A real budget strengthening of the acoustics will be possible if the driver not only buys the necessary equipment, but also installs it himself, saving on the services of a car dealership. It is true that this is only necessary if there is experience of this kind of work, or even greater self-confidence. A different sound in the cabin will sound when the 5-channel sapbuer is installed (Hyundai ix35 is not present) and the amplifier is compatible with it. You need to take the necessary transactions with them.