A remaster is not a remix. Drowned vocals are a function of the mix.
While the first sentence is strictly true, the second one isn't.. Different elements in a mix "live" in different areas of the frequency spectrum, and by cutting or boosting via EQ you can absolutely bring things up or down in the mix.
This chart isn't perfect, but it gives you a rough idea of how EQ in different places can affect different instruments and vocals.
Mike Butcher, who did this quad mix along with Spock Wall (an associate of the band who ran their live sound) was a really good engineer, and the man behind the board for the stereo mixes of
Sabbath Bloody Sabbath and
Sabotage, widely considered to be two of the best-sounding (if not the best) in the band's whole catalog.
The quad mix of
Paranoid was done in late 1973 in between these two albums at Morgan Studios Brussels, the same place that some of
Sabotage was recorded, so it doesn't track to me that the two stereo albums would sound great, and the quad mix would have buried vocals. If there was one guy that knew what Sabbath "should" sound like in 1973, it was Mike Butcher.
The thing is, while you can calibrate a tape with tones and so on to make sure the playback on one deck is the same as another, the tonality of a mix isn't something you can legislate for in the same way. The size and shape of a rom, the types of speakers, mixing desk and other equipment (along with a million other variables) can affect what the mix engineer, producer and other people in the room are hearing, and as a result, what the mix put to tape sounds like. If the room you're mixing in has too much treble response, the mix (flat from tape) will have more bass because you'll be inclined to roll it off to compensate from what you're hearing from the speakers. If you want evidence of this listen to the quad mix of the
Best of the Guess Who from the Audio Fidelity - like many of AF's early quad releases, it was basically mastered flat from tape, and it's super murky, thanks to the fact that it was mixed in RCA's studios, which used a type of speakers that had a famously exaggerated treble response above 12kHz. Now you can either compare those quad mixes to the Steve Hoffman-mastered stereo mixes on the same disc, or the Mike Dutton-mastered quad mixes on the various D-V SACDs, and you'll see that 'flat' doesn't equal 'better'. Sabbath themselves were also similarly affected on their 1983
Born Again album - they inadvertently blew some speakers playing back some of the backing tracks, so when it came to mixing the album - and we all know what blown speakers sound like, very little bottom end - and so the mix is super bassy as a result.
Not only were
Sabbath Bloody Sabbath and
Sabotage two of Sabbath's best, they also represented some of their most extensive studio sessions the band had ever undertaken, so I just refused to believe that Butcher - who'd been there for all of that - would simply dash into the studio for a day and reel off something that didn't meet those standards, especially in light of the fact that they sent their live sound man to work with him.
With that belief in mind, I set out to remaster the quad mix of
Paranoid to suit my own tastes, which is to say I wanted it to have the same tonality as the best stereo version. In that pursuit I ended up listening to somewhere north of a dozen different versions of the album, from the '80s Warner US, Castle UK and various Japanese CDs, to the '90s Castle remasters, and through to the Sanctuary/Vertigo Japanese SACD and the 24/96 digital downloads from 2014. While all the stereo masterings present a slightly different take on the material, one thing they all universally agree on compared to the quad is that the quad has too much bass below 300Hz, and too much top end, starting at about 5kHz and escalating upward.
Take, for example, this screenshot of the first track on
Paranoid, War Pigs The pink spectrum is the stereo mix, and the green is the quad mix, and that line through the middle is an EQ curve that illustrates the difference between the two, ie. how to make the quad mix sound like the stereo mix. As you can see the stereo mix has considerably more midrange energy - go back to the Sweetwater frequency spectrum graph and you'll see that the 'presence' band for electric guitar is 1kHz - 3kHz, and the 'presence' band for tenor vocals is 3kHz - 5kHz. Now look at the graph above, and pay particular attention to that combined range (1kHz - 5kHz) and you'll see the stereo mix,(pink waveform) which everyone agrees sounds right, has much more energy in that range, which is why in the stereo mix the guitars and lead vocals aren't 'buried' at all. Conversely, a mastering (or transfer) that has more bass and treble will feature the instruments that live in those frequency bands, which in the case of this album is the bass guitar and bass drum in the low end, and the cymbals and hi-hat in the top end, which is exactly why they're predominant in the on-disc mastering of the Quadio release of this album.
If you have access to a 30-band equalizer, or something that can even replicate roughly the curve it illustrates, give it a try on War Pigs and you'll see that the vocals sit perfectly in the mix, identical to their stereo counterparts. Though every track on the album requires a different EQ, all of them reveal themselves to be similarly well-mixed once properly calibrated with EQ.
It seems to me that we've been fed this line for so many years now (primarily by the humble guy next door who named a forum after himself) that somehow "flat transfers" are better and more pure than something that's been attended to by a mastering engineer. While I'd prefer a flat transfer to one that's been wrecked by heavy-handed EQ or unnecessary dynamic range compression, there's a lot to be said for having a talented and experienced mastering engineer in your pipeline between transfer and authoring, though I know not every reissue budget or timeframe allows for this. For every album that sounds great 'flat' there's another one that needs serious sonic surgery or a real spit-shine to sound its best. I know this for a fact being on the "other side of the glass" from my work with D-V - there are quad mixes where Mike Dutton has had to make serious alterations to what came off the tapes in order to make the album sound the way people expect it to, but oftentimes that work is so "right" that it's transparent to the end listener, which I think is the goal of mastering. A great mastering engineer isn't just a guy with good taste, or a "particular set of skills", he or she is also something of a recording historian - sort of like how Steven Wilson is with regards to vintage remixes - who knows the inherent sonic signature of various studios, mixing desks, engineers, and even tape formulations and speeds and can marry all of that technical and artistic intelligence together when they're making decisions about how a 40 or 50 year old album 'should' most likely sound.