mshilarious
Banned
Why would an electret have necessarily higher noise than an externally polarized capsule? It's really down to capsule size, isn't it? And is that capsule actually 1/4"? Looks like it could fit up to 12mm, at least, in there.
MichaelJoly
Banned
The self noise in a typical electret condenser is higher than an externally polarized condenser because of the lower diaphragm polarization voltage available from the back-electret ("permanently" polarized design) vs. a true, externally polarized diaphragm which usually operates with a voltage doubler off the 48v phantom supply. And the internal FET is also a noise floor limiting aspect of the electret design - typically 62 dB S/N A weighted (which really means "Dynamic Range") - so if one allows for 20dB of headroom for peaks we're really talking about a small diaphragm mic with about a 40dB S/N - which is what I hear when I use these things.
Yes, the CM127 size is deceiving - but there is a standard 1/4" electret capsule mounted in a big ole rubber grommet in there.
Yes, the CM127 size is deceiving - but there is a standard 1/4" electret capsule mounted in a big ole rubber grommet in there.
mshilarious
Banned
I don't really see that borne out in practice; for example, KSM141 vs. MK012, Schoeps MK3 vs. DPA4006. Anyway, higher polarization voltages aren't exactly a free lunch.
I also don't see why you'd subtract 20dB from 94dBSPL for a "headroom" SNR measurement when almost any mic is going to have 30dB+ headroom above that nominal level. Were that the case, no one could use any microphone to record drum overheads. Dynamic range is max SPL less self-noise; SNR is 94dBSPL less self-noise.
FET noise is also a limiting factor of externally polarized designs.
But yeah, I would avoid a 6mm cardioid capsule of any polarization type, at least for general use. They work OK on drums.
I also don't see why you'd subtract 20dB from 94dBSPL for a "headroom" SNR measurement when almost any mic is going to have 30dB+ headroom above that nominal level. Were that the case, no one could use any microphone to record drum overheads. Dynamic range is max SPL less self-noise; SNR is 94dBSPL less self-noise.
FET noise is also a limiting factor of externally polarized designs.
But yeah, I would avoid a 6mm cardioid capsule of any polarization type, at least for general use. They work OK on drums.
MichaelJoly
Banned
I'm confused by your introduction of 94dbSPL. I was talking about the Panasonic WM-61A et al type electret condenser capsule. These are spec'd at 62db S/N. In the case of that particular capsule, Panasonic really means the absolute max peak voltage to RMS noise floor is 62dB - more commonly called the "Dynamic Range" specification.
When I was working for David Blackmer at dbx we routinely allowed for 20-22dB of "peak factor" above maximum RMS program levels. So I subtracted 20 dB from Panasonic's published "S/N" spec of 62 to get a real world S/N of 42 dB. Which is what the typical back electret sounds like.
Bottom line? Back electret condenser mics are noisier that externally polarized mics.
When I was working for David Blackmer at dbx we routinely allowed for 20-22dB of "peak factor" above maximum RMS program levels. So I subtracted 20 dB from Panasonic's published "S/N" spec of 62 to get a real world S/N of 42 dB. Which is what the typical back electret sounds like.
Bottom line? Back electret condenser mics are noisier that externally polarized mics.
mshilarious
Banned
No they don't. Although if you use Pana's test circuit, that might be correct, as it distorts easily. Anyway, if you actually measure self-noise you don't get a figure anything near 52dBA. That's preposterous. Although I don't know if Pana's 62dB SNR is A-weighted; I suspect their figures might be unweighted. They do state clearly that SNR is based on 0dB=1Pa, thus, 94dBSPL.
I would suggest that your figures on WM61A are wildly inaccurate; I would affirm Pana's 62dB SNR as a likely, perhaps slightly conservative, unweighted figure, and maximum potential dynamic range of an unmodified capsule as about 94dB unweighted.
Interesting you say that Blackmer added a 20dB fudge factor, because Earthworks doesn't seem to have a problem claiming 22dBA for their 6mm electrets.
Not of similar capsule size; you seem to have ignored the examples I cited earlier. The KSM141 is quieter than the MK012.
antichef
pornk rock
Sigh. That rings true from what I see in other places with regard to other stuff - the internet and long distance shopping/shipping have pretty much taken the fun out of traveling when it comes to getting cool stuff. Even getting interesting souvenirs is not really doable.
I'm in Singapore today and headed to Shanghai tomorrow. There's one thing I'm getting a lot of that I don't get back home, and that's jet lag
Good noodles, too.
J
John_7408
Member
seems the 797Audio CR8288 is a copy of Russian octava mic, I was told that 797audio was ever the OEM supplier of Octava-UK MK012...
M
moresound
Loud Sun Studios
Hey it's the Ningbo factory guy again. Howdy John.
M
moresound
Loud Sun Studios
Hey where did he go?
M
moresound
Loud Sun Studios
Must of been some Chinese spamming going on.
Couldn't make out but one or two words anyway and Google translator wasn't working well on that site.
The pink hello kitty microphone looked cool at least.
How many Renminbies to a dollar?
Couldn't make out but one or two words anyway and Google translator wasn't working well on that site.
The pink hello kitty microphone looked cool at least.
How many Renminbies to a dollar?
S
stevieb
Just another guy, really.
Am I missing something here??? You want to go to China- the home of ALL the world's counterfeit microphones- and buy microphones that will have NO warranty, NO support, NO documentation worth the paper it is printed on- microphones that aren't even "legit" enough to even LOOK like real microphones? Aren't you just BEGGING to be ripped off???
L
lxmic
New member
Hey it's the Ningbo factory guy again. Howdy John.
