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Measurements and compare

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Attention! This site contains unique information on speaker drivers measurements and has a parameters compare feature. For unregistered users this information is available in part. To get a full access you need to register. Sorry fore some inconvenience

About the measurements
The present measurements are performed using MLS (Maximum Length Sequence) technology that allowed to perform the speaker driver measurements from 125Hz up to higher frequencies without a parasitic influence of reflected signals with no need of using an acoustic anechoic chamber. With the aim of getting the maximum reliable and high resolution measurements, especially when measuring harmonic distortion, we use metrologically tested professional equipment of Brüel & Kjær (Denmark) and RFT (Germany) companies. The applying of the acoustic pressure calibrator is allowed to measure the absolute sensitivity of speaker drivers.

Because a considerable part of measurements had being performed during many years and were not determined yet the final approach to their format and content some types and modes are absent in the early measurements.

Measurement setup specification

Test baffle size – 1650x850 mm
Measuring equipment:
- measuring microphone Brüel & Kjær 4133
- microphone preamplifier Brüel & Kjær 2639
- preamplifier power supply Brüel & Kjær 2804
- sound card EMU-0202USB
- DSP Xilica  XM2040
- low THD power amplifier

About compare feature

On the website is realized mechanism that allow to compare visually all of parameters and characteristics of two or three drivers. Compare feature is available for registered users only. Choose the drivers of interest and press “Compare” button in the compare block (this block is located in the right side bar on desktop monitors or under the speaker drivers table on tablet and smartphone displays). After that the compare page will be open and atop of page there will be the speaker drivers tabs. Choose one or another tab and you will see the page of chosen driver parameters and characteristics. You can choose the measurement mode of interest by pressing one of buttons above diagram. These modes will be saved after switching to other tab. All measurements are given at different test voltages for a user be able to choose measurement modes that close by the sound pressure for more correct compare. You can delete any driver from compare block by pressing red X next to the driver model name.

Types and purpose of the measurements

Technical data – the speaker driver parameters from manufacturer official datasheets are listed here

Axial magnitude frequency response – absolute magnitude frequency response on the main acoustic driver axis measured at different test voltages. The measurements are performed  at 315 mm distance from the baffle and the results are recalculated to 1000 mm distance.  Measuring at 315 mm distance allow  to reduce parasitic diffraction effects from the test baffle ends, to increase direct signal to reflected signal ratio and to increase “anechoic measurement window” width. It can be considered that reliable frequency response is displayed  from  200Hz and higher up. Under 200Hz frequency response falling is started due non-endless test baffle size and acoustic short circuit between sound wave radiation from front and back sides of a driver membrane.  Because the same reason it can be viewed a small hump, up to 1,5-2dB, in the 140-280Hz range for majority woofer and midwoofer drivers. This hump is due in-phase summing front and back waves. This effect should be taken in consideration during the data analysis. The smoothing 1/12 oct is used for all measurements if there is no other stated like “no_smoothing” words.

Off axis magnitude response – the family off-axis frequency responses  measured at different angles at tested voltage 2,83V at 315mm distance  from intersection point  between the  main acoustic axis and test baffle plain.

Near field FR response (20 mm) normalized to 200 Hz – relative magnitude frequency response measured at tested voltage 2,83V at distance 20 mm from membrane and normalized to sound pressure level at 200 Hz. This kind of measurement allow  o analyze speaker driver frequency response in the piston range and detect the problem regions outside the piston range that are caused by the membrane and surround parasitic resonances. In the case of absence any defects the driver frequency response in the piston range is defined by the Qts parameter only and the normalized frequency level at the main resonance frequency Fs is approximately equals 20*log10(Qts). The parasitic and reflected signals level is so low that we can suppose the measurements is performed in the free field. Moreover, the meaning of this response is the correction that should be added to the frequency response meaning at 200 Hz from Axial magnitude frequency response at the same test voltage level to get the wanted sound pressure level at the frequency up to 200 Hz. For example, you know the Axial magnitude frequency response is reliable down to 200 Hz but you need to know what the sound pressure speaker driver  develops at 40 Hz at 5,6V voltage level. For this purpose you should choose 5,6V test voltage mode in the Axial magnitude frequency response, then to determine sound pressure level at 200 Hz and to add to it the value in dB at 40 Hz frequency from the diagram Near field FR response (20 mm) normalized to 200 Hz.

For the Accuton S280-6-282 driver the sound pressure level at voltage 5,6V at 200 Hz is 98 dB. The correction at 40 Hz is approximately 6,5 dB. So, the sound pressure level at 40 Hz equal =98dB+(-6,5dB)=91,5dB.

