Question 1

I need to reduce signal level from a 2-ch preamp to a 2-ch power amp.  How tight a tolerance do these attenuators maintain?

Accepted Answer

You will need two of these...one for left and one for right. The tolerance on Shure equipment is tight and professional in tolerances stated. These will work well places between a preamp output and an amplifier line/aux  input. When an input is overdriven with too much signal it will distort at any and all volumes...these units allow the preamp to not overdrive the input stage of the power amplifier so that the power amp starts with a distortion free input signal that it can amplify to the speakers.

Question 2

Can I use this for echo feed back on microphone

Accepted Answer

the short answer is "no"

ummm....   It MIGHT help a little tiny bit, but even if it does help, most humans would not be able to tell. That's not what it's meant for. It's meant specifically to diminish frequencies below 100Hz. Feedback is ALMOST never caused by frequencies below 80hz. In fact, I would actually argue that most feedback is caused exclusively by vocals pushing their own individual signal (or the overall master/bus) over the threshold that allows the mic to "hear itself through the speakers". That means frequencies in the 180ish hertz to 5,000ish hertz(and quite often even higher).    Feedback control is more about dynamics and overall volume(particularly on stage), mostly because not many sound engineers or performers care to tune the PA or the room/venue to suppress the resonant frequencies that turn into feedback.

Having your main speakers in line with the band/performers/entertainment is also not the most advantageous thing to do for the same reason; the culprit resonant frequencies will start accumulating shortly after your PA is set up. The microphone hears a signal then sends it out through the speakers, which then get picked up through the microphone again, and then back out through speakers.

If you have feedback problems, this device MIGHT clean up your overall sound a bit, but will not eliminate feedback. If you want to rid yourself of feedback you should consider; tuning the room/venue with sound absorption, moving your mics closer to their source, having a quiet stage(in ear monitors), or spend lots of money on real nice and smooth main PA speakers and spend decent amounts of time on their placement in that room/venue.  Hope that helps.

Question 3

do i need 2 of these if hooking up to h4n? if not, won't it only record 1 sided?

Accepted Answer

Short answer would be yes you would need two of these for a full stereo BUT you could use just one of these and then a y cable to feed the or source the one mono signal to both stereo channels so then if you really did not need stereo then one of these and a y cable will yield two channels with same mono audio on each of the two channels and that may be completely acceptable audio as it will sound fine but not be true stereo but will be audio on both channels...Gordon

Question 4

Will this attenuator cut a line level signal from a consumer device (like a Roku player...-10dB?) to be used as mic level input on a pro mixer?

Accepted Answer

I believe it'll solve your problem.  I am using it to feed the line level input from a Shure wireless mic receiver (line out) to the mic inputs on a Zoom recorder.  The line-to-mic feed I've described works like a charm with this adapter.  I have a pair of them.
Best regards,  Bill

ASIN	B0002J1JKY
Antenna Location	Karaoke, Singing
Audible Noise	25 db
Audio Sensitivity	25 db
Best Sellers Rank	#9,818 in Musical Instruments ( See Top 100 in Musical Instruments ) #3 in Radio Frequency Attenuators #1,261 in Microphone Accessories
Brand	Shure
Built-In Media	microphone
Color	#N/A
Compatible Devices	Microphones, Audio Mixers, Audio Recorders
Connectivity Technology	XLR
Connector Type	3.5 mm Jack
Customer Reviews	4.8 4.8 out of 5 stars (250)
Enclosure Material	Stainless Steel
Global Trade Identification Number	00042406054010
Hardware Platform	Karaoke Machine
Impedance	150 ohm
Item Dimensions	7.9 x 5.5 x 1 inches
Item Type Name	Instrument Condenser Microphone
Item Weight	3.2 ounces
Manufacturer	Shure
Mfr Part Number	A15AS
Microphone Form Factor	Overhead
Model Name	A15AS
Model Number	A15AS
Number of Channels	1
Number of Items	1
Number of Packs	1
Power Source	Corded Electric
Signal-to-Noise Ratio	25 db
Special Feature	Use this balanced-line attenuator to prevent low-impedance microphones (rated at 150 or 600 ohms) and high-output condenser microphones from overloading low impedance inputs in high sound pressure level applications. The values of attenuation can be switch selected for 15, 20, or 25 dB. Use the A15AS with any low-impedance microphone, including phantom-powered condenser microphones, such as the Sh…
UPC	042406054010
Unit Count	1 Count
Warranty Description	2-year limited warranty.

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

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