ScanSpeak Illuminator 18WU/4741T-00 7″ Woofer, 4 ohm


Up for test is the ScanSpeak Illuminator 18WU/4741T-00 7″ Woofer, 4 ohm.  This particular scanspeak woofer has been one of the most impressive midwoofers I’ve tested to date.

340b5d50

Small Signal Testing:

  • Re = 3.2401 ohms
  • Fs = 40.2090 Hz
  • Zmax = 48.9959 ohms
  • Qes = 0.5031
  • Qms = 7.1050
  • Qts = 0.4699
  • Le = 0.2073 mH (at 1 kHz)
  • Diam = 137.1600 mm ( 5.4000 in )
  • Sd =14775.5910 mm^2( 22.9022 in^2)
  • Vas = 29.5769 L ( 1.0445 ft^3)
  • BL = 5.1700 N/A
  • Mms = 16.4284 g
  • Cms = 953.6699 uM/N
  • Kms = 1048.5808 N/M
  • Rms = 0.5842 R mechanical
  • Efficiency = 0.3591 %
  • Sensitivity= 87.5700 dB @1W/1m
  • Sensitivity= 91.4953 dB @2.83Vrms/1m

Scanspeak18wuImpTS

 

Large Signal LSI Klippel Testing:

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% 11.6 mm Displacement limit due to force factor variation
X C @ C min=75% 9.1 mm Displacement limit due to compliance variation
X L @ Z max=10 % 12.6 mm Displacement limit due to inductance variation
X d @ d2=10% 37.1 mm Displacement limit due to IM distortion (Doppler)

This driver is flat out unreal. The symmetry is almost perfect for a stroke of it’s size, and the most limiting xmax is 9.2mm. Bl is 11.9mm.
The Cms curve is nearly perfectly symmetrical. Bl has a small shift.

img_BlX img_KmsX img_LX

Frequency Response and Harmonic Distortion Results:

 Scanspeak18wuFRHDSTDScanspeak18wuFRHD102

Bose 10″ OEM Woofer


The driver is a 10″ OEM Bose subwoofer which came from a 2008 Cadillac CTS-V ( the year may be off by a couple, but I believe this is the correct year).

 

8e9fe89b 70b6b849 12201852

Small Signal Testing:

  • Re = 0.4625 ohms
  • Fs = 45.6971 Hz
  • Zmax = 2.0756 ohms
  • Qes = 1.2681
  • Qms = 4.4224
  • Qts = 0.9855
  • Le = 0.1834 mH (at 1 kHz)
  • Diam = 215.9000 mm ( 8.5000 in )
  • Sd =36609.6161 mm^2( 56.7450 in^2)
  • Vas = 66.5281 L ( 2.3494 ft^3)
  • BL = 1.9067 N/A
  • Mms = 34.7146 g
  • Cms = 349.4218 uM/N
  • Kms = 2861.8704 N/M
  • Rms = 2.2538 R mechanical
  • Efficiency = 0.4704 %
  • Sensitivity= 88.7426 dB @1W/1m
  • Sensitivity= 101.1220 dB @2.83Vrms/1m

BOSEOEM10inchSubwoofer

 

Large Signal LSI Klippel Testing:

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% 5.3 mm Displacement limit due to force factor variation
X C @ C min=75% 6.8 mm Displacement limit due to compliance variation
X L @ Z max=10 %               3.9 mm Displacement limit due to inductance variation
X d @ d2=10% 25.3 mm Displacement limit due to IM distortion (Doppler)

 img_BlX img_BlSymmetryRange img_KmsX img_KmsSymmetryRange

ScanSpeak Revelator 26W/8867T


Up for test, is the ScanSpeak Revelator 26W/8867T Aluminum Cone 10″ Woofer.

