Dell Studio XPS 1645 (Late 2009) - Manual (Page 68)

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Basic Specifications
Audio
Audio type
5.1 channel Dolby Digital
High Definition audio
Audio controller IDT 92HD73C HAD codec
Stereo
conversion
24‑bit (analog‑to‑digital
and digital‑to‑analog)
Internal
interface
High Definition audio
External
interface
one microphone‑in
connector,
two stereo headphones/
speakers connectors
Speaker two 4‑ohm main speaker
with one 4‑ohm subwoofer
Internal speaker
amplifier
2 watt per channel with
3 watt subwoofer
Volume controls program menus, media
control buttons
Ports and Connectors
IEEE 1394a
4‑pin serial connector
Network adapter one RJ45 10/100/1000
connector
USB two 4‑pin USB
2.0‑compliant
connectors
eSATA one 4‑pin eSATA/USB
combo connector
Video one 15‑hole connector
HDMI one 19‑pin connector
DisplayPort one 20‑pin connector