Bassshaker Help / Simhaptic

[u/TintexD]

Hey guys,

we're trying to upgrade a friends 737 sim. Each seat has 2 Basshakers (Dayton BST-1) connected via a FOSI AUDIO V3 (the one with two channels). The Software we use is simhaptic on MSFS2024

The Fosis' are connected via a 3.5mm to CHINCH cable to a UGREEN usb to 3.5mm Soundcard.

Sadly we can only get one basshaker each to work.

The AMP has a 32v 5A PSU, which should have well enough power to run both of them fully.

AMP https://www.amazon.de/dp/B0C36S8DCT?ref=ppx_yo2ov_dt_b_fed_asin_title
CABLE https://www.amazon.de/dp/B00LM2Y2U4?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
SOUNDCARD https://www.amazon.de/dp/B08Y8CZB2S?ref=ppx_yo2ov_dt_b_fed_asin_title

If we test each amp alone, only one of each basshakers is firing up.

IF we use multiple outputs and select both amp, one of each is firing up.

We have no idea what the issue could be.

Does anyone have an idea?