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marky4556
Contributor I
April 23, 2019
Answered

Sonos Amp with Acoustic Landscape AS41SYS

  • April 23, 2019
  • 21 replies
  • 2004 views
I have been disappointed in the Sonos Amp and how it performs with an Acoustic Landscape AS41SYS. The AS4.1 consists of 4 satellite speakers and 1 sub that presents it's self as an 8 ohm load to the receiver. I previously had this system powered by a Yamaha RX-V667 receiver rated at 90w per channel @ 8 ohms. I had tried a Sonos Connect:Amp and it simply didn't produce enough volume. I recently purchased the Sonos Amp rated at 125w per channel @ 8 ohms and really I can't tell a difference between the Sonos Amp and Sonos Connect:Amp. The Yamaha RX-V667 produces more volume (albeit without all the Sonos features). It confuses me that the Yamaha RX-V667 rated at 90w per channel out performs the Sonos Amp rated at 125w per channel both at 8ohms. The speaker setup is the same when testing both receivers. Some of the runs are long (~200 FT) but I used all 12AWG oxygen-free stranded copper.

Sonos support is chewing on this, but I was wondering if others out there have tried this paring. I sent it the diagnostic report when asked and she said there were no obvious issues.
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    Best answer by marky4556
    I thought i would follow up before closing this topic. After working with Sonos tech support, we determined that the Sonos Amp was not faulty, but instead not the best pairing for the Acoustic Landscape AS4.1. This was in part because the Sonos Amp lacks the dynamic range amplification 8/6/4/2 ohms for 125/160/190/230W for Front L/R.

    I ended up returning the Sonos Amp and buying a Sonos Connect and paired it with an Audio Control Rialto 400 amplifier at the recommendation of Origin Acoustics (maker of the AS4.1 system). I am much happer. While i wish i could have gotten down to one unit, the Rialto 400 does a much better job of driving the AS4.1 system and even allows me some room for growth in speakers.

    I appreciate Sonos technical support team's help.

    21 replies

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    Kumar
    May 10, 2019
    There are no stated specs for the Connect Amp at anything lower than 8 ohms.

    For both the Sonos units, the 4 ohms power delivery is stated to be about double of that at 8 ohms.
    And every speaker specified as nominal 8 ohms drops impedance in response to power needs for different frequencies, the only difference between speakers being how much the drop. Bad designs can even drop to 2 ohms. And even if that was the case here, the Sonos Amp would cut out if that happened for long enough periods; it would not sound less loud across the board. It would also not sound just as loud as Connect Amp, as you have said.
    I too suspect that Sonos support was lazy, seeing that the alternative outcome involved another expensive Sonos product. I doubt that the Amp spec is dishonest, seeing reports here that speak of audibly louder sound from the Sonos amp compared to the Connect Amp.
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