Pioneer S-IW691In-Wall Speaker: Individual Drive Unit Testing


Pioneer S-IW691In-Wall Speaker: Individual Drive Unit Testing

A friend of mine ordered the Pioneer S-IW691 Elite® EX Series speakers for his home theater setup and sent one to me because he was curious just how well the individual drivers perform; namely the concentric mid/tweeter.  The same drivers are also used in Pioneer’s in-wall center channel.

The following is taken from Pioneer’s product information page:

Designed around our award winning EX floor-standing platform, the new Elite® EX Series not only redefines the entire architectural category, but also now offers an even more comprehensive solution for the most refined of audiophile tastes.

With an experience that blends seamlessly within any environment, the EX Series offers exceptional sound with all but complete invisibility.

Built with only the finest of hand picked materials, our patented Coherent Source Transducer (CST) driver technology offers every home cinema connoisseur the most enveloping and accurate “sweet spot” available today. To fully appreciate our Elite EX Series speakers, they simply must be experienced to be believed.

The S-IW691 is designed for custom home cinema and the demands of 2 channel critical listening applications. It features a 6 1/2” woven aramid/carbon composite bass driver, a 5 1/2” magnesium midrange and a 1 3/16” ceramic graphite tweeter built into a laminated MDF baffle. Add customizable features like Treble Contour Control and exceptional sound is always at your fingertips.

 

I always am interested in seeing how raw drivers in ‘kits’ like this perform, so let’s get to it…

 

Photos

Entire Unit

IMG_8380

IMG_8401 IMG_8402

Concentric Mid/Tweeter

IMG_8389

IMG_8381

IMG_8386

IMG_8387

Woofer

IMG_8394 IMG_8395 IMG_8396 IMG_8397

Test Results: Tweeter

TweeterSmall Signal Parameters:

Electrical Parameters
Re 4.46 Ohm electrical voice coil resistance at DC
Le 0.03 mH frequency independent part of voice coil inductance
L2 0.022 mH para-inductance of voice coil
R2 0.6 Ohm electrical resistance due to eddy current losses
Cmes 74 µF electrical capacitance representing moving mass
Lces 0.24 mH electrical inductance representing driver compliance
Res 21.99 Ohm resistance due to mechanical losses
fs 1186.9 Hz driver resonance frequency
Loss factors
Qtp 2.067 total Q-factor considering all losses
Qms 12.174 mechanical Q-factor of driver in free air considering Rms only
Qes 2.467 electrical Q-factor of driver in free air considering Re only
Qts 2.051 total Q-factor considering Re and Rms only

tweeter imp

Tweeter Frequency Response:

2.83v @ 1m, 0, 30, and 60 degrees

Note: The strong dip in response shown in the on-axis (black) is likely due to not flush mounting the drive unit (unfortunately, I don’t have the tools on hand to create such a flush mount).

  • Black = 0 Degrees (on-axis)
  • Orange = 30 Degrees
  • Red = 60 Degrees

tweeter 0 30 60

Tweeter Distortion:

Harmonic Distortion at 90dB and 96dB equivalent output:

  • Blue = THD
  • Red = 2nd Order
  • Pink = 3rd Order
  • Green = 4th Order
  • Teal = 5th Order

tweeter HD @ 90

tweeter HD @ 96

Intermodulated distortion and 90dB and 96dB equivalent output:

tweeter IMD @ 90 tweeter IMD @ 96

 

 

 

Test Results: Midrange

Midrange Small Signal Parameters:

Electrical Parameters
Re 4.54 Ohm electrical voice coil resistance at DC
Le 0.227 mH frequency independent part of voice coil inductance
L2 0.326 mH para-inductance of voice coil
R2 4.48 Ohm electrical resistance due to eddy current losses
Cmes 205 µF electrical capacitance representing moving mass
Lces 8.75 mH electrical inductance representing driver compliance
Res 20.1 Ohm resistance due to mechanical losses
fs 119 Hz driver resonance frequency
——————
fm 85.1 Hz resonance frequency of driver with additional mass
Mechanical Parameters
(using add. mass)
Mms 9.213 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 8.413 g mechanical mass of voice coil and diaphragm without air load
Rms 2.241 kg/s mechanical resistance of  total-driver losses
Cms 0.194 mm/N mechanical compliance of driver suspension
Kms 5.15 N/mm mechanical stiffness of driver suspension
Bl 6.712 N/A force factor (Bl product)
Loss factors
Qtp 0.567 total Q-factor considering all losses
Qms 3.073 mechanical Q-factor of driver in free air considering Rms only
Qes 0.693 electrical Q-factor of driver in free air considering Re only
Qts 0.566 total Q-factor considering Re and Rms only
Other Parameters
Vas 1.735 l equivalent air volume of suspension
n0 0.405 % reference efficiency (2 pi-radiation using Re)
Lm 88.28 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom 89.49 dB nominal sensitivity (SPL at 1m for 1W @ Zn)
Sd 79.46 cm² diaphragm area

mid impedance

Midrange Large Signal Parameters:

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% >2.0 mm Displacement limit due to force factor variation
X C @ C min=75% 1.4 mm Displacement limit due to compliance variation
X L @ Z max=10 % >2.0 mm Displacement limit due to inductance variation
X d @ d2=10% 9.6 mm Displacement limit due to IM distortion (Doppler)
Asymmetry (IEC 62458)
Ak -87.89 % Stiffness asymmetry Ak(Xpeak)
Xsym -0.01 mm Symmetry point of Bl(x) at maximal excursion

mid bl mid bl symmetry mid cms mid kms mid kms symmetry mid lx mid li

Midrange Frequency Response:

2.83v @ 1m, 0, 30, and 60 degrees

  • Black = 0 Degrees (on-axis)
  • Red = 30 Degrees
  • Blue = 60 Degrees

mid 0 30 60

 

Midrange Distortion:

Harmonic Distortion at 90dB and 96dB equivalent output:

  • Blue = THD
  • Red = 2nd Order
  • Pink = 3rd Order
  • Green = 4th Order
  • Teal = 5th Order

mid HD @ 90 mid HD @ 96

Intermodulated distortion and 90dB and 96dB equivalent output:

mid IMD @ 90 mid IMD @ 96

 

 

Test Results: Woofer

Woofer Small Signal Parameters:

Electrical Parameters
Re 4.79 Ohm electrical voice coil resistance at DC
Le 0.505 mH frequency independent part of voice coil inductance
L2 0.62 mH para-inductance of voice coil
R2 3.01 Ohm electrical resistance due to eddy current losses
Cmes 541 µF electrical capacitance representing moving mass
Lces 14.5 mH electrical inductance representing driver compliance
Res 24.9 Ohm resistance due to mechanical losses
fs 56.8 Hz driver resonance frequency
——————
fm 42.9 Hz resonance frequency of driver with additional mass
Mechanical Parameters
(using add. mass)
Mms 20.235 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 18.605 g mechanical mass of voice coil and diaphragm without air load
Rms 1.501 kg/s mechanical resistance of  total-driver losses
Cms 0.388 mm/N mechanical compliance of driver suspension
Kms 2.58 N/mm mechanical stiffness of driver suspension
Bl 6.114 N/A force factor (Bl product)
Loss factors
Qtp 0.778 total Q-factor considering all losses
Qms 4.813 mechanical Q-factor of driver in free air considering Rms only
Qes 0.925 electrical Q-factor of driver in free air considering Re only
Qts 0.776 total Q-factor considering Re and Rms only
Other Parameters
Vas 8.9472 l equivalent air volume of suspension
n0 0.171 % reference efficiency (2 pi-radiation using Re)
Lm 84.52 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom 85.5 dB nominal sensitivity (SPL at 1m for 1W @ Zn)
Sd 127.68 cm² diaphragm area

woofer impedance

Woofer Large Signal Testing:

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% >3.2 mm Displacement limit due to force factor variation
X C @ C min=75% 1.7 mm Displacement limit due to compliance variation
X L @ Z max=10 % >3.2 mm Displacement limit due to inductance variation
X d @ d2=10% 19.5 mm Displacement limit due to IM distortion (Doppler)
Asymmetry (IEC 62458)
Ak 64.93 % Stiffness asymmetry Ak(Xpeak)
Xsym 1.82 mm Symmetry point of Bl(x) at maximal excursion

woofer bl woofer bl symmetry woofer cms woofer kms woofer kms symmetry woofer lx woofer li

 

Woofer Frequency Response:

2.83v @ 1m, 0, 30, and 60 degrees

  • Black = 0 Degrees (on-axis)
  • Red = 30 Degrees
  • Blue = 60 Degrees

woofer 0 30 60

Woofer Distortion:

Harmonic Distortion at 90dB and 96dB equivalent output:

  • Blue = THD
  • Red = 2nd Order
  • Pink = 3rd Order
  • Green = 4th Order
  • Teal = 5th Order

woofer hd @ 90Db woofer hd @ 96Db

Intermodulated Distortion at 90dB and 96dB equivalent output:

woofer imd @ 90Dbwoofer imd @ 96Db

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