Alto Professional Expansion Pack for Stealth Wireless MKII - Single Channel UHF Wireless Receiver for Active Speakers,black

I have a Shure wireless microphone system that feeds into a Yamaha audio mixer and from there it goes into a laptop computer for broadcast on the web. The mic receiver, audio mixer and laptop are in the back of the conference room and I am unable to run a long audio cable from the mixer to the speakers located in the front of the room, as the cable would need to pass through a high foot traffic area. The Alto MKII-UHF wireless audio system solved my problem by allowing me to wirelessly transmit the audio signal from the mixer in the back to the powered speakers in the front of the room. The audio is crisp and clear and I have not observed any audio delay. No batteries are required as the Alto receiver and the two transmitters all come with power supplies. Highly recommended.

I've been using this for several months now with no problems at all. Sound quality is good. No dropouts. Very easy to set up. We're moving our mixer to a sound booth in the back of the church. Without this system, we would have had to run cables thru the ceiling to the stage. Well worth the price to save us all that work.

I was very excited about receiving this wireless system. As soon as it arrived, I unpacked it, read the instruction manual and set everything up.I let the receivers scan for available channels and synced the transmitter up accordingly. Then I powered up my speakers and to my unpleasant surprise immediately I heard a very noticable mix of hiss and rumble.Tried the different squelch settings to no effect. Unplugged the receivers and instead hooked up my xlr cables, to make sure nothing was wrong with my speakers, unlikely for QSC speakers, but wanted to make sure it's not a defect from my side. Connected to the xlr cables the hiss/rumble disappeared. So I reconnected the stealth mkII receivers again to try searching for another channel. Now it took them over a minute to search and when they found and set themselves to supposedly free channels my speakers almost blew out my eardrums because all that came through was an extremely loud interference noise.Luckily I turned the speakers off before they could be damaged.Syncing up the transmitter to the channels didn't help. Now it just added the occasional burst of interference noise.I also tried to only use one receiver to make sure they were not interfering with each other, even though they both ran on different channels and properly set to left and right.The transmitter was also a mere 6 feet away with direct line of sight, so no obstruction nor too far of a distance of any kind.Knowing how frequencies can interfere with each other on live events, especially when other DJs or musicians set up their wireless equipment in neighboring rooms, I can absolutely not rely on these. Imagining a bride, a celebrant or just anyone standing next to a speaker when it's silent or playing background music, then interference happens and shoots out this ear piercing interference pattern into a person's ears, I'd lose credibility, potentially damage my speakers, because I won't be standing right next to them, to turn them off right away, potentially a lawsuit for bodily injury in form of hearing damage(mine are still ringing as I write this review) and definitely lose recommendations for potential new clients.I so wish the stealth system had worked but if it already gives me these problems at home, in a semi rural area, it'll definitely give me more problems in crowded places. I cannot take that risk and sadly will have to return them back to Amazon.

Exceed expectations

I already have an Alto pro transmitter. It has very good range and All the major components are reliably made with metal. This is a consumer grade product that is mostly cheap plastic. The only reason why I purchased this is because the professional version is no longer available. I thought that it might be close enough. Unfortunately after seeing what good is this is quite disappointing.The main disappointment is the range. It's about half as much as the professional one is. And when obstacles move in front of it say people walking around it will often lose its signal. For this to work properly you really need to have line of sight between all components with no risk of anything blocking the signal including people walking around. I would happily buy the professional version again if they offered it but I won't buy this one again.

Works great! Highly recommended for professional use by wedding a d event DJs like myself.

Don’t have to run 100’+ cables. Sounds great inside, haven’t tried it outside yet.

Best audio transmitter I've ever used.Only gripe is that if you want a truly wireless setup you'll need a lithium power bank with more than one amp of power. My wireless pa speakers had a USB port I could use temporarily with an up converter from 5v to 12v... But the USB port would likely eventually burn out so I'm sourcing miniature power banks for these. Zero cables