Aside from the models, it's absolutely CRITICAL to know what YEAR the amp is that you're getting, or that you liked if you are trying to get that sound again. There have been a number of changes over the years and the amps sound very different from each other even if they are all the same model.
I've made it a bit of a personal mission to try them all out. I've had, in the same room with the same speaker cabinets:
- 2003 Modded 1987X. Upgraded MM OT, single channel but has footswitchable rhythm/lead (both quite gainy, and share the same preamp gain control) and solo boost. This is an original deal from back when Splawn was just a guitar shop that also modded amps in the back at customer request. It's very focused in the mids - super forward and you can't dial it out, and very gainy and punchy in the palm mutes.
- 2005 ProMod. No gears, high and low inputs, comes in a Marshall 1959X box and 4-hole chassis. ProMod was the quad KT88 amp before the Nitro existed, but it's effectively identical to the QuickRod of the same year other than the power tubes. Clean channel is simply a single volume knob. Classic Tone transformers. Much more open sounding than the 2003, not quite as gainy. Kinda like a more traditional, modded 2203 type sound, just a hair more gain and darker than than a 2003. Honestly a really really great amp.
- 2006 QuickRod. Has gears, 3-preamp tubes, offset input jack. Clean channel has 3-band EQ but it is heavily affected by the gain you set on the drive channel. I absolutely adore this amp on 3rd gear with the gain up for metal, but do that and you're restricted to dirty cleans at best. Heyboers.
- 2008 and 2009 QuickRods. Has gears, but 4 preamp tubes, Heyboers. Clean channel has only 2-band EQ but adds a gain control as well as volume, and stays clean regardless of overdrive channel settings unlike the previous model. The overdrive tone on these 2008-2012 amps probably colored the opinion of thousands of players that don't like Splawns. They are MUCH darker, less open sounding. These are the amps that put the words "weird mids" into everyone's mind and Splawn has struggled to shake this reputation forever. These amps sound closer to my 2003 Splawn modded Marshall actually. Nitro came out during this time and was similarly darker/middier sounding, but more gain and resonance make it bassier too.
- 2015 Nitro. Essentially a Quickrod if it were always in "4th gear," gives up gears for a resonance control. Super saturated, super high gain, sounds great to my ear, very open and cutting. Very different from early Nitros which were much darker and felt more compressed to me. Back to Classic Tone transformers.
- 2018 StreetRod. Basically a baby Quickrod in a combo amp form. Clean channel loses the gain control. Nice and open sounding unlike the 2008-2012 models.
Some I haven't had:
-2005 Quickrod/Promod without gears, but with the 3-band EQ clean channel. There was a VERY short time that these amps existed, in between the high/low input model and the 3-pre gears version.
-Recent QR with the B+/Mid Cut/Old-New switches. I would really like to hear the differences between these switches especially compared to the "real thing" since I have one of the 2006 QR's that supposedly the "old" mode is modeled after.
Here's the short version of my advice: If you buy a Splawn of any model between 2007-2012, expect it to be darker and very middy. If you buy anything earlier than that, you really need to know what you're looking at or play it first because there's a lot of variations. Anything after 2012 is likely the best for most people and has the widest appeal, plenty of gain but more open and clear sounding. If you play a 4-pre 2007-2012 and hate it, I'd really encourage you to try another year because despite the brand name and controls, they may as well be completely different amps. The models are all extremely similar with only minor differences, the year is important.