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Rolls DU30B Mic Preamp Audio Ducker
From the Manufacturer
Rolls Mic Preamp Audio Ducker (DU30B)
Ronny LECLERC
Reviewed in Canada on February 16, 2025
J'adore
Mindy D.
Reviewed in the United States on January 22, 2025
Easy setup and worked like I wanted it to.
RH
Reviewed in the United States on May 30, 2022
This is more of a "automatically interrupt the music when someone talks on the mic" type device. It's not for subtly lowering the volume on the background music while there is talking and then ramping it back up when the mic talking stops. This has a hard, fast ramp up and down (e.g. fast release and attack), and the knob for release time "fast/slow" only affects the delay before the ducking is disabled. It does not affect the fade back in of the audio as I had hoped.So this won't sound like your sound guy or DJ is dropping the volume of the music when the mic is active; it's a much harsher effect which doesn't work for my use.
tim hunter
Reviewed in the United Kingdom on December 1, 2022
Thus product came with an American plug so I had to buy an adapter…… dissapointing …. The ducker itself works well needs a bit of fine tuning …
simpletechdirect
Reviewed in the United States on July 29, 2013
Well, it does just what its intended to do. You can also, link them together and make a "make shift" priority switcher. Its solid and works fine. Only issue I had with one was the release time wasnt long enough. Its an easy mod though. I put a video on youtube you can watch if you need to do that. I was trying to use it to trigger the output of a mixing console over the house music with live bands. The house music would come blaring though every time the band stopped playing between songs. Its just one small capacitor to change. Great stuff other than that.
J. Layton
Reviewed in the United States on November 1, 2011
I was hired to provide music for a community skateboard/basketball-shoot-out event. It was outdoors and required two sound systems, each with different music play lists. In addition, each sound system had wireless microphones for the announcers. Rather than man both sound systems in order to turn down the music whenever someone spoke into the mic, I bought two duckers. A ducker fades out the music when someone speaks into the microphone and turns it back up when they stop talking. DJs use duckers. I mainly run live music events so these little boxes were something I never needed until the organizer asked for the feature. I was going to try to use my compressors as duckers but these looked easier and were made for the job.I sent my laptop (music) into the tucker. You'll need an audio cable that terminates with RCA jacks, which connects to the ducker. Your mic will connect to the ducker via XLR cable. These two signals are combined in the ducker and fed out as a single RCA cable. THIS cable will go into your sound board.To use, you will set your sound board level so it is somewhere reasonable to start the adjustment process. No clipping! Next, you set the music level via laptop..so you can hear it through the PA system. Then set the the mic level on the ducker. Speak into the mic and adjust the signal level on the ducker. You have to balance the levels out between the vocal mic and the music input. The overall PA volume is controlled by the mixer. Once you have the music and vocal signals sounding the way you want it..adjust the ducking level and sensitivity. The duck level sets how LOW the ducker turns down the music-a little bit or way down. The sensitivity adjustment regulates how sensitive the ducker is. In other words you don't won't the ducker to turn down the music every time the mic picks up background noise, crowd noise, etc. You want the ducker to work ONLY when someone speaks directly into the mic. I had to turn the sensitivity down because the ducker was responding to the music I was playing. I decreased the sensitivity so it only ducked when someone spoke right into the microphone. This little box also lets you adjust how quickly the music level comes back up once the person stops speaking. Total control.It helped to have an assistant speak into the mic, with the music playing, while I made the adjustments back at the PA system. You could do it yourself by trial and error. Speak into mic, make adjustment, try again, tweak, and so on.Overall this is an easy to use device that made my life easier and the customer very happy.
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