I’m beginning to think I’ll have to bite the bullet and take it to an installer. Sounds as if it’s going to be expensive
You need to be quite adept at removing trim and nimble to access that area. It's the time taken to access it and install it properly that does make it a more expensive proposition, yes. The area may need soundproofing with sound deadening mat to stop resonance.
The good news is though that it's not wasted if you decide to carry on upgrading. Even if you end up adding an amp and DSP, it can still use whatever speakers you install / get installed.
The rainbow that I’ve just bought from Germany is an 8. I’ve been assured it’s a straight swap. Problem is how do I do it? I never had this problem with my RS2000 L.O.L.
I'm sure I read the 213 used a 6" woofer but having looked, I can only find evidence that supports the 8" is the correct driver. So it sounds like you have the correct replacement driver in that case thankfully!
I’m also waiting forACR Car Audio to get back to me and confirm the Rainbow 5.25 speakers will fit in the back doors. I’ll then get a price for fitting speakers + amp.
You should consider replacing the tweeters and mids in the front doors if you are going to the trouble of doing the woofers, rear doors and adding a sub. Rainbow do replacements for those as well although you could leave those to see if you are happy with the results.
I still wonder if you are going to achieve a good sound without a DSP but try it and see!
RS2000? ...yes, I too remember the old days of installing upgraded ICE. Having done my own in the 90s and early 00s for an 87 Opel Manta GTE, 89/90 Astra GTE 16V x 2, 90 XR3i, 93 E36 325i, 97 E36 M3 Evo, 97 E36 328i, I remember how easy it was despite the gradual incline in complexity in what I installed. I even had the seats out in the XR3i to mount the amps underneath!
If you adept at removing trim, it's probably a lot quicker.
My problems these days are not being the most nimble any more, not being the youngest any more and just the time it takes a novice to remove the correct trim, and knowing the pitfalls of what you are putting where.
Also the kit and safety in cars is a lot more complicated than back then - you don't want to interfere with anything that might not work as it should... not to mention you can't just remove the headunit, replace and run some RCAs and other cables front to back so easily as it's all on a fibre-optic "MOST" ring until after the factory AGW. Also having diagnostics is helpful to ensure you've not messed anything up when refitting everything.
It's a nightmare for the amateur!
I'm not an expert nor professional btw, just an amateur with some experience and a personal interest in it.
Be interesting to hear what you think though...