BMT frequncies

Inflames626

New member
Hey guys,
What are the approximate frequencies SD uses for their BMT designations? I find relying on the BMT numbers to be a mixed bag, at best.

For me, when mixing, I find about 0-400 to be lows, 400-1000 to be low mids, 1000-3000 to be upper mids, and 3000-7000 to be highs.

Yet I feel like if I get an SD pickup that emphasizes what they consider mids, I'm getting largely unusable lows and low mids.

To put this further in context, the following is my experience with the BMT system.

Note: all below is opinion. Haters need not comment.

For years and years, I used EMGs and more recently Blackouts, because I found them tighter and more consistent than passive pickups. The Blackouts especially are the single best pickup set I have ever used. Thank you, Seymour Duncan.

A few years ago, I got into standard tuned Marshall type tones with complex mids. Think Guns n Roses or The Cult. I began to use passive pickups for this purpose with more success than with actives. Normally, I use import Jacksons--alder, maple/rosewood bolt on, licensed Floyds.

However, I found myself in the minority of what most SD users seem to like. I am highly critical of the JB, the Distortion, and the Alternative 8, to name a few. I find these pickups to be muddy/boxy, shrill, and gritty, respectively. Meanwhile, I absolutely love the Full Shred set, which is somewhat obscure compared to their more popular lines.

I'm not sure why the popular lines are popular, given that, very generally, I find most SD pickups to be overwound with too much of an emphasis on lows and low mids. This also goes for their Basslines P Bass pickup, which is extremely bassy and hot. Going back to a vintage P felt much more balanced even though I play metal.

The result of all this is a tendency toward scratchiness and a lot of mud in the low end. I also think you lose dynamics and touch with hotter wound pickups.

I don't think it's because these pickups are "too heavy" or "too aggressive" for me. I'm a death metaller. But I prefer to have the control and clarity of something like the Full Shred and to let the amp do the work, not the pickup, because it's hard to dial the grit out of a hot pickup, but you can easily saturate an amp pre. I've done it to compensate for a vintage pickup like a Gibson Classic + in the bridge and I had pretty good results. Meanwhile, I couldn't tame an Alt 8 backed all the way into the cavity with very conservative amp settings.

Note that this is not a criticism of the worksmanship of their product, but rather an observation of what I find to be their "default" sound.

Using the Full Shred as a guide, it seems that, for me, anything over 5 on the BMT scale is too much, especially in the B and M.

Further, another of the best pickups I've ever tried, the Gibson 498t, is very similar to the Duncan Custom 5. Or so I've read thread users comment. Yet a lot of people seem to hate the Custom 5 because it lacks mids, which I find strange considering how much I like the 498t.

Much of this will simply be differences in taste, but, in my opinion, things like Invaders are the problem. Is everyone still playing out of very trebly amps with very little preamp distortion? I can understand an Invader through a Fender or Plexi at the time the Invader was designed, but an Engl, Diezel, Mesa, or Rivera?

Of course, taste is why so many pickup lines are made, but I just kept noticing the bassy/overwound thing from model to model until it felt like a pattern, and I thought I'd ask if anyone else has had similar conclusions.

My guess is the emphasis in pickup marketing is whatever is overwound/hot/boosted gets a lot of attention, especially from young metal players, and so pickups are designed to primarily be loud and saturated to create a wall of sound without attention to other tonal characteristics. You know: omg omg omg, it goes to 11!

In my experience, I've never had a problem with too little hotness/volume, save replacing a Gibson Classic 57 in the neck with a Gibson Classic 57+. Doing so cleaned up the muddiness of the 57, and the 57+ was just hot, bright, and saturated enough to balance the 498t. The 498t had a bit more bottom end in the bridge than the 57+, so I went with that (but I also noticed the 498t lacked the 57+'s dynamics and spongy bottom).

Again, this isn't to bash on SD. The Blackouts are still the best I've tried. But the passives to me have been hit or miss. Based on my preferences, it would seem that only the Screamin' Demons would also fit what I like of the older, established lines (that is, not counting the Pegasus/Sentient/Nazgul/Becker and other newer lines and custom shop lines).

Thanks.
 
