# RAAL-requisite HSA-1b - Switch Drive Amplifier Review **URL:** \ **Category:** DACs and Digital\ **Tags:** headphone-amp, amplifier, sr1a, speakers, ribbon\ **Created:** [January 1, 2021, 8:59pm UTC](https://forum.headphones.com/t/raal-requisite-hsa-1b-switch-drive-amplifier-review/9973 "2021-01-01T20:59:35Z")\ **Posts on this page:** 1\ **Showing post:** 14
**Author:** ![Torq](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.headphones.com/torq/32/16384_2.png) [@Torq](https://forum.headphones.com/u/Torq)\ **Post date:** [January 2, 2021, 3:38pm UTC](https://forum.headphones.com/t/raal-requisite-hsa-1b-switch-drive-amplifier-review/9973/14 "2021-01-02T15:38:59Z")
> [@sapirg](#): > > I would like to know how sound MySphere 3.2 with the new amplifier The HSA-1b has the same basic effect on the MySphere 3.2 as it does on the SR1a and other headphones, so the descriptions on sound in the review largely apply there too. > [@sapirg](#): > > What is the difference between MySphere 3.2 and SR1a? What do you prefer between them and why? Other than being based on entirely different technology, the best answers I can give will be found in [this thread](https://forum.headphones.com/t/lb-acoustics-mysphere-3-floating-over-ear-dynamic-headphone-official-thread/3552), and probably [this post](https://forum.headphones.com/t/lb-acoustics-mysphere-3-floating-over-ear-dynamic-headphone-official-thread/3552/20) in particular. --- _[View the full topic](https://forum.headphones.com/t/raal-requisite-hsa-1b-switch-drive-amplifier-review/9973)._