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How to split stereo into stereo plus sub out?

Consider a budget system that plays HD music files from a PC using either USB or Aptx HD Bluetooth. If I am using a DAC similar to the SMSL M400 or Topping D90SE and it is connected to a Yamaha P7000S amp which powers a L and R speaker, what is the best way to add dual powered subwoofers?
I own two SB-2000 subwoofers, but I am not sure how to connect them into the system above because the amp doesn't have any sub-out or pre- outputs of any type.

I have not purchased the SMSL M400 yet, but none of the devices in its class have subwoofer outputs (as far as I have seen).
Without spending a lot of money, how should I connect my two powered subwoofers into this system? Thank you.
lowoverdrive
lowoverdrive OP
169 posts
 
Here is my system page where you can see a photo of the LOC mod that I did ...
That's an amazing looking system! Wow.
In regard to the free way and the $20 way, my amp only has outputs for 2 speakers. I'm using banana plugs and good quality speaker wire.

I assume I need to make some splitter cables so I can connect both the existing speakers and the LOC to the same output from my amp.

I don't know enough to ask the right question, but it seems that I should be concerned about impedance or other similar issues if I put a splitter in the system. Is that true?
fuzztone's avatar
fuzztone
5,591 posts
 
For free.

Connect the speakers to the speaker outs on the sub.  

millercarbon's avatar
millercarbon
12,531 posts
 
You do not need a splitter. Connect the LOC to whichever speaker outs you want. At 20k (or more) the LOC presents near zero load to the amp. It will not affect anything. Also the bass being used to drive the subs is so low it is not even stereo. So you could if you wanted connect all the subs to just one channel.  

You are right to be thinking about impedance however at 20k ohms or even higher it simply is not a factor.
mesch
3,476 posts
 
If subs have speaker level inputs you can use the same speaker binding post for both main speakers and subs. The high impedance of the sub amps will prevent current draw from amplifier.
bryhifi's avatar
bryhifi
374 posts
 
SVS SB-2000 do not have speaker level input, line level in only.
It sounds like you will be using the DAC as the volume control.
If you are using RCA cables from the DAC to the Yamaha amp then the easiest way to deal with this is to buy an RCA Y-adapter for left and right channels. Plug Y-adapter into DAC and run RCA cables to everything.

https://www.amazon.com/Mediabridge-ULTRA-RCA-Y-Adapter-Inches/dp/B005DL2OVE/ref=psdc_172544_t2_B004E...
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