Puritan vs IsoTek vs inakustik

I found in relative esoteric comparisons the place to start is with AI. 

Here’s how these three tend to differ sonically (all system-dependent, of course):

IsoTek V5 Titan (high-current conditioner for amps/subs)

Feel: punchy, dynamic, “unclamped.” Often adds bass grip/weight while keeping transient slam intact.

Why: it’s purpose-built for big current delivery (3 high-current outlets; massive surge protection), so amps don’t sound choked. Many listeners note extra kick in the mid-bass and a cleaner floor without dulling leading edges. (IsoTek, Alpha Audio, Music Direct, Facebook)

Puritan (top tier: PSM156 / PSM1512)

Feel: blacker backgrounds, smoother/“sweeter” mids, and a calmer treble; can read a touch warmer and more relaxed.

Why: extensive multi-stage filtering and DC blocking across many individually filtered outlets. Fans praise hum/noise removal and a more liquid presentation; a few reviews found the effect system-dependent—stellar in some rigs, less so in others. (PSM1512 is a 12-outlet expansion of 156 with the same sonic aim.) (6moons, The Audiophile Man, Steve Huff Hi-Fi, Alpha Audio, AudioVision San Francisco)

inakustik Reference Power Station AC-4500P

Feel: very clean, fast, and transparent; tighter, quicker bass and a focused, deep soundstage—often perceived as leaner/clearer vs. Puritan’s warmth.

Why: high-current parallel filtration and low-resistance busbars aim to avoid current limiting; several evaluations noted better bass control and spatial focus, even compared directly to Puritan’s 1512. (Stereo Times -, Small Green Computer, Mono and Stereo)

Quick pick guide

Want maximum slam & zero dynamic constriction on power amps? IsoTek V5 Titan on the amps, with a separate unit for sources if needed. (IsoTek)

System a bit edgy/bright and you crave ease and “inkier” silence? Puritan PSM156/1512. (6moons, The Audiophile Man)

System already warm/rich and you want speed, clarity, stage focus, and taut bass? inakustik AC-4500P. (Stereo Times -)

Setup notes that affect the sound

Keep high-current amps on high-current outlets (IsoTek Titan or inakustik do well here); put sources on the multi-filter banks (Puritan excels). (IsoTek, AudioVision San Francisco)

Expect room and power quality to swing results; the same unit can sound transformative in one system and subtle in another. (Alpha Audio)

If you tell me your system (amp/speakers, room size, what you’re hoping to change), I’ll tailor a recommendation and ideal outlet layout.

If you have your amplifier plugged in to IsoTek start with trying the amp plugged into the wall directly. Keep the isotek for source components only. I would even plug the ARC preamp directly into the wall as well. Try it. 
If you insist on using power conditioner I’d give Shunyata a try. Bypass puritan. Not good at all. TOL Audioquest is worth trying as well. But again the amp and preamp most likely don’t need power conditioning. Especially if on dedicated circuit. 

Thoughts about using Equitech balanced power?  I assume it would be the same good for sources but avoid amplifiers, preamps.

I have used Equitech 2Q with excellent results, both pre & power (200 amp). Benefit for both. Absolutely no power limiting, feels like the opposite. I have measured my power use in the amplifier. Never above 5/6 watts :)  I enjoy classical, chamber, solo instrument, jazz-- and of course older rock :) 

I had the Puritan and now have a PS Audio P15.  The Puritan had a subtle negative effect on my system, I loaned it to a friend and he had the same experience. I ran it for a a couple months and it was a breath of fresh air when I removed it.
 

The effect of the P15 was a subtle improvement across the board. What it gives me is consistent sound any time, day or night. What I call Sunday night sound, now 24/7. I have two direct lines to my breaker box, and pretty clean power to start with I think. For someone living in a noisy power zone, I suspect it would make a significant difference. I ran my power amp through it for a couple months, but switching it directly to the wall was an improvement. Everything else has benefited from the P15.