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

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.

Work as intended. Greatly improved my sound quality for streaming. The audio sent to me was way too HOT! This greatly reduced audio levels that was perfect for streaming!

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.

This was designed as a mic level device only. However, I tried it in a pinch to reduce wind (fan) noise picked up by a tiny condenser mic during a video shoot. The A15HP blocks phantom power, so I had to inserted into the line level feed that came out of the mixer. (Ouch.) The mics were all picking up normal speech frequencies - no deep bass other than the wind - so the tiny inductors in this HP filter were not overloaded noticeably, and the feed was cleaned up dramatically. As a bonus, it tightened the bottom of some SM-58 style cardioid dynamic mics that were being worked too close.For reference, the level into this Shure filter averaged around 1V RMS (way too high), but the load impedance was good - 50K (an FMR RNC1773 used to step on the camera feed.) This device performs beyond the call of duty when loaded very lightly, and that saved the situation. Would I normally recommend an A15HP for this application? Nope. Did it work amazingly well? Yup. Get one for your ENG / recording studio toolbox.

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.

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!

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.

Very good item, totally solved the RFI problem i had of my radio signal getting into my mic cable. I’m ordering a second one for the output of my channel strip to insure there’s a clean signal going into the radio….bottom line, it worked for me!