Echo Link Amps in Control4: it isn't the driver, it's that there's no audio path

Where this came from: this question was asked on r/Control4 by u/jvport — not here. We answered it there, in public, and this is the fuller version. It is a good example of a problem that looks like a missing driver and is actually two separate failures stacked on top of each other.

The short version

The Echo Link Amps are not passive. They are powered amplifiers with their own DAC and volume stage. What looks like one problem — "it shows up but no music plays" — is two: Control4 has nothing to talk to, and there is probably no audio physically reaching the amps. Neither one is fixed by a driver.

The question

Someone was adding four Amazon Echo Link Amps for multi-room music on a Control4 system running OS 4.2 with two CORE 1 controllers and two Neeo remotes. There is no specific driver, so they tried generic ones. The amps appeared in the system but no music played through them. Their own guess was that the amps being passive meant no signal was being registered — reasonable, and not quite right.

The rest of the music group is two Sony STR-AZ3000ES receivers. The test source was the Amazon Music app added to Control4.

Our answer

Failure one: there is nothing for Control4 to control

The Link Amp is driven by Alexa. As far as we know Amazon never published an IP or serial control interface for it, which means there is no protocol for a driver to speak. That is why a generic amp driver binds happily and gives you a nice icon and does nothing — the commands go out and land nowhere.

Worth doing your own search on driverCentral before taking our word for it, but we have never seen a Link Amp driver from Chowmain or anyone else, and we would not expect one to be possible without a published control interface.

Failure two, and this is the one that explains the silence: no audio path

This is the part that matters most and it is the part people skip.

In Composer, selecting a source in a room only produces sound if that room's audio endpoint is bound — in the Connections tab — to something that physically carries the signal to that amplifier. Control4 will happily show a source as selected in a room and route exactly zero audio, because as far as it is concerned it did its job.

The original poster confirmed the diagnosis himself in a follow-up: no sources were connected to the Link Amps at all. So even with a perfect driver, there was no signal to play. Open the Connections tab on the generic driver and look at what its audio input is tied to. If it is tied to nothing, that is your answer, and no driver is going to fix it.

The real problem is architectural

Echo Link Amps are designed to pull their own stream from Alexa over the network. They are not a Control4 endpoint. They are a parallel music system that happens to live in the same house.

You can force it to sort-of work: feed a fixed analog or optical output from a matrix into each amp's input, set the Link Amp volume once, never touch it again, and do all level control upstream. But then you have four amplifiers nobody can turn down from a keypad, and a second app in the house for the family to be confused by. We would not build that for a client.

What we would actually do

Pull them and put in four Sonos Amps or Triad Ones.

• Sonos Amp is what we would pick for a retrofit like this. The driver is official, the streaming is native, and the client gets transport and volume on the touchscreen and the keypad without anybody building anything custom.
• Triad One is the cleaner answer if you want everything inside Control4's own streaming and do not care about the Sonos app.

The two Sony AZ3000ES receivers are fine and stay exactly where they are — that is a real driver over IP and it works.

We should flag our own hedges: the specifics above about what the Link Amp does and does not expose, and about current availability of the Triad One, are from our experience and our recollection rather than from a spec sheet open in front of us. The architectural point — that these are an Alexa endpoint and not a Control4 one — is the part we are confident about.

What others said on the thread

Summarised in our words. These are other people's claims on a public forum, not ours, and we have not verified them.

• u/remeolb asked the right diagnostic questions before offering any answer — what is the audio source for the Sony AVRs, are any sources connected to the Link Amps, what OS and hardware. That is exactly the order we would work in, and it is what surfaced the missing audio path.
• u/CircuitDaemon gave the answer the poster ultimately took: if you want Control4 to be the audio source you need an audio matrix, and pointed at the Control4 Audio Matrix Switch V3 (16 stereo inputs, 16 outputs) — controller connects over RCA, then each output is assigned to a zone. They also offered a Sonos Port per amp as the alternative, which would make each amp a Control4-visible source and let grouping work through either the Control4 driver or the Sonos app.
• u/FrozenHoser questioned whether the poster was a dealer or an end user and suggested talking to a dealer either way.

The original poster said the matrix explanation was what he needed. We would add only that a matrix and our recommendation are not in conflict — a matrix solves the audio-path half; it does not give you volume control at a keypad on the Link Amps, because that half has no protocol to work with.

What we would need to answer this for your house

If you are looking at a rack and cannot tell whether you have a driver problem or a wiring problem, send us:

• What is physically feeding the amps right now
• What matrix or switch is in the rack
• What the Connections tab shows for the amp's driver

We will tell you whether there is any path worth chasing or whether you are simply buying new amplifiers. We will look for free either way.

Disclosure: we are a Control4 and Lutron dealer and we do this remotely for a living. You do not need to hire anybody to answer this one.