Usually no if you sell the system with the car
Assuming that you are asking about installing an after-market audio amplifier to boost the sound coming from the factory radio in your Forester, this is still too broad in scope to give a meaningful answer here. Contact www.crutchfield.com. These people are experts in car audio. --Ken
These have been refurbished and tested by JL Audio directly with factory specifications. 100% JL Audio parts
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I think you should contact Sondpex Inc. Their representatives are very helpful especially when it comes to installing home audio equipments.
The best reviews for buying auto audio systems was with www.crutchfield.com. They provide great products and helping installing information. If any problems occur while installing your audio system or after it is in use, there are many available support options to help with your needs.
An audio CD typically can hold up to 700 MB.
No
Try re-installing the software.
Normal audio CDs hold 700 megabytes of data.
The steering wheel controls will work with some decks. Depending on the brand and model, you have to purchase an adapter that will allow your controls to work. However!!!, if you remove your factory deck, you will loose many options. eg. low tire pressure, change oil, etc. One way of installing an after market deck is to move your factory deck into the trunk and install a new head unit.
An audio CD typically can hold up to 700 MB.
A person who works installing audio systems in home may receive some technical vocational training if they want to work for a company. However, if a person has the proper experience, no training may be required at all.