Features:
Surround Virtualizer (for built-in speakers):creates a virtualized surround sound experience over the PC’s built-in speakers or over headphones.
Volume Leveler: maintains a consistent volume across all content and applications according to where the user sets the volume level.
Volume Maximizer: boosts the level of the audio signal so users can turn up the volume without causing noise or clipping.
Graphic Equalizer: lets consumers tailor audio to their exact specifications using high-quality digital filtering.
Audio Optimizer: improves the frequency response of the PC’s built-in speakers so content sounds true to the creator’s intent.
Audio Regulator: eliminates or reduces distortion caused by the combination of overdriven speakers and amplifiers.

Features:
Dolby Home Theater v4 contains all Dolby Advanced Audio v2 features, plus:
Surround Decoder:converts stereo content into 5.1- or 7.1-channel surround sound and converts 5.1 surround sound into 7.1 surround sound.
Dialogue Enhancer: improves intelligibility of dialogue across all types of content.
Intelligent Equalizer: monitors and adjusts audio to match the user’s chosen preset.
Dolby Digital Output: provides real-time encoding of PC content into the Dolby Digital format over S/PDIF or HDMI™ outputs; users can then enjoy audio content from their PCs in surround sound on their home theater systems.

DAAv2
DHTv4

1. Siapkan default sound driver agan buat jaga-jaga.
   
2. Jika sound driver agan saat ini Realtek, Uninstall dulu sebelum install Dolby.
   
3. Install driver berdasarkan versi OS (32/64) bit.
   
4. Sewaktu Install, pilih "DHT (Release)" jika meng-install Home Theater. Atau pilih "DAA (Release)" jika meng-install Advanced Audio.
   

Kalau install-an agan berhasil, nanti di Speaker Dolby bakal muncul di Sound. Klik kanan trus pilih sebagai Default.
Cara akses: Klik kanan Speaker Icon di Taskbar > Sound > Playback.



Kalau gak berhasil, silakan baca Troubleshoot.
Untuk pengguna Windows 8, silakan baca link Dolby Home Theater now on ThinkPad on your areadi bagian Source.

• (Khusus ThinkPad)
  External Speakers do not work when connected via Dockingstation.
  How to fix: Connect Speakers to your ThinkPad directly.
  
• Dolby Drivers only work when they can access the Conexant or Realtek Sound Chip. This means you either have to use the internal Speakers, the Audio Jack or HDMI/Displayport. No USB, no Bluetooth. Sound will play, but will sound terrible then.
  How to fix: Not at all. All you can do is buy Headphones or external Speakers which can be connected via the Audio Jack.
  
• Sound plays on wrong speakers. For example, even if you have external speakers connected to your ThinkPad, sound might still be played using the internal ones.
  How to fix: This rarely happens, but if it does only rebooting helps so far.
  

Dolby Latest Surround Sound for PCs
Dolby Home Theater v4 for most Lenovo Laptops
Dolby Home Theater now on ThinkPad on your area