IMG_8818 IMG_8819

Small Signal Analysis

Electrical Parameters
Re 6.08 Ohm electrical voice coil resistance at DC
Le 0.296 mH frequency independent part of voice coil inductance
L2 0.299 mH para-inductance of voice coil
R2 2.88 Ohm electrical resistance due to eddy current losses
Cmes 533 µF electrical capacitance representing moving mass
Lces 55.99 mH electrical inductance representing driver compliance
Res 91.54 Ohm resistance due to mechanical losses
fs 29.1 Hz driver resonance frequency
——————
fm 23.6 Hz resonance frequency of driver with additional mass
Mechanical Parameters
(using add. mass)
Mms 52.776 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 46.307 g mechanical mass of voice coil and diaphragm without air load
Rms 1.081 kg/s mechanical resistance of  total-driver losses
Cms 0.566 mm/N mechanical compliance of driver suspension
Kms 1.77 N/mm mechanical stiffness of driver suspension
Bl 9.949 N/A force factor (Bl product)
Loss factors
Qtp 0.556 total Q-factor considering all losses
Qms 8.934 mechanical Q-factor of driver in free air considering Rms only
Qes 0.593 electrical Q-factor of driver in free air considering Re only
Qts 0.556 total Q-factor considering Re and Rms only
Other Parameters
Vas 81.9789 l equivalent air volume of suspension
n0 0.328 % reference efficiency (2 pi-radiation using Re)
Lm 87.36 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom 88.56 dB nominal sensitivity (SPL at 1m for 1W @ Zn)

ScanSpeak Revelator 26W8867T impedance

Large Signal Analysis

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% 9.8 mm Displacement limit due to force factor variation
X C @ C min=75% 11.7 mm Displacement limit due to compliance variation
X L @ Z max=10 % >12.8 mm Displacement limit due to inductance variation
X d @ d2=10% 42.1 mm Displacement limit due to IM distortion (Doppler)

Force factor Bl (X) Bl Symmetry Range Mechanical compliance Cms (X) Stiffness of suspension Kms (X) Kms Symmetry Range Electrical inductance L(X, I=0) Inductance over current L(X=0, I) Total loss factor Qts (X) Resonance frequency fs (X) Mechanical loss factor Qms (X) Electrical loss factor Qes (X)

