Rackmount fx. I got 'em, but....

First off, an 8 space rack is a bit overkill for that amp.

Secondly - if you don't want the rack gear, sell it all separately and get triple your money back, at least. Then sell the rack and get a 4 space.

Thirdly - I agree the Furman is a nice piece of gear for a rack system (only one power switch and one plug) - but a good power strip works just the same.

Fourthly - The only other 'worthy' piece of gear might be the DBX compressor.

Fifthly - if you were to use everything (why?) - toss it all in the effects loop and turn the Behringer stuff off. You don't need a 4 channel noise gate with a single-channel system. The Midiverb 2 is OLD tech, and unless you're really into midi-controlled reverb and modulation effects, you won't use it. The 31 band EQ isn't really necessary if you like the onboard EQ of the Ampeg. The BBE Sonic Max is really just a mid-cutting deception. I don't know what the Drive Rack is, but sounds like it drives your rack...which the equipment in the rack doesn't need.

Sixthly - I was serious about selling all of that stuff. $50 for each piece of gear, and you'd get $400 (including the furman and rack), then get a suitable, smaller rack for just the head. And thank your buddy for handing you $275. (but be smart and research the going rates for each piece and sell accordingly)

 

while it might be snake oil, I used a sonic maximizer in my guitar rack back in the day and I thought it was great, but then again I was 90% of the time trying to get a crispy metal tone. On bass, I wouldn't assume it'd do much, might add some sansamp type bite.

Generally, though, I agree with @Mo'Phat above. Deal of the day for you, brother.

 

I'd sell most of that stuff too, and turn the money around into one or two better units. Particularly the dbx 266, if you just upgrade to the next level up from that model (166) you'd be happier.

Most rack processors are meant to go in the fx loop. That includes the little Driverack unit; in a PA setting, it would be placed between the mixer and the power amp, which is basically the same thing as using the fx loop on a head. The BBE is meant to go in the very last position in the loop, so that any phase alterations it does are not "undone" by other processors after it.

 

If you got all that for $125 that is a pretty good deal. I agree with the concensus to spin off the Behringer and the 266.
OTOH the MidiVerb II while a bit long in the tooth is still a good sounding processor with some nice chorus and flanger sounds available, the only downside is that they are all 16 bit and preset, but the presets are well done.
The dbx Go Rack is a decent little processor handy for all sorts of things and might just do the trick for compression with your Ampeg. I have mine mounted to a rack tray with velcro to use with my small PA.

 

1. Adds convenience, but that's about it. Keep it just for the sake of having a rackmount powerstrip.
2. Sell this junk. It's just a mid scoop. The knobs are just bass and treble boost. There's also no true bypass with it, so if it's in your chain and off, it's cutting out a lot of low end.
3. If you like compression, keep it. Myself, I like a dirty tone, so I'd just use the dirt from high gain settings of the 3Pro for all the compression I need. Like most rackmount effects, it's meant to go in the effects loop of your amp.
4. Do you really see yourself using this? How do you trigger a rackmount reverb off and on?
5. Unnecessary, especially considering your setup is single channel. Use a tuner pedal to mute.
6. Unless you find yourself really needing more EQ than the Ampeg offers, I don't see much use for this either.
7. If you find yourself using it, keep it. Otherwise, sell it.

 

Why not get another 115 if you like the one you have?

 

Neither is a very good paring with a 410.

 

Best results, pair with a second 410HE. People who say to pair with a 15 are "hearing with their eyes", thinking a 15 must have more low end; or thinking the extra lows they hear comes from the 15 when more likely it comes from stacking speakers up higher closer to their ears.

Edit, I just re-read where you currently have a 15 and were thinking about adding a 410; in that case, consider adding a second 15 instead. Or keep the 15 for practice, and get a 610 or something like that for gigs.