Question Hooking up a sub woofer

Aug 23, 2019
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Hi Guys,
Need a little help here.

I have 2 polk Atrium SDI 8 (one on each channel)
https://www.amazon.com/Polk-Audio-Atrium-Speaker-Single/dp/B00378KMIC?th=1

hooked up to a Crown Power Amp (it is a 2 channel amp)
https://www.amazon.com/gp/product/B003HZPKSM/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

and I want to connect a Polk Atrium Sub 10
https://www.amazon.com/Polk-Audio-Atrium-Grey-Speaker/dp/B07DYH27NP/ref=sr_1_1?crid=1L2NZ6Q3XYB1K&keywords=atrium+sub+10&qid=1566556871&s=electronics&sprefix=atrium+sub+,electronics,385&sr=1-1

Please help me find the easiest way to hook it all together.

Thanks
 
Feb 16, 2019
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Hi. Neither Polk manual mentioned impedance. If you have a multimeter, you can measure the DC resistance of the coils. If it's 6 ohms or greater, you're good. I did find a connection graphic in the manual on p12 for the sub/sat. The sub/ sat connection page has this graphic. It appears to be designed with impedance in mind. You can't go below 4 ohms with your amp. Also, the sub is designed to be paired with different satellites, with their own frequency response characteristics. We're talking about the region where the sat's lower roll-off and the sub's upper roll-off coincide. Pairing sats and subs this way couold either result in a dip or peak where these frequencies aren't covered or they overlap. I didn't see specifications regarding this frequency point, so testing and experimenting might be your best option.

See page 12 (PDF MANUAL)
https://s3-us-west-2.amazonaws.com/assets.soundunited.com/polk/product_documents_legacy/AtriumGarden_MN.pdf?mtime=20160701170000
 
Since the Crown is stable into 4 ohms and the sats and sub are 8 ohms you can connect them in parallel to the amp. Problem will be that you won't have a way to adjust the bass level to match with the sats. To be able to do that you will need a separate amp to drive the sub. Since it's a dual voice coil driver you can use a stereo amp.
 
Reactions: Sonic Illusions
Feb 16, 2019
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As long as 8 ohms can be verified. Did not see it. Good catch - a bit under the weather today; limited time.

You may determine the sats and sub sound fine with the 2 CH amp after experimenting and before getting a dedicated sub amp. Experiments can and do pay off!
 
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