Hello, nice to see you .
yesterday, the webmaster said I put the Spam on this website ,so they close my ID.
I just tell friends how to buy microphones and Electret condenser microphone When they in China. So pity.
But no problems, jaja...
If you have any problems about China products or you want to China tell me,maybe I can give you any suggestions.
John
M
moresound
Loud Sun Studios
Thanks John..... it's always good to hear from someone on the other side of the globe.
This site does have a strict no spamming policy and it is sometimes hard to get the new ideas and innovations of new products. You just can't refer back to your company.
Are there any new revolutionary audio products that will shake the world coming out of China soon? like the new wireless line 6 modular microphones?
This site does have a strict no spamming policy and it is sometimes hard to get the new ideas and innovations of new products. You just can't refer back to your company.
Are there any new revolutionary audio products that will shake the world coming out of China soon? like the new wireless line 6 modular microphones?
L
lxmic
New member
give you some specs of Digital Wireless Audio Module
2.4G DIGITAL WIRELESS HEADPHONE MODULE
Product Readme
RF 2.4G Digital Wireless audio transceiver module, have got CE/FCC approved, with high sampling ratio at 64K, high capability of anti-resistance, apply for wide applications in developing 2.4G Digital Wireless Transceiver, 2.4G HI-FI Wireless Headphone, 2.4G Digital Wireless Tour Guide, 2.4G Wireless Microphone, 2.4G Wireless Speakers, 2.4G Wireless Interpretation System and so on.
Features
Digital audio with 64K sampling rate and 16-bit resolution.
Low power consumption.
GFSK digital modulation/demodulation.
20Hz ~ 20 KHz audio frequency response.
90dB audio dynamic range.
Power-on function to prevent pop noise.
Avoiding reception errors by employing forward error correction (FEC).
Operating at 2.4GHz ISM band with 20 selectable channels.
-85dBm receiving sensitivity, 45dB channel rejection and Application distance up to 130 meters (L. O. S. ) with perfect reception.
Applications
Car Audio /Car Speaker
Home theater rear speakers
Wireless speakers
Sound Card, MP3, CD player and DVD player
Headphone
Ordinary sound box
Thanks John..... it's always good to hear from someone on the other side of the globe.
This site does have a strict no spamming policy and it is sometimes hard to get the new ideas and innovations of new products. You just can't refer back to your company.
Are there any new revolutionary audio products that will shake the world coming out of China soon? like the new wireless line 6 modular microphones?
2.4G DIGITAL WIRELESS HEADPHONE MODULE
Product Readme
RF 2.4G Digital Wireless audio transceiver module, have got CE/FCC approved, with high sampling ratio at 64K, high capability of anti-resistance, apply for wide applications in developing 2.4G Digital Wireless Transceiver, 2.4G HI-FI Wireless Headphone, 2.4G Digital Wireless Tour Guide, 2.4G Wireless Microphone, 2.4G Wireless Speakers, 2.4G Wireless Interpretation System and so on.
Features
Digital audio with 64K sampling rate and 16-bit resolution.
Low power consumption.
GFSK digital modulation/demodulation.
20Hz ~ 20 KHz audio frequency response.
90dB audio dynamic range.
Power-on function to prevent pop noise.
Avoiding reception errors by employing forward error correction (FEC).
Operating at 2.4GHz ISM band with 20 selectable channels.
-85dBm receiving sensitivity, 45dB channel rejection and Application distance up to 130 meters (L. O. S. ) with perfect reception.
Applications
Car Audio /Car Speaker
Home theater rear speakers
Wireless speakers
Sound Card, MP3, CD player and DVD player
Headphone
Ordinary sound box
L
lxmic
New member
Thanks John..... it's always good to hear from someone on the other side of the globe.
This site does have a strict no spamming policy and it is sometimes hard to get the new ideas and innovations of new products. You just can't refer back to your company.
Are there any new revolutionary audio products that will shake the world coming out of China soon? like the new wireless line 6 modular microphones?
2.4G Hi-Fi Wireless Speaker Module
Product Readme
Features
* Digital audio with 64K sampling rate and 16-bit resolution.
* Low power consumption.
* GFSK digital modulation/demodulation.
* 20Hz ~ 20 KHz audio frequency response.
* 90dB audio dynamic range.
* Power-on function to prevent pop noise.
* Avoiding reception errors by employing forward error correction (FEC).
* Operating at 2.4GHz ISM band with 20 selectable channels.
* -85dBm receiving sensitivity, 45dB channel rejection and Application distance up to 180 meters (L. O. S. ) with perfect reception.
Applications
* Car Audio /Car Speaker
* Home theater rear speakers
* Wireless speakers
* Sound Card, MP3, CD player and DVD player
* Headphone
* Ordinary sound box
L
lxmic
New member
Thanks John..... it's always good to hear from someone on the other side of the globe.
This site does have a strict no spamming policy and it is sometimes hard to get the new ideas and innovations of new products. You just can't refer back to your company.
Are there any new revolutionary audio products that will shake the world coming out of China soon? like the new wireless line 6 modular microphones?
2.4G Digital Wireless Microphone Module
Features
Digital audio with 64K sampling rate and 16-bit resolution.
Low power consumption.
GFSK digital modulation/demodulation.
20Hz ~ 20 KHz audio frequency response.
90dB audio dynamic range.
Power-on function to prevent pop noise.
Avoiding reception errors by employing forward error correction (FEC).
Operating at 2.4GHz ISM band with 20 selectable channels.
-85dBm receiving sensitivity, 45dB channel rejection and application distance up to 130 meters (L. O. S. ) with perfect reception.
