Ahren Stringer

In this article, this photo shows Ahren Stringer with a Music Man Stingray, and he says, "Me personally, I used a Mesa Classic through a SansAmp, Ernie Ball Music Man guitars – a StingRay – and yeah, that’s pretty much all I used. Keep it simple. It’s a great sound; I love it. It’s nice and easy."

In this video we can see Ahren playing a Musicman Sterling Sub Series

In this picture we can see him playing a Fender Precision Bass

At 2:48 in this video, we can see Ahren playing a Ernie Ball Music Man Stingray HH

In this video, we can see a Ampeg SVT 810 right behind Ahren

In this video, we can see a Ampeg SVT-CL head behind Ahren

"What are you guys using on this album?"

Ahren Stringer: "Me personally, I used a Mesa Classic through a SansAmp, Ernie Ball Music Man guitars – a StingRay – and yeah, that’s pretty much all I used. Keep it simple. It’s a great sound; I love it. It’s nice and easy."

"And the SansAmp – have you been using those for a while?"

Stringer: "Yeah, pretty much since I started playing bass."

There is also another article from Bass Guitar Magazine titled "Ahren Stringer of The Amity Affliction considers bass options" where it lists that he uses "Effects Sansamp."