Asus Xonar

Asus Xonar is a lineup of PC sound cards by Taiwanese electronics manufacturer ASUS.
The lineup currently comprises the following models:

Product	Form factor	Release date	Notes	References
Xonar AE	PCIe			[1]
Xonar AV1	PCIe
Xonar D1	PCI			[2]
Xonar D2	PCI
Xonar D2/PM	PCI			[3]
Xonar D2X	PCIe		PCI Express version of the Xonar D2
Xonar DG	PCI			[4]
Xonar DGX	PCIe	13 March 2012[5]	PCI Express version of the Xonar DG	[6]
Xonar DS	PCI			[7]
Xonar DSX	PCIe	13 March 2012[5]	PCI Express version of the Xonar DS	[8]
Xonar DX	PCIe	8 February 2008[9]		[10]
Xonar Essence One	External (USB)	26 August 2011[11]	Interchangeable op-amps. Later released same card with different installed op-amps as Essence One Plus and MUSES Edition.
Xonar Essence ST	PCI	18 May 2009[12]		[13]
Xonar Essence STU	External (USB)
Xonar Essence STX	PCIe	13 November 2008[14]	PCI Express version of the Xonar Essence ST	[15]
Xonar Essence STX II				[16]
Xonar Essence STX II 7.1
Xonar H6	PCIe		DAC expansion board for HDAV1.3 and Essence ST.[17]
Xonar HDAV	PCIe
Xonar HDAV1.3
Xonar Phoebus	PCIe	12 April 2012[18]	The two sound cards are the same; the Phoebus comes bundled with an external desktop controller that is not included with the Phoebus Solo.[19]	[20]
Xonar Phoebus Solo		22 April 2013[19]
Xonar SE	PCIe	July 2019		[21]
Xonar STX	PCIe
Xonar U1	External (USB)
Xonar U3		23 December 2014[22]		[23]
Xonar U5		14 July 2014[24]		[25]
Xonar U7[26]		April 2013		[27]
Xonar U7 MKII		12 December 2016[28]		[29]
Xonar Xense	PCIe

• 
  Xonar DG
• 
  Xonar DX
• 
  Xonar D2/PM
• 
  Xonar U1