# Frequency Response not working in Mirror mode to external DAC with QA403 **URL:** \ **Category:** Uncategorized\ **Created:** [September 23, 2024, 1:16am UTC](https://forum.quantasylum.com/t/frequency-response-not-working-in-mirror-mode-to-external-dac-with-qa403/1562 "2024-09-23T01:16:55Z")\ **Posts on this page:** 1\ **Showing post:** 12
**Author:** ![restorer-john](https://avatars.discourse-cdn.com/v4/letter/r/b5a626/32.png) [@restorer-john](https://forum.quantasylum.com/u/restorer-john)\ **Post date:** [September 27, 2024, 12:51am UTC](https://forum.quantasylum.com/t/frequency-response-not-working-in-mirror-mode-to-external-dac-with-qa403/1562/12 "2024-09-27T00:51:04Z")
> [@VAR](#): > > I only have one player to use unless I record it to a CD and try a CD player… You’ll have to convert the exported file from 32bit float 48kHz to 16/44.1 before you burn it to a CDR or the CD player will not play it. Some DVD players might? I’ve been experimenting with CD players too and wanted to get @matt to chime in and confirm a bit on the triggered functions. At 32kFFT/48ksps: The preamble can be low level dither? The trigger tone is 50mS (50 cycles) of 1kHz? The gap before commencing acquisition is ~35mS? Does it have to be exactly that? The expo chirp is 300mS@48ksps? I wanted to be able to make my own files for burning to CDR, without having to SRC the 32/48 to 16/44.1 as we cannot do 44.1 natively in the QA403. (I figure that needs another XTAL TCXO?) Cheers, John --- _[View the full topic](https://forum.quantasylum.com/t/frequency-response-not-working-in-mirror-mode-to-external-dac-with-qa403/1562)._