GTG Sampler Disc Track List

Track Title Artist Album Length
1 End Of The Road (Live) Babyface MTV Unplugged NYC 1997 2:02
2 We Didn’t Start the Fire Billy Joel Storm Front 1:26
3 Turtle Shoes Bobby McFerrin Spontaneous Inventions 0:53
4 Don’t Worry Be Happy Bobby McFerrin The Story of Jazz 1:25
5 Peace of Mind Boston Boston (Original U.S.) 1:05
6 Drive The Cars The 80’s Greatest 1:07
7 Got A Hold On Me Christine McVie Christine McVie 1:04
8 Mr. Jones Counting Crows August and Everything After [MFSL UDCD 664] 1:40
9 Ants Marching Dave Matthews Band Under The Table And Dreaming 1:18
10 Rock Of Ages Def Leppard Pyromania (MFSL Ultradisc II Gold CD 520 0689) 1:09
11 Enjoy The Silence Depeche Mode Best Of Depeche Mode, Vol. 1 1:04
12 Money For Nothing Dire Straits Brothers In Arms 1:36
13 The Boys Of Summer Don Henley Building The Perfect Beast (MFSL) 1:17
14 Let’s Groove Tonight Earth, Wind, & Fire Greatest Hits 1:02
15 In The Ghetto Elvis Presley The Complete Elvis Presley Masters (Disc 18) 1:14
16 The Chain Fleetwood Mac Rumours 1:22
17 Sweet Child O’ Mine Guns N Roses Appetite For Destruction MFSL 0:46
18 You Make My Dreams Hall & Oates Voices (MFSL Gold Japan UDCD 530) 0:58
19 Never Heart Heart (MFSL) 1:24
20 No One Is To Blame Howard Jones The Platinum Collection 1:26
21 Aqueous Transmission Incubus Morning View 1:48
22 Breaking Silence Janis Ian Breaking Silence (Analogue Productions Limited Edition) 1:13
23 Life’s Been Good Joe Walsh But Seriously, Folks… 1:55
24 Rocky Mountain Way Joe Walsh The Smoker You Drink, The Player You Get 1:31
25 Word Up! Korn Greatest Hits Vol. 1 1:06
26 A Place For My Head Linkin Park Hybrid Theory 1:05
27 Grandma’s Hands Livingston Taylor Chesky Records – The Ultimate Demonstration Disc 0:48
28 Live To Tell Madonna True Blue 1:47
29 He Mele No Lilo Mark Keali’i Ho’omalu and Kamehameha Schools Children’s Chorus Lilo And Stitch 1:24
30 Early Bird Mark Knopfler Get Lucky 1:24
31 Remember The Time Michael Jackson Dangerous 1:12
32 Black Or White Michael Jackson HIStory: Past, Present And Future, Book 1 [Disc 1] 1:05
33 Kickstart My Heart Motely Crue Greatest Hits 0:59
34 Feel Like Going Home Muddy Waters Folk Singer 1:30
35 Wonder Natalie Merchant Tigerlilly (MFSL) 1:15
36 Perfect Drug Nine Inch Nails Lost Highway Soundtrack 1:05
37 Don’t Know Why Norah Jones Come Away with Me 1:11
38 When Can I See You Again? Owl City Wreck-It Ralph Soundtrack 1:07
39 You Can Call Me Al Paul Simon Graceland 1:00
40 Even Flow Pearl Jam Ten 1:30
41 Jeremy Pearl Jam Ten 1:18
42 Set Me On Fire Pendulum Immersion 1:14
43 This Is the Picture (Excellent Birds) Peter Gabriel So 1:21
44 In The Air Tonight Phil Collins Face Value 1:25
45 Wrapped Around Your Finger The Police Synchronicity 1:10
46 Jerry Was a Race Car Driver Primus They Can’t All Be Zingers 0:30
47 Know Your Enemy Rage Against The Machine Rage Against The Machine 1:37
48 Spanish Harlem Rebecca Pidgeon Chesky Records – The Ultimate Demonstration Disc 0:38
49 The Race is On Sawyer Brown Greatest Hits 0:53
50 Drum Improvisation Sheffield Labs Sheffield Lab Drum and Track Disc 1:21
51 Superstition Stevie Wonder Greatest Hits 1:07
52 Everybody Wants to Rule the World Tears For Fears Songs from the Big Chair [MFSL Ultradisc] 1:01
53 Africa Toto Legend: The Best Of 1:41
54 Behind The Wall Tracy Chapman Greatest Hits 0:20
55 Owner Of A Lonely Heart Yes Greatest Hits 1:11
56 Sharp Dressed Man ZZ Top Greatest Hits 1:18
57 Warning !!!! Reduce Volume Setup Tracks Iasca 0:19
58 25hz Setup Tracks Pink Noise Tracks 0:14
59 31hz Setup Tracks Pink Noise Tracks 0:14
60 40hz Setup Tracks Pink Noise Tracks 0:15
61 50hz Setup Tracks Pink Noise Tracks 0:12
62 63hz Setup Tracks Pink Noise Tracks 0:14
63 80hz Setup Tracks Pink Noise Tracks 0:13
64 100hz Setup Tracks Pink Noise Tracks 0:14
65 125hz Setup Tracks Pink Noise Tracks 0:14
66 160hz Setup Tracks Pink Noise Tracks 0:13
67 200hz Setup Tracks Pink Noise Tracks 0:14
68 250hz Setup Tracks Pink Noise Tracks 0:14
69 315hz Setup Tracks Pink Noise Tracks 0:14
70 400hz Setup Tracks Pink Noise Tracks 0:14
71 500hz Setup Tracks Pink Noise Tracks 0:13
72 630hz Setup Tracks Pink Noise Tracks 0:14
73 800hz Setup Tracks Pink Noise Tracks 0:14
74 1000hz Setup Tracks Pink Noise Tracks 0:14
75 1250hz Setup Tracks Pink Noise Tracks 0:14
76 1600hz Setup Tracks Pink Noise Tracks 0:14
77 2000hz Setup Tracks Pink Noise Tracks 0:13
78 2500hz Setup Tracks Pink Noise Tracks 0:13
79 3200hz Setup Tracks Pink Noise Tracks 0:14
80 4000hz Setup Tracks Pink Noise Tracks 0:13
81 5000hz Setup Tracks Pink Noise Tracks 0:14
82 6300hz Setup Tracks Pink Noise Tracks 0:14
83 8000hz Setup Tracks Pink Noise Tracks 0:13
84 10000hz Setup Tracks Pink Noise Tracks 0:13
85 12500hz Setup Tracks Pink Noise Tracks 0:14
86 16000hz Setup Tracks Pink Noise Tracks 0:13
87 20000hz Setup Tracks Pink Noise Tracks 0:11
88 center Setup Tracks Setup Disc 0:31
89 left Setup Tracks Setup Disc 0:34
90 left of center Setup Tracks Setup Disc 0:32
91 right Setup Tracks Setup Disc 0:38
92 right of center Setup Tracks Setup Disc 0:35
93 Correlated Pink Noise Setup Tracks Test CD #102 0:30

Pictures from the 2013 Car Audio Championships

The major car audio organizations recently capped off the year with a joint Finals at the VBCC in Huntsville, AL where both sound quality and sound pressure were represented with a combined 250+ (guesstimate) competitors.  If I had to guess, I’d say there was somewhere around 100-120 SQ competitors alone.  An awesome turnout.

