[DC Audio t/s parameters]

Website doesn't show. I have saved the old specs for a m3? I believe. Hopefully it helps.

 

Here are the specs I have:

18"
Mounting Depth11.5"
Mounting Hole Diameter16.75"
Outside Driver Diameter18.5"
Motor Width9.84"
Weight85lbs
VC Diameter4"
Displacement.26³ ft
Magnet Weight80lbs
Power Handling RMS/Peak4500/9000
Impedance (Ohm)D.7/D1/D1.4/D2
Sd1217cm²
Vas67.02 liters
Cms0.0325mm/n
Mms588.52g
Fs36.4
BL36.25
Re4.02 Ohm
Le7.5mH
Qms22.43
Qes0.416
Qts0.409
Xmax31.25 mm
Ref SPL @ 1 watt90.7dB
Suggested SealedN/A
Suggested Ported 6³ ft
 

[Epicenter with taramps md8000.1]

I run 4v pre outs to my taramps MD8000.1. I think it was the HD models that didn't like higher voltage, but not sure.

[Best sundown amp for two sa15's]

SALT-12

[Prepping doors for second skin]

I use whatever I have on hand. Mostly window cleaner. I'm sure alcohol is much better though. I'm sure it'll stick good no matter what you use, as long as it's clean.

[New Improved SMD Terminal X premium speaker box terminal cup]

Now these are some beefy terminal cups. Good stuff.

[Dd1 help]

The dd-1 wont make anything louder. It only allows you to set your gains correctly. If the music you listen to is -7.5db then I would set it using the -5db track. That should give you 2.5db of headroom. If you just want it as loud as possible set it with the -10db and just be careful in the upper limits of your volume. Another option would br to download a -7.5db track and use that to set it. 

[Constant Distortion on 40hz only]

You need to put the dd1 on the output of the amp. Since its a self powered unit you'll have to take it apart to get at it. Not worth it imo for such a simple setup. This may be the one time I say tune it by ear.