# Rythmik Subs and Stellar S300 **URL:** \ **Category:** Loudspeakers\ **Created:** [April 12, 2019, 12:18am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312 "2019-04-12T00:18:01Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![robwilgus](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/robwilgus/32/136549_2.png) [@robwilgus](https://forum.psaudio.com/u/robwilgus)\ **Post date:** [April 12, 2019, 12:18am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/1 "2019-04-12T00:18:01Z")
So do the Rythmik subs, when using the high level inputs, have any similar connectivity issues with the Stellar S300 (Class D amp in general) like the REL’s or other subs do re: grounding? ---
**Author:** ![dawkinsj](https://avatars.discourse-cdn.com/v4/letter/d/a5b964/32.png) [@dawkinsj](https://forum.psaudio.com/u/dawkinsj)\ **Post date:** [April 12, 2019, 12:25am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/2 "2019-04-12T00:25:46Z")
Yes, if you are going to use the speaker level inputs you will have to connect the ground cable on the amp end to an alternative ground. ---
**Author:** ![robwilgus](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/robwilgus/32/136549_2.png) [@robwilgus](https://forum.psaudio.com/u/robwilgus)\ **Post date:** [April 12, 2019, 12:31am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/3 "2019-04-12T00:31:26Z")
Cool…thanks. So the ground would be done in the same manner as Paul described for the REL’s I assume. ---
**Author:** ![dawkinsj](https://avatars.discourse-cdn.com/v4/letter/d/a5b964/32.png) [@dawkinsj](https://forum.psaudio.com/u/dawkinsj)\ **Post date:** [April 12, 2019, 12:35am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/4 "2019-04-12T00:35:23Z")
Yes, I use a separate wire stripped on both ends to tie the two negative leads together on the amp end and then run that wire to the grounding point on another piece of gear like a phono pre or line conditioner. ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [April 12, 2019, 12:41am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/5 "2019-04-12T00:41:15Z")
Can somebody explain the issue here for the benefit of those who might not know. ---
**Author:** ![dawkinsj](https://avatars.discourse-cdn.com/v4/letter/d/a5b964/32.png) [@dawkinsj](https://forum.psaudio.com/u/dawkinsj)\ **Post date:** [April 12, 2019, 1:01am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/6 "2019-04-12T01:01:26Z")
The ground terminal on Class D amps is not a true ground so you have to give the subwoofer’s amp a ground from another source. ---
**Author:** ![brett66](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/brett66/32/92201_2.png) [@brett66](https://forum.psaudio.com/u/brett66)\ **Post date:** [April 12, 2019, 2:46am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/7 "2019-04-12T02:46:43Z")
I’m driving two Rythmik L12 subs off my M700 through a Jensen transformer as the L12 don’t have high-level inputs. No separate ground to another device and zero hum, hiss or otherwise. ---
**Author:** ![robwilgus](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/robwilgus/32/136549_2.png) [@robwilgus](https://forum.psaudio.com/u/robwilgus)\ **Post date:** [April 12, 2019, 2:49am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/8 "2019-04-12T02:49:07Z")
Mine is the F12SE. Just rcvd it and waiting for power cord and speaker cables. ---
**Author:** ![brett66](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/brett66/32/92201_2.png) [@brett66](https://forum.psaudio.com/u/brett66)\ **Post date:** [April 12, 2019, 2:52am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/9 "2019-04-12T02:52:26Z")
With the A370PEQ amp with HPF outputs and speaker level inputs? I would ask Enrico [tech@rythmikaudio.com](mailto:tech@rythmikaudio.com) or Brian [briand@rythmikaudio.com](mailto:briand@rythmikaudio.com) at Rythmik what they recommend. ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [April 12, 2019, 2:56am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/10 "2019-04-12T02:56:11Z")
Don’t they share a common ground via the earth pin on the power cable? ---
**Author:** ![dawkinsj](https://avatars.discourse-cdn.com/v4/letter/d/a5b964/32.png) [@dawkinsj](https://forum.psaudio.com/u/dawkinsj)\ **Post date:** [April 12, 2019, 2:58am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/11 "2019-04-12T02:58:20Z")
The Jensen provides the alternative ground. I own two F12SE’s in the Main system and two F12G’s in the Family Room system and have had the discussion with both Brian and Enrico. They will stick to their guns on running it off of the preamp to prevent problems from improper high level input and based on the number of times this question gets asked on this forum alone I don’t blame them. My method works without buying extra devices and is exactly what REL recommends as does Paul with the BHK amps which have the same grounding issues. The Jensen device is what you had to do to connect speaker level the OP does not have that problem. ---
**Author:** ![dawkinsj](https://avatars.discourse-cdn.com/v4/letter/d/a5b964/32.png) [@dawkinsj](https://forum.psaudio.com/u/dawkinsj)\ **Post date:** [April 12, 2019, 2:59am UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/12 "2019-04-12T02:59:54Z")
No, it’s not enough and different type of ground. ---
**Author:** ![robwilgus](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/robwilgus/32/136549_2.png) [@robwilgus](https://forum.psaudio.com/u/robwilgus)\ **Post date:** [April 12, 2019, 6:57pm UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/13 "2019-04-12T18:57:14Z")
> [@dawkinsj](#): > > Yes, I use a separate wire stripped on both ends to tie the two negative leads together on the amp end and then run that wire to the grounding point on another piece of gear like a phono pre or line conditioner Would you be able to provide a picture or diagram of your grounding solution? Thanks. ---
**Author:** ![robwilgus](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/robwilgus/32/136549_2.png) [@robwilgus](https://forum.psaudio.com/u/robwilgus)\ **Post date:** [April 19, 2019, 8:31pm UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/14 "2019-04-19T20:31:03Z")
Does the ground wire need to be the same gauge as the speaker wires? ---
**Author:** ![dawkinsj](https://avatars.discourse-cdn.com/v4/letter/d/a5b964/32.png) [@dawkinsj](https://forum.psaudio.com/u/dawkinsj)\ **Post date:** [April 19, 2019, 8:45pm UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/15 "2019-04-19T20:45:37Z")
No. My sub cables are 12 gauge and the ground wire is a single 20 gauge cable from a auto speaker kit. Just use what you have laying around. ---
**Author:** ![robwilgus](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/robwilgus/32/136549_2.png) [@robwilgus](https://forum.psaudio.com/u/robwilgus)\ **Post date:** [April 19, 2019, 8:52pm UTC](https://forum.psaudio.com/t/rythmik-subs-and-stellar-s300/10312/16 "2019-04-19T20:52:26Z")
Thank you!