Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Getting audio signal from IKEA Symfonisk (SONOS)
Getting audio signal from IKEA Symfonisk (SONOS)
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 5th February 2020, 10:58 PM   #1
Sunkan is offline Sunkan
diyAudio Member
Join Date: Feb 2020
Default Getting audio signal from IKEA Symfonisk (SONOS)

I would like to get a clean audio signal from my IKEA Symfonisk in order to connect my speakers to my SONOS network. I basically want a $99 SONOS AMP with mono output to ceiling speakers.

I started looking into doing this after seeing this teardown video on Youtube:

I found this guide where the author connected a RCA connector to the audio signal from the DAC chip (PCM5101A):


I tried this method and was surprised to hear a superb sound coming out of my speakers, until the system tried to deliver som bass. The sound gets muffled when there is some bass in the the track. I have two theories of why I am not getting a clear audio signal, theory 1 is that it has something to do with the mixing of the two audio channels. As the author states in his guide:

The Symphonisk uses two unbalanced outputs from the DAC. One for the low frequency driver and one for the high/mid driver. We will combine these outputs, relying on the existing resistors to create a passive summing mixer circuit. The software crossover will be adjusted by the Truplay tuning to fix the frequency response to match the new speakers.
My other theory is that when soldering the connector into the circuit, you probably should cut off the rest of circuit from that point on so the Symfonisk PCB doesn't try to use the signal at the same time that the RCA connector is trying to send the same signal to an external amplifier.

My questions that I need some help answering is:

- Should the passive summing work, or are there a better way I can sum the signals?

- Should I try to desolder the resistors on the analog signals coming out of PCM5101A in order to prevent the signal from being shared with the rest of the circuit? Do you think this will make a huge difference?

- Would it be possible to use a device like this and connect to the I2S digital audio bus in order to get an analog signal? audio - How to make PCM5102 DAC work on Raspberry Pi ZeroW? - Raspberry Pi Stack Exchange
Would the external device and Symfonisk circuit be able to decode the I2S signal with a parallel connection to the same bus?

The DAC is this one: http://www.ti.com/lit/ds/symlink/pcm5101a.pdf

Thanks for any help! I will make sure to give back by writing a guide on how to do it if I can make it work!
  Reply With Quote
Old 6th February 2020, 12:25 AM   #2
Markw4 is online now Markw4  United States
diyAudio Member
Join Date: Jul 2016
Location: California
What does the bass sound like if you only connect one of the summing resistors to your hi fi at a time? Does one resistor have clear bass on it, and the other have clear HF?

What resistor values are you using?
  Reply With Quote
Old 6th February 2020, 01:09 AM   #3
Sunkan is offline Sunkan
diyAudio Member
Join Date: Feb 2020
I was just about to try out the speaker with only one channel at a time like you suggested, but thought I should try to just plug in headphones first to hear what it sounds like. I played the same tracks with two identical headphones, one connected to the Symfonisk DIY line out and the other to my iPad. The bass sounds just fine through the headphones, I can even tell that the trueplay process seems to have set the Symfonisk in a state where it overcompensates for the lower frequencies. I will try some other speaker tomorrow, until then I am open for suggestions for things to try out.
  Reply With Quote
Old 6th February 2020, 01:10 AM   #4
Sunkan is offline Sunkan
diyAudio Member
Join Date: Feb 2020
Also I am using the guide linked above to hook into the audio signal. The resistors are the ones on the Symfonisk PCB. They aren’t labeled.
  Reply With Quote
Old Today, 10:04 AM   #5
devilsinkpot is offline devilsinkpot
diyAudio Member
Join Date: Feb 2020
Hi Sunkan
I‘m looking into this, too. Did you get any further with it? In my case, I have some very good active speakers I like to integrate into the Sonos system, so I‘m looking for a clear, merged line level output.
  Reply With Quote


Getting audio signal from IKEA Symfonisk (SONOS)Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sonos play 3 dannycelluk Power Supplies 5 13th September 2018 08:15 AM
SONOS Play 5 xrk971 Multi-Way 5 11th April 2018 05:29 PM
The SONOS Investment Yay or Nay? ryetgr Everything Else 3 24th September 2014 07:59 PM
Convert HDMI audio signal to 5.1 analog audio TMStamp Digital Line Level 3 2nd October 2012 06:53 PM
PWM signal to Audio signal possible? thx_dts71 Class D 2 11th November 2008 03:38 PM

New To Site? Need Help?

All times are GMT. The time now is 02:22 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio