# RAAL-requisite HSA-1a - True Ribbon Headphone & Speaker Amp - Official Thread

**URL:** https://forum.headphones.com/t/raal-requisite-hsa-1a-true-ribbon-headphone-speaker-amp-official-thread/6029
**Category:** DACs and Digital
**Tags:** raal-requisite
**Created:** [April 7, 2020, 11:09pm UTC](https://forum.headphones.com/t/raal-requisite-hsa-1a-true-ribbon-headphone-speaker-amp-official-thread/6029 "2020-04-07T23:09:47Z")
**Posts on this page:** 1
**Showing post:** 95

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### 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: [May 30, 2020, 7:55pm UTC](https://forum.headphones.com/t/raal-requisite-hsa-1a-true-ribbon-headphone-speaker-amp-official-thread/6029/95 "2020-05-30T19:55:31Z")

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> [@mimaximax](#):
>
> Do you use tools with metrics in order to analyze this or is this a subjective test?

Both.

> [@mimaximax](#):
>
> Your SR1a burn-in phase should have been completed for its sound not to change in the time being, right?

I’ve had my set of SR1a for a [year](https://forum.headphones.com/t/raal-requisite-sr1a-earfield-monitor-headphone-official-thread/3220/39) now, and they’ve got \>2,000 hours on them, so yes they’re more than burned in by this point … and were before the first HSA-1a showed up.

So there was no break in listening to them, I was just running them off my big Chord stack (including Étude → SR1a interface) while the HSA-1a was away. And sometimes off the Jotunheim R.

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