DMZ 36th vs SD 59 bridge pups?

[freefrog]

Re: DMZ 36th vs SD 59 bridge pups?

Since no data was presented for each individual coil of the 36th, maybe gimmieinfo can giveusinfo on the DCR of each coil. While (near) identical measurements won't rule out a dual resonance design that could be made from the same length of wire of the same gauge (e.g.: different insulation or wind pattern), a significant difference would certainly confirm it.

All that's needed is a multimeter to measure the resistance.

I've never evoked a dual resonance design: I've said that a 36th produces a dual resonant peak.

It's the case with many models IME (including various Duncan pickups), and for other reasons that the gauges of wire used.

 

[Teleplayer]

Re: DMZ 36th vs SD 59 bridge pups?

I've never evoked a dual resonance design: I've said that a 36th produces a dual resonant peak.

In what way did you discover the dual resonance peak? Are you talking about impedance measurement at the pickup terminals, or do you need introduce some external magnetic field?

 

[eclecticsynergy]

Re: DMZ 36th vs SD 59 bridge pups?

I think freefrog may have been referring to dual peaks in the sound, rather than electronic measurement.

 

[freefrog]

Re: DMZ 36th vs SD 59 bridge pups?

In what way did you discover the dual resonance peak? Are you talking about impedance measurement at the pickup terminals, or do you need introduce some external magnetic field?

I was talking about resonant peaks obtained with an ultra low impedance air coil exciter. Maybe Ill share some charts about that if time permits (although I hesitate because posting such screenshots asks me some work but often receives some destructive comment(s) for only reward).

And to echo wht eclecticsynergy says: such resonant peaks obtained thx to an induced magnetic field can be seen too in the frequency analysis of the pickups when they are played clean, plugged direct to the board.

 

[Teleplayer]

Re: DMZ 36th vs SD 59 bridge pups?

I was talking about resonant peaks obtained with an ultra low impedance air coil exciter. Maybe Ill share some charts about that if time permits (although I hesitate because posting such screenshots asks me some work but often receives some destructive comment(s) for only reward).

And to echo wht eclecticsynergy says: such resonant peaks obtained thx to an induced magnetic field can be seen too in the frequency analysis of the pickups when they are played clean, plugged direct to the board.

I would be grateful if you are able to post something to help visualise this. Its hard for me to grasp how some variation in the specification of each coil will create a dual resonant peaks.

 

[freefrog]

Re: DMZ 36th vs SD 59 bridge pups?

I would be grateful if you are able to post something to help visualise this. Its hard for me to grasp how some variation in the specification of each coil will create a dual resonant peaks.

OK.

Here are the resonant peaks produced by two pickups with symetrical coils:




There's slight differences of Q factors due to the screw poles but nothing drastic to notice.


And here are the resonant peaks produced by two DiMarzio 36th (white and blue lines showing the resonance of each coil in the bridge pickup, while the light blue and orange lines show the resonance of each coil in the neck transducer):



Please, keep in mind that these pickups haven't been tested with the same resistive and capacitive loads.

Regarding the reasons behind these differences... Some required explanations would largely exceed the free time that I'm able to spend in such posts, at least for the moment. Thx for your understanding.

 

[gregory]

Re: DMZ 36th vs SD 59 bridge pups?

How much above 7k really matters? That's the area normally associated with air/glass.

 

[Teleplayer]

Re: DMZ 36th vs SD 59 bridge pups?

Please, keep in mind that these pickups haven't been tested with the same resistive and capacitive loads.

Regarding the reasons behind these differences... Some required explanations would largely exceed the free time that I'm able to spend in such posts, at least for the moment. Thx for your understanding.

Thanks very much for showing that. For me its a case of more questions than answers, but its great to get a picture of what you were writing about. What is missing is the combined output of the two coils wired in series.

 

[freefrog]

Re: DMZ 36th vs SD 59 bridge pups?

How much above 7k really matters? That's the area normally associated with air/glass.

Glass can certainly be painful for ears when it's screeching.

I've worked once on a prototype of pickup whose secondary resonant peak was @ 11khz.

Even through the narrowed frequency response of a guitar cab, its tone was awful: high harmonics sounded like tinnitus in clean mode and like a shaked aluminiium foil under distortion.

Such "nuances" might appear as causing "no difference" but are precisely what makes models like DiMarzio Area's potentially artificial sounding and unpleasant to hear, IME and IMHO.