hpc364 Posted Tuesday at 01:28 Posted Tuesday at 01:28 Hi ! I play on a Rumble 115 (100 W) first generation, it's fine for bass but for double bass it's another story. I read a preamp is sometimes needed (my piezo is a Shadow 950) because of an impedance problème. So what should I do ? A preamp or something like that ? Or keeping playing with the volume at 30 % or more and dealing with the EQ ? Quote
tinyd Posted Tuesday at 11:00 Posted Tuesday at 11:00 Might be worth trying an "fdeck" which a lot of people use to help with the impedance etc. I have one of these https://www.facebook.com/photo/?fbid=988199496641126&set=pb.100063532544681.-2207520000&locale=en_GB 1 Quote
petebassist Posted Tuesday at 12:26 Posted Tuesday at 12:26 I use a K&K Sound Pure Preamp, which clips on my belt so I can tone shape & adjust the volume without having to go to the amp or rely on the sound person. I've heard about this impedance issue but I've no idea what it is 🙃 1 1 Quote
tinyd Posted Tuesday at 12:41 Posted Tuesday at 12:41 Yep, the FDeck is an HPF that does a good job of removing the "boom" but also boosts the level if needed. I haven't been using mine much for gigs but for some reason at my last gig the bass sounded bad even though it was in the same venue, with the same amp and with what I believe are the same amp settings. 1 Quote
TheRev Posted Tuesday at 12:43 Posted Tuesday at 12:43 Bob Gollihur's site has a good explanation of why impedance matters and why you may need an impedance matching preamp for your piezo pickup https://gollihurmusic.com/ohms-impedance-from-the-input-perspective/?srsltid=AfmBOoqHLBKvd9-BHmshssKiCIrAT5-J3dtKmh8iyoYJAZfJ0RjsUZO7 If your Shadow 950 sounds nasal and thin through your Rumble 115, then you probably need a preamp with a high (5-10 MOhm) input impedance to match the high impedance of the pickup. The simplest preamps, like the K&K pure preamp will buffer the impedance difference between the pickup and the amp input but offer no EQ, phase inversion or high pass filter (HPF). If you can afford it, I would recommend a preamp with a HPF control as that will help defeat feedback on loud or boomy stages. Again, Bob Gollihur's site has a good range of preamps available, but it's a USA site, so it's worth seeing waht's available from a european dealer https://gollihurmusic.com/preamplifiers-and-eq/1-channel-preamplifiers/ 2 1 Quote
hpc364 Posted Tuesday at 16:20 Author Posted Tuesday at 16:20 Will this one work well ? https://www.kksound.com/pure-preamp Quote
hpc364 Posted Tuesday at 18:55 Author Posted Tuesday at 18:55 Hum, maybe I'm thinking about this one, I also play jazz guitar... So maybe... https://www.fishman.com/portfolio/platinum-pro-eq-di-analog-preamp/#support Quote
TheRev Posted Tuesday at 20:17 Posted Tuesday at 20:17 I use the Fishman and am very happy with it. I also see a lot of folk musicians using them for guitar, mandolin, violin, etc. There's also an input trim control and a boost switch, wich is very useful if you swap between instruments. 1 Quote
hpc364 Posted Tuesday at 20:31 Author Posted Tuesday at 20:31 12 minutes ago, TheRev said: I use the Fishman and am very happy with it. I also see a lot of folk musicians using them for guitar, mandolin, violin, etc. There's also an input trim control and a boost switch, wich is very useful if you swap between instruments. Cool ! I ordered it an hour ago. For few minutes I have thought I made a mistake. Quote
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