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Re: BMT frequncies

I'm pretty sure the bass / mid / treb is just the opinions of someone at SD. If the measure were strictly objective and isolate to the pickups themselves, all the pickups would show a spike in the upper mids to treble (3kHz - 9kHz) in accordance with the peak resonance of the pickup. The idea that a pickup is "scooped" in the mids, or has a more bass than mid response, is never strictly true. The guitar physically produces much more bass than mids or trebles, so most pickups are designed to discard a lot of the bass and instead pass along more mids and trebles to the amp, which then reduce the bass and treble even more in order to produce the crunchy electric guitar tone we all know and love. If you've ever plugged a guitar straight into a mixing board, you know how much bass they put out in the nude, and how poorly balanced they sound without some guitar-amp-clothes on. Suffice it to say, the BMT figures are far from being objective, and so defining the frequency ranges for BMT would be pointless.
 
Re: BMT frequncies

I don't use the BMT to compare between 2 manufacturers for example Duncan and Dimarzio. IMO it tells you what to expect between 2 pickups of the same manufacturer. for example a JAZZN and 59N.
 
Re: BMT frequncies

I don't use the BMT to compare between 2 manufacturers for example Duncan and Dimarzio. IMO it tells you what to expect between 2 pickups of the same manufacturer. for example a JAZZN and 59N.

I find SD's numbers useless even for that! For instance, just to pull one crazy example, there is no way in hell a JB - or any humbucker they make for that matter - has a treble rating of 8, rivaling many of their single coils in terms of treble. It's one of the most honky, treble-attenuated humbuckers I've ever played. I'd rate its treble at 4,and the Seth's up around 7, maybe.
 
Re: BMT frequncies

I find SD's numbers useless even for that! For instance, just to pull one crazy example, there is no way in hell a JB - or any humbucker they make for that matter - has a treble rating of 8, rivaling many of their single coils in terms of treble. It's one of the most honky, treble-attenuated humbuckers I've ever played. I'd rate its treble at 4,and the Seth's up around 7, maybe.
Yes agreed I get what you are saying.
 
Re: BMT frequncies

I'm not sure if the pickups are bassy or if they just track the lows slowly. To me the appeal of the JB is it sounds thick and is ideal for chugging 8th notes, but by the time you get to 16th notes at 160 it loses its appeal and I have to use a high pass filter around 100-200 hz and notch out somewhere between 300-500 hz. It's the perfect pickup for a "Paranoid" type riff or for rocking out a Strat. I hear the mid spike in some situations and in some keys but not nearly as much as the sludgy lows.

I have the opposite problem with the Distortion, which sounds more like me than a JB but can sound like an ice pick in the highs. The Alt. 8 sounds similar to the Distortion but just with more bass. I found the Alt. 8s to sound almost exactly like Ola Englund's demo video, which had an audible scratchiness to the pup to the point that it sounded like someone took a graphic EQ and just boosted it to +15 out of mischief. Some people were saying he just didn't dial his tone in right, but I had similar results and I use a boosted JCM800 in Pod Farm.

A few other observations on my part.

The human ear can hear cuts better than boosts, especially at 2-3k. For me the sweet spot for EMG 81s/HZ4s seems to be 2.2khz, while others go as high as 2.5. And of course you'll have your overtones at 1.1 and 4.4. It's hard to tell whether attempts were made during pickup design to boost frequencies (especially with a hotter pickup) or whether frequencies were removed to emphasize others via modifying the components and wind. I'm opting for more removing.

I wouldn't expect a pickup to be as precise tonally as a parametric EQ.

I'm not sure many cheaper/mid level guitars (we're talking, Jackson wise, from the JS to the X series) even have a tone. They have a resonant frequency, but finding it and determining its influence seems problematic to me (the Fender custom shop, according to YouTube, uses the highly scientific method of taking rubber mallets to body blanks).

To my knowledge, maple/rosewood and alder are chosen because they are pretty flat tonally and are cheap to source. This gives these players even more flexibility to change their tone via pickups since the woods won't be a big deal. But, for all my Jacksons, there's not really a tone. Even when I plug in straight, it sounds very flat (but, again, I'm using actives or articulate pickups like Full Shreds). Sometimes I even record them direct or mic'ed to give the impression of a slim acoustic like a Talman mic'ed at the neck.

My only other point of reference is a Hamer Scarab XT, which I love. It's set neck and all mahogany/rosewood. Relative to the Jacksons, it's fuller and louder sounding with a bit brighter top. The Gibsons are in that (I was building a poor man's LP).

