OSD Audio 300W in Wall Volume Control Impedance Matching for Home Speakers, Rotary Knob White SVC300

Works as promised. Easy to install. Appears to be of utmost quality.

I researched many different volume control knobs offered on Amazon and decided to give this one a go! The installation was a breeze! You will need a box extender as these units are quite deep but they’re easy to find on Amazon! When it comes to the knob itself it is very well built, there’s no pausing in the audio when adjusting the level (as others have mentioned) and you won’t be disappointed! Note: The instructions could have been a little clearer when setting the impedance matching toggle... also, I didn’t see this mentioned anywhere but the higher you set the toggle example 1/2x -> 4x -> 8x you’ll notice a drop in the volume output from your speakers however that is to be expected! Overall, I was very happy with this control knob! Like the title says I ended up purchasing another one! The second one was a little temperamental at first but that was due to some wiring that needed to be replaced and due to a more powerful amplifier! I replaced some wires and reduced the volume on the amplifier and now all is awesome with this one too!

The speaker volume control works exactly as promised. The screw terminals for attaching input and output wires increased the ease and flexibility of installation. The unit fits in a typical single gang box. I used the slider volume control in an external box to control outdoor patio speakers. The controller came with four face plates of different colors which are more than similar products from other sources.

I decided to replace my previous knob volume control (based on impedance matching) after one of the amplifier's channel of my Onkyo Receiver didn't work anymore, and I suspect that the culprit was the inductive coupling. So I decide to replace it by this resistive type, and this one, works perfect. One of the features I like is that has full volume at one end (direct connection, no resistors), meanwhile on the other end, the last step is disconnected (fully isolation of speakers), for great control. It comes with three different colors of covers and knobs to match your taste. It was easy to install, replacement was straightforward. Inputs/outputs on the device are well labeled and the screw connectors make it fast work, connectors also can be detached from the knob control, for easier cable hookup. Product seems of excellent quality. Overall, Recommended. Review made by Handyman

Works great for RV exterior speakers. No more in and out to adjust volume.