Shure A15AS Switchable Attenuator (15, 20, 25 dB), Passes Phantom Power

If you bought a cheap interface and you need to mic a drum kit, this is a cheap option to attinuate the input signel to prevent clipping.If you plan to use a condenser microphone, this inline attunuator allows power to pass through.

Aknowledging that the result of you vocal recording will be the sum of all elements in the chain:Performer -> microphone -> Preamp -> coloration and modulation Effects.This high pass filter is one element that will play in your favor, when achieving the perfect vocal take.Live scenario:Reduction of plossives and low end rumble/ambient noise. while using any dynamic microphone of your preference.Recording Studio scenario:By cutting the low end (below 100hz) you might hit higher gains on your preamp without clipping (improving S/N Ratios), also with less low end content your compressors will react better to the vocals . Finally, if you are recording to a DAW, you will make more efficient use of your available bit depth, by cutting that useless low end (on vocals) from the beginning.

Last November I had unexpected RF interference right in the middle of church service. I have been doing sound / video in this church for several years, and this is the first time this issue cropped up. Turns out there was a crew clearing land not too far away, and apparently they have hot-rodded their CB sets. There were only two mics which were sensitive to the RFI, out of seven total I have in use during service. After installing these RFI filters, and not hearing anything for weeks I thought ahah, problem solved. Well last Sunday, it’s back, however bleed thru of the interference is greatly reduced due to the filters to a level that is unnoticeable while someone is speaking at mics, but just audible when mic channel is open, but no input from speaking, for example. So, just Mute the channel. Short story, these in fact do attenuate RFI, not eliminate it. At least the RFI is not anywhere near the objectionable level it was previously. Just a side note, for two cents worth, the mics that are very sensitive to the RFI are Samson (CM-20?) gooseneck mics. I have since ordered a couple of Shure CVG-18B gooseneck mics, they claim internal shielding for RFI, so we shall see!

This is the best in line mic pad. minus 15, 20 or 25 db with a positive switch

Our church had some RF interference/signal pickup in boom-style choir microphones. Sometimes, you can get away with filtering closer to the mixer or somewhere discreet along the signal path, but I needed to place these in between the microphone and cable for best results. The RF vanished completely in that position. The condenser mics look extra long with these attached, but nobody really notices.

This Shure model is well built and does the job… however, -40 db is too much for my line-to-mic application. I was hooking a dbx 286s mic processor line out into the mic in of my Arrakis mixing console. -30 db is just about exactly right. I had to order another brand for that. I kept this one though, just in case I have a need for it. I would have paid the extra for the Shure brand, but they didn’t have a -30 db on AmazonAdditional… I found a small input adjust on the console I am using this device with, adjusted that slightly, and the 40db down is now about right.

I had a problem with RF feedback to the microphone from the transmitter at my ham radio station on the 10 m band (28 MHz to 30 MHz). Ferrite beads did not help. I installed this isolator at the input of the inline mic preamp. The feedback went away. I think that the JFETs at the preamplifier input were rectifying the RF. Of course, I should find out how the RF is getting into the mic cable in the first place.This device is a common mode choke for the audio pair--not the sheild. It reduces the tendency for common mode RF to become normal mode when the impedance to ground is unbalanced. It may not help in all circumstances. It may be necessary to install one at each end of the cable. It passes phantom power. It won't affect the frequency response or introduce distortion..

Great for API 512c preamp that doesn’t have an output control. I stick mine on the output to converter and now can use DI boxes better. On my API512C I noticed just because it hits red doesn’t mean clipping! This is the go to for API 512c preamps! I just set it at the lowest option and was good enough to turn up and hit no louder than -12 to -6 or so. I wasn’t able to turn my API up more than 9 o’clock before this. Now I can go noon or more for the mojo of that preamp.