My in-dash speaker solution
Let me preface this by saying if you plan on installing dual speakers in the stock location of your dash you should just order the 4x10" to dual 3.5" adaptor from Jerry Landes in Texas for $20 and be done with it.
I went the direction I did partly because I had the materials already and partly for technical reasons.
I started with a pair of Boss 3.5" 2-way speakers rated at 200 watts peak/100 watts RMS. Check out the little tweeter. That's a familiar looking shape isn't it? I also had a 4x10" to 3.5" adaptor. These items came from www.hifisoundconnection.com via ebay. (Careful, they gouge on shipping). $20 for speakers and under $5 for the adaptor.
The plastic adaptor (intended for GM vehicles) was not a bolt in as I had assumed. The two mounting holes at either end fall short of the mounts in the a-body dash frame. I also found that the tweeters in the speakers extend above the mounting surface of the speakers by about 3/8". A flat adaptor plate (like the one Jerry sells) would cause the speaker to interfere with the grille in the dash frame. That would require a different adaptor, spacing the speakers away from the plate, or different speakers.
So, I took the original speaker mount, blasted and repainted it. Then took the plastic adaptor and zipped the ends off with my table saw. I sandwiched to two pieces together using matching holes in both the factory mount and plastic plate. Bolted the speakers and we're done. Sandwiching the two got the speaker low enough to not interfere with the dash grille.
Let me preface this by saying if you plan on installing dual speakers in the stock location of your dash you should just order the 4x10" to dual 3.5" adaptor from Jerry Landes in Texas for $20 and be done with it.
I went the direction I did partly because I had the materials already and partly for technical reasons.
I started with a pair of Boss 3.5" 2-way speakers rated at 200 watts peak/100 watts RMS. Check out the little tweeter. That's a familiar looking shape isn't it? I also had a 4x10" to 3.5" adaptor. These items came from www.hifisoundconnection.com via ebay. (Careful, they gouge on shipping). $20 for speakers and under $5 for the adaptor.
The plastic adaptor (intended for GM vehicles) was not a bolt in as I had assumed. The two mounting holes at either end fall short of the mounts in the a-body dash frame. I also found that the tweeters in the speakers extend above the mounting surface of the speakers by about 3/8". A flat adaptor plate (like the one Jerry sells) would cause the speaker to interfere with the grille in the dash frame. That would require a different adaptor, spacing the speakers away from the plate, or different speakers.
So, I took the original speaker mount, blasted and repainted it. Then took the plastic adaptor and zipped the ends off with my table saw. I sandwiched to two pieces together using matching holes in both the factory mount and plastic plate. Bolted the speakers and we're done. Sandwiching the two got the speaker low enough to not interfere with the dash grille.