Count me among the lower-budget audiophiles, one who takes great pleasure in continuously tweaking my sub-$5,000 system to get the best out of it for not alot of money, and enjoying my music collection through it. Every small tweak in cables, mostly, has resulted in a very recognizable and positive increase in sound performance (to my ear; my wife is even hearing the same audible differences and articulating them in her own terms with no prompting or suggestions by me). I just replaced my DIY Moonshine/White Lightning speaker cables with straight-up 12 gauge, single conductor THHN speaker cables (sheathed in Techflex and a pair of cable pants; no twisting, braiding, etc.) with bare wire going to the amp binding posts and speaker inputs. Wow. I thought the Moonshine cables were a step up from the 16 gauge zip cord I started with!
I replaced my modded Hafler DH-220 amp with a B&K EX-442 Sonata a couple years ago, and THAT was a substantial increase in performance. The Hafler was good (itself a nice upgrade over the Adcom GFA6000 it replaced) but the extra 100 watts or so into 4 ohms delivered by the 442 really perks up the Maggies. My 2-channel listening rig:
Parasound P5 preamp
Oppo BDP-93 used as CD transport or Pandora streaming source
Denon DVD-2900 used as a CD transport
B&K EX-442 Sonata 2-channel amp
Magnepan MMG mains
Rhythmik FG12 subwoofer (that, for being only a single sub, integrates VERY nicely with the Maggies, thank you very much)
I now use BLE Design 10 gauge Rhodium Plated power cables for the pre-amp and main amp (very reasonably priced off eBay) which were added a couple months ago. Another great addition that upped the audio revelation. The rest of my gear is powered with standard 16-gauge power cables. My interconnects are a mixture of Monster and Monoprice cables - nothing special, and the the next likely candidates for the next tweak.
With the speaker cable "upgrade" of a couple evenings ago, what was a well-defined, deep and wide soundstage with precise imaging has been fleshed out into a more forward and robust presentation. I detected a small decrease in soundstage depth with the new cables immediately after install, but at the same time, what I presume many would call the "dynamics" of the sound increased. The bass is a bit fuller and tighter (was pretty damned good before), the middle filled in substantially, and I gained height in the soundstage. I may have bought an extra decibel in volume as well. As the cables are burning in, I’ve noted that some of the immediately lost soundstage depth has returned. The overall sound image/presentation is what I would consider to be more cohesive instead of what what I would call the surgically separated sound I had prior. I believe I’m also getting a smidge more detail, though I had what I thought was excellent detail before. My wife said she hears the overall sound presentation "gel" better - it’s really helpful when you can bounce your perceptions off someone who is hearing the same differences you are. I haven’t yet sat to critically listen to most of my reference material other than a few pieces here and there, but so far I’m very pleased with the fit of the cables in my system now that they’re settling in. A completely new sounding system - which sounded pretty fine already - due to a $40 set of DIY speaker cables.
Yeah, I’m enjoying my mid-fi system immensely. I’m here, present, loud and proud.