Here are some random pictures from the event (with a few at the beginning thrown in from a tweak and tune before the show).  These are all SQ competitors only.  And they really don’t do justice to the number of cars that were actually competing over the weekend.

 

Funkin Audio FASX-380

 

 

 

IMG_6407 IMG_6408 IMG_6409

Up for test is a Funkin Audio FASX-380 15″ Subwoofer.  The sub is a dual 4ohm voice coil, though for this test only one coil was connected.

Thiele-Small Parameters

Electrical Parameters
Re 3.75 Ohm electrical voice coil resistance at DC
Le 0.312 mH frequency independent part of voice coil inductance
L2 1.962 mH para-inductance of voice coil
R2 12.84 Ohm electrical resistance due to eddy current losses
Cmes 1273 µF electrical capacitance representing moving mass
Lces 25.48 mH electrical inductance representing driver compliance
Res 13.25 Ohm resistance due to mechanical losses
fs 27.9 Hz driver resonance frequency
Mechanical Parameters
(using add. mass)
Mms 151.278 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 127.892 g mechanical mass of voice coil and diaphragm without air load
Rms 8.968 kg/s mechanical resistance of  total-driver losses
Cms 0.214 mm/N mechanical compliance of driver suspension
Kms 4.66 N/mm mechanical stiffness of driver suspension
Bl 10.9 N/A force factor (Bl product)
Loss factors
Qtp 0.654 total Q-factor considering all losses
Qms 2.961 mechanical Q-factor of driver in free air considering Rms only
Qes 0.838 electrical Q-factor of driver in free air considering Re only
Qts 0.653 total Q-factor considering Re and Rms only
Other Parameters
Vas 172.4831 l equivalent air volume of suspension
n0 0.432 % reference efficiency (2 pi-radiation using Re)
Lm 88.55 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom Zn missing dB nominal sensitivity (SPL at 1m for 1W @ Zn)
Sd 753.79 cm² diaphragm area

FA FASX-380 Magnitude of electric impedance Z(f)

 

Large Signal Analysis

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=70% 8.4 mm Displacement limit due to force factor variation
X C @ C min=50% >15.7 mm Displacement limit due to compliance variation
X L @ Z max=17 % 12.4 mm Displacement limit due to inductance variation
X d @ d2=10% 48.9 mm Displacement limit due to IM distortion (Doppler)
Asymmetry (IEC 62458)
Ak 47.66 % Stiffness asymmetry Ak(Xpeak)
Xsym 3.13 mm Symmetry point of Bl(x) at maximal excursion

FA FASX-380 Force factor Bl (X) FA FASX-380 Bl Symmetry Range FA FASX-380 Mechanical compliance Cms (X) FA FASX-380 Stiffness of suspension Kms (X) FA FASX-380 Kms Symmetry Range FA FASX-380 Electrical inductance L(X, I=0) FA FASX-380 Inductance over current L(X=0, I)

Airborne FR124B8-19F

The following test is for the Airborne FR124B8-19F which can be purchased from Solen here.  At the time of this test, the MSRP is approximately $51CAD ($50USD).

IMG_6406 IMG_6405

 

 

Thiele-Small Parameters

Electrical Parameters
Re 7.24 Ohm electrical voice coil resistance at DC
Le 0.203 mH frequency independent part of voice coil inductance
L2 0.25 mH para-inductance of voice coil
R2 2.11 Ohm electrical resistance due to eddy current losses
Cmes 208 µF electrical capacitance representing moving mass
Lces 18.19 mH electrical inductance representing driver compliance
Res 65.52 Ohm resistance due to mechanical losses
fs 81.8 Hz driver resonance frequency
——————
fm 53.6 Hz resonance frequency of driver with additional mass
Mechanical Parameters
(using add. mass)
Mms 5.573 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 5.411 g mechanical mass of voice coil and diaphragm without air load
Rms 0.409 kg/s mechanical resistance of  total-driver losses
Cms 0.679 mm/N mechanical compliance of driver suspension
Kms 1.47 N/mm mechanical stiffness of driver suspension
Bl 5.176 N/A force factor (Bl product)
Loss factors
Qtp 0.697 total Q-factor considering all losses
Qms 7.006 mechanical Q-factor of driver in free air considering Rms only
Qes 0.774 electrical Q-factor of driver in free air considering Re only
Qts 0.697 total Q-factor considering Re and Rms only
Other Parameters
Vas 0.7183 l equivalent air volume of suspension
n0 0.049 % reference efficiency (2 pi-radiation using Re)
Lm 79.09 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom Zn missing dB nominal sensitivity (SPL at 1m for 1W @ Zn)
rmse Z 6.39 % root-mean-square fitting error of driver impedance Z(f)
Series resistor 0 Ohm resistance of series resistor
Madd 7.73 g additional mass
Sd 27.34 cm² diaphragm area

