The items that fit your Volvo S40 are shown below.

High Performance/ Premium Sound Systems Examples

All Volvo C30/C70/S40 and V50 car models from 2004-2012 had 3 different sound systems:

1. Performance Sound (NON-AMPLIFIED)

This was fitted as the standard sound system for most of these Volvo Models. Although it had a couple of variations in its model years, it typically consisted of a standard 6 or 8 speaker set up system

2. High Performance Sound (Amplified)

This was fitted both as standard on Higher Spec Volvo models and as an optional upgrade. An easy way to tell if your vehicle is fitted with this system is when the radio powers up it will show on the radio display as 'HIGH PERFORMANCE SOUND'

3. Premium Sound (Amplified) Either DYNAUDIO or DOLBY PRO LOGIC II

This was fitted as an optional upgrade. An easy way to tell if your vehicle is fitted with this system is when the radio powers up it will show on the radio display as PREMIUM SOUND' This sound system is easier to identify as their will usually be a DYNAUDIO badge on some of the sound equipment. For E.G. On top of the centre speaker above the radio (Centre Dashboard)

Below are some examples of the sound systems installed on C30 and C70 (2007-2013) car models