Gear / Technical Help > Ask The Tapers
New Taper here !
jerryfreak:
--- Quote from: Gutbucket on September 17, 2020, 06:09:54 PM ---BSM-7 has a specified dynamic range of 95dB @ 1kHz, and a max input level of 105dB SPL @ 1kHz, before distortion exceeds 1%. But 105-95= 10dB, not 32dB as figured by the SNR spec above, so what gives? I think that has to do with the 1% distortion constraint. The microphone can accept higher SPLs before eventually clipping, but only with increasing levels of distortion Doing the math the other way, a 32dB A-weighted noise floor and a 95dB dynamic range suggests outright clipping at an SPL of 127dB, which is reasonable for that type of microphone.
--- End quote ---
sadly, statement of this spec is not standardized. some manufacturers like schoeps list max spl at 0.5%. others like DPA use 1%
worth noting that, as peaks go, 1% distortion on transients is probably still not very audible
wforwumbo:
Greetings, Schr! Welcome to this weird little world. I myself come from a studio background - glad to know I’m not alone ‘round these parts anymore. We should nerd out about compressors sometime in another thread that won’t derail the topic at hand,
To add to what’s been said so far re: your old noisy preamp... how old is it, and when’s the last time it was serviced? You might need a few recaps, especially in the power section. I’ve got an eventide rack harmonizer here that is emitting a weird whiny hum, and my debugging is pointing to the filter caps needing replacement.
Those CM3s you have should be okay even if doing field recording. I don’t think their self noise is high enough to be evident even in high dynamic range scenarios, I wouldn’t think they’re the problem.
On the whole though, welcome. Ask lots of questions, take everything with a grain of salt (especially if it comes from me, and especially if it’s me telling you to take things with a grain of salt), and enjoy what this wonderful community has to offer.
DSatz:
schr, since I can't send you these PDFs via private message (to my knowledge), here they are for you to download. One is the sales brochure for the Sound Devices MixPre from when it was still identical to the Shure FP24, down to the coax connector used for powering the preamp. The other is the owner's manual from a little later; by that time SD had changed over to a 4-pin Hirose power connector, but as far as I'm aware, that was the only substantive revision in the product.
--best regards
Schr:
--- Quote from: wforwumbo on September 22, 2020, 12:04:30 PM ---Greetings, Schr! Welcome to this weird little world. I myself come from a studio background - glad to know I’m not alone ‘round these parts anymore. We should nerd out about compressors sometime in another thread that won’t derail the topic at hand,
To add to what’s been said so far re: your old noisy preamp... how old is it, and when’s the last time it was serviced? You might need a few recaps, especially in the power section. I’ve got an eventide rack harmonizer here that is emitting a weird whiny hum, and my debugging is pointing to the filter caps needing replacement.
Those CM3s you have should be okay even if doing field recording. I don’t think their self noise is high enough to be evident even in high dynamic range scenarios, I wouldn’t think they’re the problem.
On the whole though, welcome. Ask lots of questions, take everything with a grain of salt (especially if it comes from me, and especially if it’s me telling you to take things with a grain of salt), and enjoy what this wonderful community has to offer.
--- End quote ---
Thanks! Much appreciated! I’ll have to be honest in that I’ve been focusing so hard at the job at hand for the past 5 years, I’ve really moved away from all my music production technical knowledge, so I wouldn’t have much nerdy stuff to say! Also hence why I’ve joined this forum, trying to soak up some of this technical knowledge!
I was mistaken and I just have a 9v battery thing, not a preamp (shows what I know, heh!). I’ve solely used it for my stereo bsm-7s and I note that it sounds noisier than it used to. Something to address in the future me thinks.
For now I’ve got DSatz Shure FP24 on the way and I’m looking forward to doing some mono FX recording with that, my CM3 and either m10 or Tascam DR100mk2
Thanks for your help everyone !!
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