I expected mahogany to be bassier. I just imagine a stereotypical Les Paul to be a big slab of bassy, slightly mid scooped tonewood, while the thin 80s shredder Ibanez/ESP/BC Rich/Jackson jobs sound kind of trebly and bright. Oversimplification, but that's how I think of it.

As far as the worst pups I've used, they'd have to be the D Designeds. The original DD's that came in my 2000 Japanese Jackson KV3 were bassy to the point of being unusable, especially in the neck. And guitar itself is lightweight and feels cheap, yet the Full Shreds fit it ideally. Maybe the guitar is easy to overpower with bass, but for everything I've tried the JB in, I've wished the bottom would tighten up.

My guess is that guitar pickups are voiced for what a guitar does best, which is between 2-3khz. Everything else would be wasted and is rolled off. Same with the guitar and bass speakers. Even if it isn't, it's going to be rolled off in the mix, say around 50-100 for the bass and kick, and around 400-1000 for the bass midrange.

To support DreX's point, I did use my frequency analyzer, Voxengo SPAN, to compare a Mick Thomson Blackout in a Jackson Kelly to a regular Blackout in a Jackson Kelly, and the curves are very very similar, despite most people hearing a noticeably higher midrange in the Thomsons. Also, to a lot of people's surprise, EMGs 81s in 18 volts are not that hot...about -6db below the Duncans. They just sound like they cut through because about everything is rolled off except for the 2k area.

20 years ago I kept wondering why I couldn't scream with such a metal pickup like an EMG 81. Then I tried an FS a few years ago and was blown away. Turns out EMGs would be helped if they extended their frequencies a bit higher. But they do sit in a mix well.

That said, what we hear as vast tonal differences are probably minute on the frequency curves.

Maybe I'm just too metal for a JB. A lot of guys in the 80s used it but I'm guessing that was because it was so common. In addition they could tighten up the low end in studio, and in a live situation I doubt people could tell the difference. I just think that, while a JB can do metal, there are better designs. It's a far better hard rock pickup.

The problem is every new metal pickup marketed just seems to be more shrill and overwound. As if a Distortion weren't enough.

A last thing is, for those of us who record, impulse responses and cabinet sims are a huge improvement. You can keep the same amp, settings, guitar, and pickup, change the IR, and it's like night and day. In the ambiguous real world/live gigging, I'm sure pickup changes were often done for the sake of poor mic placement, bad cabinets, and less than ideal rooms making guitarists think that their pickup sucked.
 
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Re: BMT frequncies

A last thing is, for those of us who record, impulse responses and cabinet sims are a huge improvement. You can keep the same amp, settings, guitar, and pickup, change the IR, and it's like night and day. In the ambiguous real world/live gigging, I'm sure pickup changes were often done for the sake of poor mic placement, bad cabinets, and less than ideal rooms making guitarists think that their pickup sucked.

Nailed it.


The problem is every new metal pickup marketed just seems to be more shrill and overwound. As if a Distortion weren't enough.

I think they need to be bright but with lower output. We can add as much saturation as we want, but it does need to cut through. I'm thinking medium output pickups with A9 magnets may be the best for digital recording.
 
Re: BMT frequncies

I agree with you, dominus, although how bright is a good question. I like to think of it as bright but with a low pass filter around 5k to reduce ear fatigue and to make room for cymbals and high overtones from bass.

Funny thing is, if memory serves, one of the brightest and most articulate players I know, and one of my big influences when I was growing up, Warren DiMartini, is known for using a JB. Yet I feel an FS got a lot closer to nailing his tone than a JB or even Distortion. I don't think the FS was out when Ratt was in full stride, but it brings that kind of playing to mind.

I basically just try to take that style of playing and tone, saturate it a little more, detune it, play faster, and call it done.

I recorded a cover of Judas Priest's "Beyond the Realms of Death" about a year or more ago with a "Transamp" Marshall setting through Uberschall cabs in Guitar Rig 4 with a Distortion in the bridge of a Jackson DK2S. I think it's one of my best solos I've ever done tone wise, but I can just hear the ceramic-ness, noise, and scratch of the Distortion in the upper end.

I found that cutting solo EQ curves to a fairly narrow spread helps a lot with the cutting through in a mix.
 
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