Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
1–10 of 49 posts
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#2This is cool! I wonder if you connected just one of the audio outputs to a speaker with a crossover, the system would adjust to put the whole frequency range through it?
It may also be that there's somewhere on the pcb you can tap into line level full frequency audio (or maybe not - they could easily do the filtering only in the digital domain)
One thing to keep in mind when doing this is the impedance of the speakers.
I'd measure the resistance across the IKEA ones and whatever speakers you're using first. It may be that the IKEA ones are not the common 8 ohms. If they're more (eg 16 ohms) there's a risk that an 8 ohm speaker will result in too much current through the amplifier.
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#3Clever. Don't go frying the amp hooked up to those big towers. :)
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#4Quite dangerous to leave this without an enclosure, since the power supply is on the same PCB, several of the components and solder points carry mains voltage.
I'm surprised an outlet as high profile as Make don't at least recommend one, or have any of the usual warnings about high voltage.
On a side note, it's no mean feat integrating large through hole components and tiny SMD parts onto the one PCB, normally power supplies are wave soldered while SMD parts need reflow instead, and hence TVs and the like use seperate PCBs. Pin-in-paste[1] is possible, but only with some parts, so maybe they used automated selective soldering[2] instead?
[1] https://www.7pcb.com/blog/the-application-of-the-pin-in-past...
[2] https://www.nordson.com/en/divisions/select/soldering-proces...
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#5Anyone knows how much power that amp can source? Impossible to find any numbers.
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#6What would it take to connect those two outlets to the line ins of a sub / speaker?
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#7Clever. Don't go frying the amp hooked up to those big towers. :)
IIRC the only way to fry an amp is to hook it up with no load. Putting not enough load will fry the load when the amp overdrives it, putting too much load will simply make for a quiet speaker.
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#8There's very little chance that the crossover filter topology, as well as any biquads in either bandpass are appropriate for a two way loudspeaker other than the original.
Solid looking unit from the teardown, I might have to get one...
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#9This is cool! I wonder if you connected just one of the audio outputs to a speaker with a crossover, the system would adjust to put the whole frequency range through it? It may also be that there's somewhere on the pcb you can tap into line level full frequency audio (or maybe not - they could easily do the filtering only in the digital domain) One thing to keep in mind when doing this is the impedance of the speaker…
If they're built like other active speakers (studio monitors and the like), the crossover is line-level and there is a power amp for each driver. So any full-range signal you get is going to be at line level, not amplified.
Re: Hacking the Sonos IKEA Symfonisk into a High Quality Speaker Amp
#10This is cool! I wonder if you connected just one of the audio outputs to a speaker with a crossover, the system would adjust to put the whole frequency range through it? It may also be that there's somewhere on the pcb you can tap into line level full frequency audio (or maybe not - they could easily do the filtering only in the digital domain) One thing to keep in mind when doing this is the impedance of the speaker…
A speakers' impedance has substantial reactances, and the nominal ohmic ratings have little practical meaning.
Almost all modern class D amplifier ASICS have short circuit protection on their outputs