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ESS AMT-3 replacement woofer candidates

Ok, managed to get the upgrade/experimenting bug. I have a set of these coming tomorrow, and will try to get them installed this weekend. I'm keeping the current woofer caps, but am curious what if any improvement/differences there will be.
Should be interesting working through the woofer holes.
Luckily hot melt goes away easily with isopropyl alcohol!!
 
Note port tubes.. the Dayton ST255-8 days...
There are still there-now short, plugged with a hockey puck.
3Stock Upgrade x Over.JPG
 
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The 33's are the 2 upper caps..
FIY the mid woofer wire had yet to be installed on the mid at this point-that's why it's looped
 
Pete B said:
It is important to use the DCR of the crossover inductor to compute a new effective Qts
in order to get the correct Qtc in the box. Many drivers end up with too low Qtc which
results in a drooping response and a high F 3dB. Some simulators allow you to input
the source resistance to make this adjustment.

Goldwoods have weak motors and I would not use them.

It would be good if you could find a spec for Fc and Qtc with the original woofers in system.
Do you have the T&S parameters for the original woofers?
Do you have the crossover schematic?

You really want an Fc in the low 40s as was done in the LA and AR-3 to get that nice deep
low end punch. I'm looking for something similar to the LA woofer but built on a 10" frame.
Click to expand...

This may have been posted by now, but the ESS 10" woofer specs are still available via Parts Express.

Thiele-Small Parameters
  • Resonant Frequency (Fs)27 Hz
  • DC Resistance (Re)3.4 ohms
  • Voice Coil Inductance (Le)1.2 mH
  • Mechanical Q (Qms)4.1
  • Electromagnetic Q (Qes)0.54
  • Total Q (Qts)0.48
  • Compliance Equivalent Volume (Vas)1.75 ft.³
  • Maximum Linear Excursion (Xmax)4 mm
Materials of Construction
  • Cone MaterialCoated Paper
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.93 ft.³
  • Sealed F345 Hz
  • Vented Volume2.51 ft.³
  • Vented F322 Hz
 
FIY this pair has the smaller midtube-the
StimpyWan said:
This may have been posted by now, but the ESS 10" woofer specs are still available via Parts Express.

Thiele-Small Parameters
  • Resonant Frequency (Fs)27 Hz
  • DC Resistance (Re)3.4 ohms
  • Voice Coil Inductance (Le)1.2 mH
  • Mechanical Q (Qms)4.1
  • Electromagnetic Q (Qes)0.54
  • Total Q (Qts)0.48
  • Compliance Equivalent Volume (Vas)1.75 ft.³
  • Maximum Linear Excursion (Xmax)4 mm
Materials of Construction
  • Cone MaterialCoated Paper
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.93 ft.³
  • Sealed F345 Hz
  • Vented Volume2.51 ft.³
  • Vented F322 Hz
Click to expand...
The OP is aware of that-the AMT3 uses a 8ohm woofer.
 
StimpyWan said:
This may have been posted by now, but the ESS 10" woofer specs are still available via Parts Express.

Thiele-Small Parameters
  • Resonant Frequency (Fs)27 Hz
  • DC Resistance (Re)3.4 ohms
  • Voice Coil Inductance (Le)1.2 mH
  • Mechanical Q (Qms)4.1
  • Electromagnetic Q (Qes)0.54
  • Total Q (Qts)0.48
  • Compliance Equivalent Volume (Vas)1.75 ft.³
  • Maximum Linear Excursion (Xmax)4 mm
Materials of Construction
  • Cone MaterialCoated Paper
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.93 ft.³
  • Sealed F345 Hz
  • Vented Volume2.51 ft.³
  • Vented F322 Hz
Click to expand...
This ESS 689-1012 truncated frame woofer is NOT the one used in the AMT 3..... If someone has the original 10" stamped woofers and can measure the T&S params, please publish it. Rumor is the Dayton DS250-8 is similar...
 
kwingylee said:
This ESS 689-1012 truncated frame woofer is NOT the one used in the AMT 3..... If someone has the original 10" stamped woofers and can measure the T&S params, please publish it. Rumor is the Dayton DS250-8 is similar...
Click to expand...
Chief has the O.E. woofs
 
If someone can convince him to ship me one woofers-I'll buy the P.E. woofer tester
 
1.16mh of inductor filtering on a 1st order midrange is massive , those mids sound very tame , am i close to correct
 
Opps
Mundorfs
Yes your correct
It’s not really a mid range, but more of a transitional driver
Woofer crosses to the transition driver @250, and to the Heil @700-800hz
12 dB slope
 
Well the kids for the most part are being produced by the Heil... The mid range as you call it is a transitional driver, I think you’re missing the point!!
 
If you read this, this describes why they’re using this driver
It’s not a midrange
It’s a midwoofer
 
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