Aiborne FR124BB-19F Magnitude of electric impedance Z(f)

Large Signal Parameters

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% 2.4 mm Displacement limit due to force factor variation
X C @ C min=75% 2.8 mm Displacement limit due to compliance variation
X L @ Z max=10 % 3.5 mm Displacement limit due to inductance variation
X d @ d2=10% 14 mm Displacement limit due to IM distortion (Doppler)
Asymmetry (IEC 62458)
Ak -9.27 % Stiffness asymmetry Ak(Xpeak)
Xsym -0.11 mm Symmetry point of Bl(x) at maximal excursion

Airborne FR124B8-19F Force factor Bl (X) Airborne FR124B8-19F Bl Symmetry Range Airborne FR124B8-19F Mechanical compliance Cms (X) Airborne FR124B8-19F Stiffness of suspension Kms (X) Airborne FR124B8-19F Kms Symmetry Range Airborne FR124B8-19F Electrical inductance L(X, I=0) Airborne FR124B8-19F Inductance over current L(X=0, I)

Frequency Response

The following measurement result is a result of merging nearfield response with farfield at 2.83v/1m to illustrate a standard 2.83v/1m measurement.

Airborne FR124B8-19F  0 30 60

 

Harmonic Distortion at 96dB/1m

FR124B8-19F 96dB HD

Airborne FR151B8-22F

The following test is for the Airborne FR151B8-22F which can be purchased from Solen here.  At the time of this test, the MSRP is approximately $69CAD ($67USD).

 

IMG_6401 IMG_6403 IMG_6404

 

Thiele-Small Parameters

Electrical Parameters
Re 6.27 Ohm electrical voice coil resistance at DC
Krm 0.0214 Ohm WRIGHT inductance model
Erm 0.5 WRIGHT inductance model
Kxm 0.0493 Ohm WRIGHT inductance model
Exm 0.39 WRIGHT inductance model
Cmes 353 µF electrical capacitance representing moving mass
Lces 26.44 mH electrical inductance representing driver compliance
Res 62.31 Ohm resistance due to mechanical losses
fs 52.1 Hz driver resonance frequency
——————
fm 32.6 Hz resonance frequency of driver with additional mass
Mechanical Parameters
(using add. mass)
Mms 9.59 g mechanical mass of driver diaphragm assembly including air load and voice coil
Mmd (Sd) 9.217 g mechanical mass of voice coil and diaphragm without air load
Rms 0.436 kg/s mechanical resistance of  total-driver losses
Cms 0.973 mm/N mechanical compliance of driver suspension
Kms 1.03 N/mm mechanical stiffness of driver suspension
Bl 5.212 N/A force factor (Bl product)
Loss factors
Qtp 0.695 total Q-factor considering all losses
Qms 7.2 mechanical Q-factor of driver in free air considering Rms only
Qes 0.725 electrical Q-factor of driver in free air considering Re only
Qts 0.659 total Q-factor considering Re and Rms only
Other Parameters
Vas 3.145 l equivalent air volume of suspension
n0 0.059 % reference efficiency (2 pi-radiation using Re)
Lm 79.91 dB characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom Zn missing dB nominal sensitivity (SPL at 1m for 1W @ Zn)
rmse Z 4.83 % root-mean-square fitting error of driver impedance Z(f)
Series resistor 0 Ohm resistance of series resistor
Madd 15.34 g additional mass
Sd 47.78 cm² diaphragm area

Airborne FR151B8-22F Magnitude of electric impedance Z(f)

Large Signal Analysis

Displacement Limits thresholds can be changed in Processing property page
X Bl @ Bl min=82% 2.8 mm Displacement limit due to force factor variation
X C @ C min=75% 3.7 mm Displacement limit due to compliance variation
X L @ Z max=10 %            >4.6 mm Displacement limit due to inductance variation
X d @ d2=10% 20.2 mm Displacement limit due to IM distortion (Doppler)
Asymmetry (IEC 62458)
Ak -2.28 % Stiffness asymmetry Ak(Xpeak)
Xsym -1.23 mm Symmetry point of Bl(x) at maximal excursion

Airborne FR151B8-22F Force factor Bl (X) Airborne FR151B8-22FBl Symmetry Range Airborne FR151B8-22F Mechanical compliance Cms (X) Airborne FR151B8-22F Stiffness of suspension Kms (X) Airborne FR151B8-22F Kms Symmetry Range Airborne FR151B8-22F Electrical inductance L(X, I=0) Airborne FR151B8-22F Inductance over current L(X=0, I)

Frequency Response

The following measurement result is a result of merging nearfield response with farfield at 2.83v/1m to illustrate a standard 2.83v/1m measurement.

