I downsized from my Hartke Transporter 410 to a Custom Deepend 210 recently as I'm fed up humping the 410 up the stairs when I return from gigs.
I've found I have to have the volume on my Sound City 50+ head at a higher setting to get the volume to sound the same on the 210 as with on the 410.
I assume this is to do with having less speakers? One of our guitarists sets his JCM900 combo on top so it's lower to the ground too for the two gigs I've used with the cab as the venue's don't have much room for seven of us. I'd have liked to have the 210 vertically instead of horizontally.
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https://speakerimpedance.co.uk/?act=two_parallel&page=calculator
But also a bigger cab (especially if the Hartke is one of the ported ones) also add to the extra.
Ultimately though you've halved the amount of things pushing the air. Unless you spend money on a super efficient 2x10 like a Barefaced that has some of the most efficient drivers around you are not going to get the same SPL.
Vertically is the way to go though - you'll get more lateral spread. Tilt it back a bit too so you can hear it better.
Or get another 2x10 and stack them both vertically.
I'd sell the lot and get the Barefaced Two10 though.
https://speakerimpedance.co.uk/?act=two_parallel&page=calculator
I've always found that a lower-powered amp and a big, efficient cab fills a room much better than a higher-powered amp and a smaller, less efficient cab irrespective of the apparent volume in front of the cab too - even more than the dB difference. Which is annoying, because small, lightweight, high-powered amps and small cabinets are a lot easier to carry than old-school low-powered amps and cabs the size and weight of a fridge... but it is the way it is, generally.
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