Bill Fitzmaurice

You won't get a good guitar tone from a bass cab, at least not if you plan to overdrive it. It's tough to beat a Celestion Greenback.

The key word is 'top'. They're made to be used along with a subwoofer. Some are capable enough to replace a bass speaker, but by no means all, and short of trying them you have no way of knowing.

Considering the target audience I'd say the ad is spot on. I'm 75 but I haven't forgotten what got me started doing this when I was 15, and it wasn't trying to impress my parents.

True. Just like a box of chocolates when you mix drivers you never know what you're going to get.

If that's too crude you're too old. 😲

The difference between tens and twelves is slight. Just having the combo up on top of the extension will make the high end more obvious. For that matter putting it on a stand would.

Assuming the Silverado Special is a 2x12 I'd get a 4 ohm 2x12 extension.

That's a hi-fi speaker. The main drawback is it has lower sensitivity than a pro-sound speaker, so it won't go as loud with the same amp.

Tell that to Derek Smalls. ☺️

Pedals are made to go into bass amps. Rack mount pre-amps are made to go into power amps. I'm sure there are exceptions, but the only way to know if any combination is to make sure that the output voltage of the pedal is at least equal to the required voltage to drive the power amp to full output. Unfortunately neither your SPB-1 nor your GSS provide those specs. The impedances aren't the problem, it's the output voltage of the pedal and the input voltage sensitivity of the power amp.

The SBP-1 is a floor pedal, not an active bass, but you're on the right track. Floor pedals by and large are gain configured to drive a full on bass amp, not a power amp.

I drive a BMW. How do I load my gear? Very, very carefully.

Create your own riser. A road case for your cab or combo would work well without needing extra pack space.

What's happening is that the low frequencies from the subs are not directionally locatable, as their wavelengths are too long compared to the distance between your ears. Really. Binaural hearing allows us to triangulate sound source locations only when the wavelengths are short enough so that the ear/brain can detect the difference in the arrival times at the left versus the right ear. That occurs on average above 100Hz. Since we can't tell where the low frequencies are coming from we take the directional cues from their harmonics, which are coming from the tops. This is what allows us to place subwoofers away from the tops, in both live sound and home theater. My HT folded horn sub sits 30cm to my side in my living room, where it does double duty as a table. My mains are 3 meters in front of me. I cannot tell that the sub is next to me, the bass seems to be coming from the mains, even when movie low frequency sound effects are reaching 120dB.

You're getting all the width to the sound field as is possible already. The midrange drivers insure that the upper woofer doesn't go high enough to get beaming from it, bi-amping insures that the lower woofer doesn't go high enough to get beaming from it, and having the midranges vertical insures the widest possible dispersion from them. Plus the tweeter takes over where the midranges start to droop off-axis. The tweeter in the lower box should be shut off.