Five-inch RS 40-1284 design & build

[Richard Ellis]

OK, I have a pair of RS 40-1284 five inch FR drivers coming..The experience I've read has them not really suitable to much except an Aperiodic approach.
The TS parameters I could find are Qes, 1.42 Qms, 3.12 Fs, 103 Re, 6.4 Le, 0.36 87Db@1W1M. I have had prior experience with this driver, long long ago...& I believe the Qe to be much better than posted...the magnet assembly being almost as big as the driver basket itself...1.42?, no, I don't think so..
All things considered, I'll do an Aperiodic at 17.839 liters worth. 207.388X261.293X329.203 (inside) mm. I'll stop by a local wood workshop & see what he can do for me..
----------------------------------------------------------------------Rick.........

 

[GM]

Specs depend on where it was made, early ones were Taiwanese, so FWIW:

What is ideal for this driver?

What is ideal for this driver?

GM

 

[Richard Ellis]

All those years ago, I had the early versions...they had Green cones. Now, no doubt with use that green color would fade away to a Gray color...having been exposed to sunlight. The ones which are on the way, are the 40-1284E...the "E" model..which is either a faded (used), or the later versions with the gray color???
The pictures & descriptions seem to be NOS, the terminals seem undisturbed.

----------------------------------------------------------------------------Rick......

 

[GM]

Don't recall an 'E', the 1284 was dropped from the 2002 catalog and when I bought out most of the local stores, RadioShack.com outlet's drivers, there were only ~matte black cone 1284s, which measured closer to the specs you posted, only worse, so they all went into older pickup and larger truck dashboards where more often than not, the windows were rolled down, so high fidelity wasn't a requirement.

The only obviously gray cones I have is the 40-1354.

GM

 

[Richard Ellis]

These ones are Philippine manufacture, I recall Taiwan and Korea versions...
The ones I had were...in 1984 when I was in Electronics school, I scared up a non-working early "Soundstream" car amp...of course I tore into it & oddly found some five or so fuses inside, strange I thought. The insides were oddly well thought out, neat & seemingly almost hand-built, enthusiast layout. If I recall it was rated at a true 20W, RMS output. The RS 40-1284s' I put in the doors with the matching RS plastic grated grilles. The sound was superb...
We shall see if that particular sound car be "re-created" some 30+ years later...

---------------------------------------------------------------------Rick.......

 

[Richard Ellis]

From 1984 catalog showing the green coned version

-------------------------------------------------------------------Rick....