haskellcurrying
Member
- Joined
- Feb 16, 2021
- Messages
- 17
- Likes
- 6
So I'm (mostly) retiring my Denon HEOS Link for a Topping E30.
Unfortunately doing so has gotten me into a bit of a pickle. Currently, the Link has a Sub/LFE output that is summed in the digital domain. That LFE output is pumped into my single channel DSPeaker antimode and then finally to my sub. Obviously the E30 doesn't have a sub out, or even a second set of output channels, so my plan was to sum the line-level L+R output of my amp and feed that to the antimode.
Turns out passive analog summing is weird.
It looks like one can use a basic stereo to mono summing circuit like this:
https://www.amazon.com/OSD-Audio-SM...coding=UTF8&psc=1&refRID=6YBAH35A6GAV0GJZDN6F
or a variable level mixer like this:
https://www.amazon.com/Portable-Cha...coding=UTF8&psc=1&refRID=6YBAH35A6GAV0GJZDN6F
That said, looking at some diagrams/board shots for these summing circuits, if the resistance added to each channel before summing isn't bang on, the summing will result in a channel bias.
Now I know they make 1% error resistor, but I don't know what's being used in any of these low end devices. I could buy a nice mixer, but that seems like serious overkill and probably out of my budget. I could probably buy a nicer audio processor that has proper sub/lfe out, but again I've got a 2.1 setup and the E30 already fits the bill otherwise. Plus I got it for $100 locally.
So what do I do?
Unfortunately doing so has gotten me into a bit of a pickle. Currently, the Link has a Sub/LFE output that is summed in the digital domain. That LFE output is pumped into my single channel DSPeaker antimode and then finally to my sub. Obviously the E30 doesn't have a sub out, or even a second set of output channels, so my plan was to sum the line-level L+R output of my amp and feed that to the antimode.
Turns out passive analog summing is weird.
It looks like one can use a basic stereo to mono summing circuit like this:
https://www.amazon.com/OSD-Audio-SM...coding=UTF8&psc=1&refRID=6YBAH35A6GAV0GJZDN6F
or a variable level mixer like this:
https://www.amazon.com/Portable-Cha...coding=UTF8&psc=1&refRID=6YBAH35A6GAV0GJZDN6F
That said, looking at some diagrams/board shots for these summing circuits, if the resistance added to each channel before summing isn't bang on, the summing will result in a channel bias.
Now I know they make 1% error resistor, but I don't know what's being used in any of these low end devices. I could buy a nice mixer, but that seems like serious overkill and probably out of my budget. I could probably buy a nicer audio processor that has proper sub/lfe out, but again I've got a 2.1 setup and the E30 already fits the bill otherwise. Plus I got it for $100 locally.
So what do I do?
Last edited: