket you refer to, which may be more expensive because each product is intended to fit an expensive branded cab. David
  2. Mottlefeeder
    I had a s/h Warwick Corvette fretless tuned BEAD, which I loved, and decided to move on to a 5-string fretless Corvette. What I didn't realise was that the transition from 4-string bubinga body to a wider neck 5-string and lighter swamp ash body would result in neck dive. I tried various remedies and eventually decided I would never be happy with it so I moved it on.
  3. Mottlefeeder
    It may depend on whether the amp module is stand-alone, or on the same pcb as everything else. When I fried my Ashdown MyBass, I did some basic tests for them and they then sent me a new module and asked for the old one back. That suggests some component level of repairability is feasible. David
  4. Mottlefeeder
    I have a Tascam GT-R1 recorder/bass trainer with stereo mics built in, but found it overloaded at performance sound levels. Conversely, a cheap Tandy electret mic feeding into a budget mixer worked fine at the same volumes. YMMV as they say. David
  5. Mottlefeeder
    Things like the Phil Jones Briefcase are available second hand, using mains or a 2.2kg 12v lead acid battery, so they are a one hand carry, but not that light. I hear that the next generation used a lithium power pack which is lighter. but much more expensive. David
  6. Mottlefeeder
    A box that includes different size holes for the battery terminals would tick the boxed for me - no chance of inserting a battery rhe wrong way round and damaging the circuit. David
  7. Mottlefeeder
    That one was two shielded balanced pair cables with a common figure-8 sheath - presumably someone still makes it. David
  8. Mottlefeeder
    As a compromise, Studiospares did a figure-8 stereo microphone cable - two balanced cables joined together. Haven't found it yet on the G4M site... David
  9. Mottlefeeder
    The BL provides a Yamaha mixer/amp and PA speakers, but we often busk using event-supplied generators. I carry a mixer which can be battery powered, and a battery powered rig so we can continue with my mixer & amp & his speakers if the power fails (typically the generator runs out of fuel). David
  10. Mottlefeeder
    I've been using stereo microphone cable to do this for several years - it works well for active basses with electronics to drive the signal through the cable, but passive basses may have some loss of high frequency contect due to the cable capacitance. David
  11. Mottlefeeder
    Interesting history of tuning here. https://jakubmarian.com/the-432-hz-vs-440-hz-conspiracy-theory/ David
  12. Mottlefeeder
    Behringer xenyx 304 - EQ on bass/line in, and also on the stereo line in/PC out. This makes it really easy to minimise the bass on the track you are learning, regardless of whether it comes from an external MP3 player or from the PC. David
  13. Mottlefeeder
    I think the issue with people practicing is that you might play through the same phrase many times, and that is what winds people up. David
  14. Mottlefeeder
    OK - your back-up head (Elf or similar?) will probably have a jack socket output so you would need a jack plug to speakon to connect to the extension speaker and a speakon to jack socket to connect that to the combo cab. That would also give you the option of connecting the combo amp to the extension speaker if the combo speaker was suspect. David
  15. Mottlefeeder
    Yes. Been there, done that - I once managed to connect my main amplifier output to my back-up amplifier, and only one survived. Your option of making your back-up amp have the same connection as the combo amp is the safest option to prevent two amps being connected at the same time. David
  16. Mottlefeeder
    I built a kit which used 'Overlord of Music' hardware. It was fine for EADG, but useless for BEAD tuning as the string clamp bends the string through 90 degrees, and the B string would not take that. I ended up making an in-line clamp to get round the problem David
  17. Mottlefeeder
    I'm trying to squeeze as much bass out of a small cab as I can, and the constraints I have accepted are that I need the steeper filter to reduce the port velocities. So my filter does not need to be variable, which makes things easier. With regard to digital options, the last digital circuit I designed was the logic behind a discharge-then-charge battery charger. I think it had eight gates in it. Also, learning new languages has never been easy for me, so I'm pretty much 100% anogue. I'll check out LTspice and see how steep the learning curve will be. David
  18. Mottlefeeder
    It's funny how when you only have a hammer, every problem starts to look like a nail! Thanks for the info - I'll check it out. (And thanks for correcting my typo which I only noticed last night) David
  19. Mottlefeeder
    Feeding WinISD'a filter calculator with the cookbook recommended Q per section for a two-section filter, I get two 12dB filters to give the same response as a 24dB filter. Unfortunately I cannot model the Rod Elliott twin 18dB filter design as WinISD only allows a triple 12dB design. But that gives me a design that I can work with. David
  20. Mottlefeeder
    My understanding is that the Q defines the sharpness of the knee, and that also affects the likelihood of ripple. The Butterworth 'design' maximises the range of the flat response, and the WinISD Butterworth graphs show no ripple. Chapter 16 of the op-amp cookbook @tauzero linked to does show graphs for various filter configurations. David
  21. Mottlefeeder
    Thanks @tauzero - towards the end of chapter 16 there is a comment that to achieve an overall Butterworth response in a multi-section filter, each section should have a different Q. That implies that the copy-and-paste sections in the FDeck and Elliott designs are approximations, and the WinISD calculated responses are correct. I'll have a play in Win ISD and see if I can get a two section filter to produce the same response as their composite one. @nekomatic - as far as I can tell, the Q defines the sharpness of the corner, and is not related to the slope of the curve further downhill, so for example with a high Q, low order filter, you could have a high peak at the corner followed by a relatively gentle slope. David
  22. Mottlefeeder
    The busking band are out pretty much every weekend, doing 5 hour gigs in all weathers, sometimes on both Saturdays and Sundays. That makes our annual total about 70-75 gigs. Pre-Covid we were out almost every Saturday and Sunday and doing sheltered accommodation gigs some afternoons and some parties in the evenings. We peaked at 180 gigs in one year just before Covid, and that included nine gigs in seven days in the run up to Christmas. A few years ago I told the BL I would be cutting down to three gigs a week, and this year I am doing one 5 hour gig most weekends. I no longer have the stamina to do two 5 hour gigs on successive days. David
  23. Mottlefeeder
    I'm confused! Rod Elliott's 36dB rumble filter uses two cascaded 18dB sections and he says it has a combined Q of 0.707, making it Butterworth. FDeck's 3rd generation 24dB HPF uses two 12dB sections and global feedback to sharpen the corner and make it Butterworth when both the variable and fixed frequency sections are tuned the same. However, WinISD gives you different responses for two cascaded 12dB Butterworth HPF filters compared with one 24dB Butterworth HPF filter. My question - Does cascading two HPF filters, each with a Q of 0.707, give you an HPF filter with a Q of 0.707, or is the Q related to the sharpness of the knee, so a steeper filter will have a higher Q? David
  24. Mottlefeeder
    Loose Change Buskers routinely play one 5 hour set once or twice most weekends. The back line is there for the duration. The two 'front line' singer/guitarists alternate songs and play for either one or two hours, swapping in fresh singers one at a time and as slickly as possible. David
  25. Mottlefeeder
    When I checked with Warwick whether I could convert my jan1 from EADG to BEAD I was told I could, and sent a replacement screw for the one string position that was not compatible with its new string diameter. That's the sort of thing they are for. David
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