Making sub output on active speakers

[audiojack]

Hello, looking for some advice. I'm thinking about making a subwoofer output on Edifier s880db active speakers using a level converter, something like this: https://lu.teufelaudio.com/level-converter-ac-5011-ap-102981000 ). It would result in a double sub output, with separate left and right channel RCA outputs.
The master (right) speaker of the Edifier s880db active speakers has a 4 pin speaker (2 cables for woofer and 2 for tweeter) cable output to the slave (left) speaker.

Would it be possible to connect (solder) the Level Converter wires to the woofer driver wires of the master and slave (right and left channel) inside the active master speaker? What to do with the green "ground" wire of the converter?
Would this affect (reduce) the woofer driver power significantly? As I think the level converter itself must use some of the signal, or is this very little?

The edifier s880db goes down to 55Hz, would it be likely that the build in amplifier sends frequencies below 55Hz to the woofer drivers? (else the level converter to sub output is pointless anyways lol). Thanks for the replies.

 

[CPTX]

I've done something similar using a line level converter from a preamp with no passive sub out (no green or ground wire on this model)....then RCA to a small sub amp.
With two passive subs, I'd just use two RCA splitters from the line level converter and purchase a second small sub amp (if using passive subs).

 

[wwenze]

I doubt S880DB sends as low as 55Hz to the woofers... you can try measuring first

 

[MAB]

Hello, looking for some advice. I'm thinking about making a subwoofer output on Edifier s880db active speakers using a level converter, something like this: https://lu.teufelaudio.com/level-converter-ac-5011-ap-102981000 ). It would result in a double sub output, with separate left and right channel RCA outputs.
The master (right) speaker of the Edifier s880db active speakers has a 4 pin speaker (2 cables for woofer and 2 for tweeter) cable output to the slave (left) speaker.

Would it be possible to connect (solder) the Level Converter wires to the woofer driver wires of the master and slave (right and left channel) inside the active master speaker? What to do with the green "ground" wire of the converter?
Would this affect (reduce) the woofer driver power significantly? As I think the level converter itself must use some of the signal, or is this very little?

The edifier s880db goes down to 55Hz, would it be likely that the build in amplifier sends frequencies below 55Hz to the woofer drivers? (else the level converter to sub output is pointless anyways lol). Thanks for the replies.

If Edifier internally filters the sub-bass then a splitter will not wok well. You will need to test this. If it doesn't filter, this will work. You will still need an electronic crossover or a sub with one built in. Why not just get an electronic crossover?

Review and Measurements and miniDSP 2x4 HD DSP and DAC

This is a brief review and measurements of miniDSP 2x4 HD Processor and USB DAC. I purchased this online and seems like the price as of this writing is USD $207 as of this writing. This is a USB DAC with Toslink optical input and analog/digital in, four channel digital signal processor (DSP)...

www.audiosciencereview.com

Or get a sub with a passthrough crossover, like this:

https://www.sweetwater.com/store/detail/ErisStuSub8BT

This thread discusses subs with built in crossovers.

Hi-if subwoofer with line level pass through

I might be barking up the wrong tree, but I’ll give it a go. I’d like a subwoofer, where you output stereo RCAs from your pre-amp/DAC/whatever, then the sub’s crossover does its job and strips out the sub bass, then outputs over stereo RCAs to your amp. The idea being that it removes the need...

www.audiosciencereview.com

Wiring RCA line level outputs to an existing pair of speakers seems a diversion from the goal of simply integrating a sub.

 

[audiojack]

I doubt S880DB sends as low as 55Hz to the woofers... you can try measuring first

What is the best way to measure that?

I tried connecting the wires of the s880db bass-midwoofer to a cable with male 3.5mm jack, plugged that into my laptop and hoped Audacity would pick something up but it didn't register anything. Tried many different settings for the audio/mic input in both Windows and Audacity but it just didn't work for some reason.

Then I played low Hz tones from youtube and attached a subwoofer driver that goes down to 38Hz directly to the wires of the s880db bass-midwoofer, it seemed to produce sound at 38Hz-40Hz (but the s880db bass-midwoofer also made some sound or at least vibrated). Could this indicatie that lower than 55Hz is send to the s880db bass-midwoofer? Thank you.

 

[audiojack]

If Edifier internally filters the sub-bass then a splitter will not wok well. You will need to test this. If it doesn't filter, this will work. You will still need an electronic crossover or a sub with one built in. Why not just get an electronic crossover?

Review and Measurements and miniDSP 2x4 HD DSP and DAC

This is a brief review and measurements of miniDSP 2x4 HD Processor and USB DAC. I purchased this online and seems like the price as of this writing is USD $207 as of this writing. This is a USB DAC with Toslink optical input and analog/digital in, four channel digital signal processor (DSP)...

www.audiosciencereview.com

Or get a sub with a passthrough crossover, like this:

https://www.sweetwater.com/store/detail/ErisStuSub8BT

This thread discusses subs with built in crossovers.

Hi-if subwoofer with line level pass through

I might be barking up the wrong tree, but I’ll give it a go. I’d like a subwoofer, where you output stereo RCAs from your pre-amp/DAC/whatever, then the sub’s crossover does its job and strips out the sub bass, then outputs over stereo RCAs to your amp. The idea being that it removes the need...

www.audiosciencereview.com

Wiring RCA line level outputs to an existing pair of speakers seems a diversion from the goal of simply integrating a sub.

Thank you for the suggestion. I haven't tried miniDSP yet but it seems it could compromise the audio quality and I don't like that the volume control would only be on the miniDSP it would mean that the active speakers need to be permanent on high volume to make volume control from the miniDSP somewhat convenient. Also the Edifier s880db doesn't save volume settings, when turned on it will always start somewhere at half volume regardless of the volume setting when turned off, this would mean I would have to count how many volume increments I need for the right settings every time I turn it on which is not convenient.

 

[audiojack]

I read that (some) simple line out converters can cause distortion? Or won't reproduce sound very well below a certain frequency.
How to make sure that it's a high quality line out converter?

Also read on another forum an expensive alternative, 2x the "Lundahl LL1930 Audio transformer" which would have lower distortion and lower frequency reproduction. Does anyone have experience with the Lundahl?

Best way to connect speaker high-level output to subwoofer RCA low-level line in?

I want to connect my Cayin CS-55 tube amp which doesn't have preout or LFE with my REL HT-1510 ideally two of them. Ideally, I have one volume control in the end.

audiokarma.org

 

[kemmler3D]

Maybe a dumb question but why not just use a Y-cable from your source instead of modifying the speakers?