Rapco Horizon RFBLOX RF Choke XLRF-XLRM

I often need to run an audio reference signal from my mixer to the mic inputs on my camcorders so I can synchronize clips from different cameras using a common audio track. When I'm recording the audio tracks separately the camcorders don't need stereo. A common mono track functions as a time code.When my camcorders use a power supply, connecting an external signal creates hum and noise. The ISOBLOX did not help. A passive direct box (DI) used in reverse worked very well but required an attenuator and adapter cords. I'll explain below. I used the Rapco DBBLOX DI which is inexpensive and the same size as the ISOBLOX.The DI has a male XLR connector that is normally an output. I made an XLR-F to XLR-F cable to use that as in input. I also used an XLR attenuator to reduce the mixer signal by 20-30dB before it hit the DI.The DI has a 1/4 mono jack on the other end. I used a cable that converted 1/4 mono plug to miniTRS mono plug to feed the camera mic input. That cable connects the tip and ring of the stereo mini plug to the tip of the 1/4 mono plug.The transformer inside the DBBLOX rattle around just as it did on the ISOBLOX. I was able to solve that by taking off the top of the box (upper screws on each end) and placing a small piece of foam over the transformer to hold it in place.

This is the first review I have ever written for a product on Amazon, and I have been a prime member for at least 10 years now. This device was exactly for what I was looking. I am the lead broadcaster for Global Polo TV and without this device I could not do my job properly. Polo is very fluid and fast game and as such I am expected to be just as fluid and fast. I may have to do three games in the day, and having to talk that much really does take a toll on one’s voice. The only way to relieve my voice is to be able to cough every so often. Before I got this device, even if I pulled my head away from the microphone, you could still hear me cough during the broadcast. Very unprofessional. Now that I have the Coughbox it is a seamless continuation of play-by-play action from me. I can’t speak highly enough about this device! If you’re a broadcaster this should be an essential part of your equipment set up.

It worked as a volume control - seemed clean and smooth to use. I returned it because I really just wanted a quick mute, and this one (maybe it was just defective) didn't pull-to-mute as promised.

This is great when doing a live shot because if there is something you don’t want a whole group of people to hear you say when they may be watching a live feed/stream of you surfing a bunch of live hits or just nervous you may actually be live when someone didn’t tell you you are rest assured by pressing the red button the volume cuts completely out and you are muted. Would suggest for anyone in news/sports who goes live and may say something that you don’t want anyone else to hear and also don’t want to unplug and replug the mic. I would highly recommend this product. I got it used and it was completely perfect.

These boxes are good build quality and contain a transformer, which eliminates many ground loop problems. They do not appreciably alter the sound. Most "ground loop eliminators" do not have a transformer. These do. They are worth the money.

It breaks up ground loops with a 1:1 600 ohm transformer enclosed with an extruded aluminum enclosure. There appears to be no other components inside. Keep it away from AC cords and other magnetic fields as it has little shielding. The transformer rattles around inside so I take some adhesive like Goop and squirt some inside. I keep these transformers in my professional audio problem-solving kit as they are low price, pure function, and take up very little room. Sure, there are much better at 4 times the price, but these handle all but the toughest 'pin 1' problems. I would buy again and again, but keep the glue handy to tame the little rattler inside.

I use this when my Headrush Pedalboard’s direct XLR out is allowing too much interferenc. It silences that nasty noise. I don’t know how or why it works, but it does and only requires one extra XLR cable to patch it in (I use a 2 ft cable).

I've read some of the reviews and I'd like to correct a couple of them. This devise DOES in fact transmit phantom power. I've used several high-end condenser mics with this attenuator and they worked flawlessly. The only issue I've found is that turning the knob whilst a mic is attached causes static noise. After I set the volume I want, there's absolutely no background noise. So I gave it 4 stars b/c of the static, but the device is very well made: the outside encasement is metal, the XLR plugs are good quality.

This product is exactly as described, arrived quickly, and works flawlessly. Priced competitively and provides a way of defeating over zealous sound men that like to turn the vocalist down too much, Places control where it belongs, in the hands of the vocalist. I recommend this.

Perfect and very well-made