Airborne FR151B8-22F 0 30 60

Harmonic Distortion at 96dB/1m

Airborne FR151B8-22F 96db HD

Rhythmik Audio/GR Research F12G Direct Servo Subwoofer

As a reviewer for hometheatershack.com, I just wrapped up testing on the Rythmik Audio F12G subwoofer and have posted the data here:

http://www.hometheatershack.com/forums/sub-zone-subwoofer-testing/66876-rythmik-audio-gr-research-f12g-direct-servo-subwoofer.html

 

In a nutshell, I was very impressed with with the linear excursion of the SW-12-04 subwoofer driver at just under 18mm.  At the current MSRP of $179 believe it to be a great value.  The subwoofer as a kit (enclosure, amp, and driver) perform very well and have some very nice features most other powered subs do not have.

 

– Erin

Bohlender Graebenar Neo10 Planar Transducer

A fellow on tech-talk sent me four of these drivers to test and check for consistency.  I normally don’t see the need but figured it’d be interesting so I obliged.

I tested each driver’s impedance, frequency response and relative harmonic distortion. I added each driver’s respective result to the same graph for comparison purpose.  I then chose one of the drivers to do further testing on.  So what we have is the typical suite of data plus unit-to-unit comparison data.  I hope you enjoy!

 

IMG_5354 IMG_5359

 

Driver Comparison Testing

Let’s first start with the comparison data. All four drivers were tested in the exact same fashion.  One was tested, then removed from the baffle and the next was added.  The mic never moved and all the impulse responses were windowed to the exact same time(s).  Therefore, the only variant in each test is the driver itself.

Impedance Comparison

As stated above, I received (4) of these drivers to test.  However, I didn’t sweep the first driver sample for impedance so there are only (3) samples in the impedance data.

BG Neo10 - Impedance Comparison

 

Frequency Response Comparison

The comparison testing for FR & HD was done at one-half meter, with 2.83v input signal.  The results on the FR below were each attenuated 6dB in order to provide a normalized 2.83v/1meter response SPL.

This response is in the horizontal plane only.  I did not test repeatability in the vertical plane.

Neo10 Frequency Response Comparison

Harmonic Distortion Comparison

Neo10 - Total Harmonic distortion Comparison

End of Comparison Testing….

———————————————————————————————————————————————

Single Driver Testing:  Sample 3

After completing the comparison testing above, I chose Sample 3 to test further as it seemed to have the better response in FR and HD.  Yes, this is cherry picking but you’ve seen the variance above.

Thiele-Small Parameters

Electrical Parameters
Re 6.28 Ohm electrical voice coil resistance at DC
Le 0.006 mH frequency independent part of voice coil inductance
L2 0.01 mH para-inductance of voice coil
R2 0.29 Ohm electrical resistance due to eddy current losses
Cmes 1264 µF electrical capacitance representing moving mass
Lces 0.77 mH electrical inductance representing driver compliance
Res 1.1 Ohm resistance due to mechanical losses
fs 161.2 Hz driver resonance frequency
Loss factors
Qtp 1.194 total Q-factor considering all losses
Qms 1.403 mechanical Q-factor of driver in free air considering Rms only
Qes 8.032 electrical Q-factor of driver in free air considering Re only
Qts 1.194 total Q-factor considering Re and Rms only

Frequency Response: Horizontal Axis

Neo10 Horizontal Frequency Response 0 30 60

Frequency Response: Vertical Axis

Neo10 Vertical Frequency Response 0 30 60

Harmonic Distortion (Horizontal Axis)

Note the response rises throughout.  Therefore, the SPL level used to determine 96dB/1m was based on the fundamental mean SPL from 300hz to 5khz.  This is the same as I do on all my tests, albeit with some more wiggle room here by a couple dB.  Overall, this is comparable to my other test results.

Fundamental + Harmonic distortion components (96dB1m)

Cumulative Spectral Decay

Neo10 Cumulative spectral decay 2

End