I use a Furman 20 amp power sequencer that has programmable with multiple adjustable delay switched outlets and low voltage trigger out connections too..
It`s low volt trigger talks to my 240 volt converted purchased in 2003, MC1201`s & a trigger capable 1991 Niles brand 120 volt switched outlet box for my 2 Crown D150 rear and side surround amps..
The 4 MC 275`s, Integra A/V preamp. and other low power ancillary equipment, like my digital 3 way crossover, are all powered by the Furman via it`s programmable delay 120 volt outlets, all this power up/down is set in motion, via turning a key on the front panel of the rack mount Furman...
And since, I have very stiff dedicated 120/240 volt circuits for all but the Crowns, when the system is turned on the LED lighting in my living room, only faintly flickers/dips when the 2 MC 1201`s are energized, the MC 275`s are somewhat soft start, though..
I have been running this Furman power up/down setup for around six years or so, with no thumps or hum, in either powering up or shut down..
I think it sound`s neat, hearing those high current rated relays clunking, in timed sequence when tuning on, then off..
My prior setup, was more manual like, but I, as I get older, I`ve come to appreciate, and like my "turn key" setup, and that Furman unit is built like a brick $hit house, and a most worthwhile investment, IMHO/E..
In my bedroom system, I have my Mac C 220`s trigger a specially ordered, from my A/V dealer in 2003, a 20 amp 120 volt Panamax surge/spike protector that power`s up/down 2 Mac120 volt wired, also 2003 purchased, MC 1201`s, 2 Velodyne ULD 15 400 watt powered subwoofer`s, and a Yamaha dual 1/3rd octave equalizer.
And even though the subwoofer amps make a mild thump when powered up, but they do that anyway, even when manually switched on, so it`s an non issue for me..
Even though that system is powered via 12 gage 20 amp 120 v dedicated circuit, those MC 1201`s will still flicker my bedroom over head LED lights when the Panamax`s heavy duty time delay relay powers them up.
BTW. FWIW. both the Furman and Panamax`s outlet`s switching relay`s have very high quality "snubbers" across their contacts..
Take care.
Have great spring weekend folks.
Regards, OKB