I don't know about the best sounding speakers... That would depend on variables and your own preferences. I put Rodney's speakers into an 86 GT right before I sold it. With the stock radio they sounded good.
Only Pioneer and Kenwood make 4 x 10 speakers for our cars. I have the Kenwoods on the front and rear and am very pleased. I replaced my non-working sub-woofer with Rodney's, and am also pleased with that. Given the small size of the Fiero cabin, I don't know how much sound you need (or can tolerate). For me the Kenwoods offer all the sound I need at a very reasonable price. Just make sure you follow the installation instructions (available on YouTube), especially on the rear speakers. Also be careful not to crack the dash when installing the two front speakers. b
Higher end is Pioneer, Kenwood, and Kicker. Lower end probably Boss and other knockoff brands. I am currently running a set of 4x10 500 watt 3 way Tekniques, which I love. After reading on here about people complaining about distorting sound quality of an oval speaker I tried building the 4x10 component setup using a template with a 5 1/4 and tweeter (you can find the directions on the forum) but I am one of the few who was unimpressed with it and went back to 4x10's. Its probably the lack of bass output from a 5 inch speaker I think....I have the performance sound sub woofer too.
You have many more options for the 4x6 speakers in the B pillar (assuming you have an 86+) I am running a set of Infinity Kappa 4x6 plate speakers (component design). If you have an 84-85 you have 3.5 inch headrest speakers and I have no advice to give there.
I've have Kicker 4x10. They've done well. Also have Pioneer 4x6 in the b pillars. Sound is good, but had to replace them after a few years because they would start to fatigue after long playing or high volume. I am running a lot of power through the system, so there is that. Stock amp should get longer life from speakers. In fact I put the used ones in another car with a stock system and they have been fine. I had Polk Audio 4x6, was not impressed with quality for the price. Got the Pioneers after that and has been a lot better. Cutchfield is a great place to get car speakers, Parts Express is really good for hardware and home speakers, but their car speakers are usually on the lower end. Be sure to read the user ratings.
If you need inspiration for a sound system see FieroSound. Inspired me to make a good sounding system and gave the idea to put subwoofers behind the seats and a center speaker.
[This message has been edited by liv4God (edited 08-31-2017).]
Best speakers would be to use component speakers with crossover networks all uses a lot of power. There are brackets online for either 4" round speakers or 6 x 9 in the dash. Behind Seatbelt is a 4 inch speaker that with a bit of work a speaker with larger magnet can be fitted in its place again mid range component with a tweeter separate. 3-4 way speakers are all fine till someone turns volume up then something wrong with some part of them 3 ways become 2 ways with a crackle etc.
Pioneer TSA 4103. I have compared them to the Kenwoods. The Pioneers seem to have better bass response. One person who rode with me (a fellow Fiero nut) even thought that I had the performance sound / sub.
I still have my stockers in the B-pillars. They don't see any sunlight, so unless they're just blown, they're usually okay. I'm just interested in them for "rear fill" anyway.
[This message has been edited by Raydar (edited 08-31-2017).]
You can find Kicker and others make 4x10 but many are not best speaker they make. Kicker has them in KS series for ~$100 or less but not CS series Pioneer TS-A4103 is even less at many places
Originally posted by E.Furgal: Yup.. taste and type of music has a lot to do with it.. Got to laugh at the reply about them being junk in 2-3 years.. Sorry we have moved past paper cones and foam surrounds.
My Current dash speakers have glue fail at cone/frame joint after only ~4 years. Only reason didn't fail completely is a coax type and tweeter & "cardboard" frame is holding main cone centered.
Many speakers are still made w/ adhesive that fail for heat from sun parking outside. Cone and other parts may be perfect but fail glues where cone attach to metal frame etc and speaker have problems. Dash top temps reach 160+°F very easy, 200°F is not hard in many places and UV often gets thru screen/grill over them too. B/C panel, door mount and others places can get hot but not like dash top speakers.
many will claim have no problem but few look until the speakers are toast and problems are very obvious. I only found the glue problem when broke a grill and replacing that.