Dome or cone midrange

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#22
profiguy said:
You're basically describing a large nearfield monitor style 3 way, but listened to and balanced for midfield.

Most of the 4 ways I build are actually 3 ways with subs underneath them and 2 x 6" - 8" midbass side by side with the mid and tweeter vertically situated above the MB drivers. I dont cross the MB high enough to start lobing, so they behave as one driver, with the benefits of a few dB sensitivity gain. You don't need a particularly sensitive mid driver for this thanks to overlapping gain of MB and HF. This makes the mid more of a filler driver depending on xover.
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roughly where would you cross your mid to midbass ?
 
#24
Charles Darwin said:
6mm p-p linear, short coil in a long gap ie underhung.
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Nah, I found it, 6 mm P-P is the mechanical limit of the coil travel, not the (linear) xmax, which is +/- 0.75 mm (or 1.5 mm P-P) in strict mathematical term for an underhung motor (magnetic gap length - voice coil length)/2, or maybe a little more in the real world as specified by some manufacturers.

ATC_SM75-150(S)_spec.jpg
 
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#26
YSDR said:
Nah, I found it, 6 mm P-P is the mechanical limit of the coil travel, not the (linear) xmax, which is +/- 0.75 mm (or 1.5 mm P-P) in strict mathematical term for an underhung motor (magnetic gap length - voice coil length)/2, or maybe a little more in the real world as specified by some manufacturers.

View attachment 1216064
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I used Jeff Bagby's review of that driver here: ATC75-150S_JeffBagby.pdf
 
#28
On paper, that’s a very nice mid dome!

I’m pretty sure one can acquire the ATC dome as a repair part through any of their authorized dealers.

Even though I have such a strong feeling on the performance of dome mids, I don’t think I could or would ever advocate for anyone spending $800 for a single driver if value vs performance were part of the plan…….it’s just NOT going to sound 4-5x better than the next best thing. But if one does have the finances to spare, I strongly suggest picking up a pair. I’ve been behind the console in a few studios over the years with ATC mid field monitors and let’s just say it’s something you don’t forget……. could’ve been the SSL4000 though honestly.
 
#30
jccart said:
roughly where would you cross your mid to midbass ?
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Used in a 3 way, I usually cross the SS D7608 around 800 3rd order and use a custom critically dampened rear chamber, which eeks out a bit more low mid output capacity.

In a 4 way I cross it around 900 - 1000 2nd - 3rd order. It will cope with 110 dB peaks in this configuration. The SS mid can deal with alot of electrical input but has less xmax than most large domes. Any limits are generally set by Fs.

The ATC dome isn't perfect either, but it deals with more mechanical abuse and sounds fairly graceful exceeding the limits. It doesn't quite keep up with a pro 15" at severe levels. It will do well with anything under 110 dB which is more than enough in most cases.
 
#35
The Fane 5" driver mentioned by @fabricadetabaco caught my attention... I have been looking at a lot of 5" drivers recently.

FANE Studio 5FRK

1695478726760.png

1695478751177.png


The -5 dB dip from 800 - 1100 Hz, coupled with the big impedance blip at 850 Hz, makes this driver less desirable for serious listening application. This kind of defect is probably not important in a live sound reinforcement application, where power handling, SPL output, and durability are the primary requirements. I can't see using this in a near field or mid field monitor, or in a serious home listening system.

j.
 
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#39
hifijim said:
The Fane 5" driver mentioned by @fabricadetabaco caught my attention... I have been looking at a lot of 5" drivers recently.

FANE Studio 5FRK

View attachment 1216189
View attachment 1216190

The -5 dB dip from 800 - 1100 Hz, coupled with the big impedance blip at 850 Hz, makes this driver less desirable for serious listening application. This kind of defect is probably not important in a live sound reinforcement application, where power handling, SPL output, and durability are the primary requirements. I can't see using this in a near field or mid field monitor, or in a serious home listening system.

j.
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Peak in impedance (850Hz) as well as not a very flat impedance.

Unless you need it for specific reasons, but both are a no-no for me when performance is important.
 
#40
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