The 8-track cartridge tape speed was slower ( ips compared to Fidelipac's  ips) and did not have adequate tape support pads, and thus was not "broadcast quality." The lower speed and narrower tracks in 8-track cartridges led to higher noise and reduced frequency response.
The 8-track cartridge's slower tape speed and insufficient tape support pads led to inferior sound quality compared to Fidelipac's technology. This resulted in higher noise levels and reduced frequency response due to the narrower tracks.