HD frequency response (315 mm distance) – harmonic distortion frequency response measured at different test voltages at the distance 315 mm and having 1/12 oct smoothing. We recommend use this kind of measurement from 150 Hz and higher up because decreasing of the useful signal level and increasing the measurement error.

HD frequency response (20  mm distance) – harmonic distortion frequency response measured at different test voltages at the distance 20 mm and having 1/12 oct smoothing. This kind of measurement gives a good precision at harmonic distortion measurement of woofers and midwoofers in frequency range up to 300 Hz.

Near field HD spectrum (20 mm distance) – the alternative method of measurement and displaying of harmonic distortion in the frequency range up to 300 Hz. The measurement distance is 20 mm, the smoothing is off. The measurement is performed at different test voltage levels and discrete frequencies. The main advantages of tis method are high signal to noise ratio and the displaying of more harmonic distortion components quantity. This kind of measurement gives a very good precision at harmonic distortion measurement of woofers and midwoofers in frequency range up to 300 Hz.

Impedance frequency response – frequency dependence of speaker driver impedance module. It is performed at some mA current level and is displayed in different scales for the purpose of more detail analysis of the problematic regions.

How to use the speaker driver models table?
You can use a sorting by the each column except the model name column. Just click on the column header and the data in the table will be sorted. On the next such click on the same header the data will be sorted in the opposite order.  Choose the speaker driver model of interest and click his name – you will go on this driver measurements page. You can add or delete this driver to the compare block if you click the red or blue cross symbol in the end of the string respectively.

To avoid incorrect  website functionality we strongly recommend to back return from a speaker driver measurement page and a compare page by means of buttons “Back to table” instead of the web browser  “Back” button. 

Brandsort descending Model Type Material Size, inch S, dB Zn, Ohm Fs, Hz Qts Vas, L
Accuton BD25-6-258 HF Diamond 1.0" 91.0 6 850 0.76 0.0
Accuton BD51-6-585 HF Diamond 2.0" 92.0 6 522 1.23 0.0
Accuton C25-6-012 HF Ceramic 1.0" 90.0 6 740 0.38 0.0
Accuton C90-6-724 MF Ceramic 5.0" 89.0 6 65 0.52 5.1
Accuton AS168-9-470 LF Sandwich 7.0" 84.0 9 27 0.35 35.5
Accuton C220-6-221 LF Ceramic 8.0" 90.0 6 28 0.37 79.0
Accuton C90-6-078 MF Ceramic 5.0" 88.0 6 100 0.92 3.9
Accuton C90-6-079 MF Ceramic 5.0" 87.5 6 105 0.57 3.2
Accuton C50-8-044 HF Ceramic 2.0" 89.0 8 380 0.74 0.0
Accuton S280-6-282 LF Sandwich 11.0" 93.0 6 20 0.26 226.0
Accuton C30-6-024 HF Ceramic 1.2" 93.0 6 930 0.69 0.0
Accuton C158-8-085 LF Ceramic 6.0" 89.0 8 33 0.31 35.0
Audax TW034X0 HF Fabric 1.3" 93.0 8 800 0.00 0.0
Audax TW025A28 HF Metal 1.0" 94.0 8 1180 0.00 0.0
Audax TW025A0 HF Fabric 1.0" 90.0 8 900 0.00 0.0
Beyma 5G40Nd MF Paper 5.0" 93.0 8 171 0.46 1.1
BlieSMa T34B-4 HF Metal 1.3" 97.5 4 790 0.35 0.0
BlieSMa T34A-4 HF Metal 1.3" 96.0 4 790 0.35 0.0
Bohlender &Graebener NEO3-PDRW HF Planar 1.8" 93.5 4 0 0.00 0.0
Celestion T5687A LF Paper 5.0" 89.2 8 104 0.46 4.3
Dayton Audio RS52AN-8 MF Metal 2.0" 91.0 8 383 0.77 0.0
Dayton Audio RS180-4 LF Metal 6.0" 89.2 4 38 0.46 21.2
Dayton Audio RS125-4 LF Metal 5.0" 89.9 4 57 0.37 5.3
Dayton Audio ND20FB-4 HF Fabric 0.8" 94.0 4 2072 1.33 0.0
Dayton Audio AMT2-4 HF Heil 1.3" 92.5 4 0 2.86 0.0
Eminence Deltalite-II-2512 LF Paper 12.0" 99.9 8 44 0.41 135.0
Eton 3-400/A8/25Mg MF Metal 3.0" 87.0 8 110 0.47 0.9
Eton 26HD1-8 HF Metal 1.0" 91.0 8 800 0.00 0.0
Focal Utopia 6W2Be LF Sandwich 6.5" 91.5 4 64 0.75 9.2
Fountek FR89EX-4 FR Metal 3.0" 86.7 4 96 0.45 1.1
Lambda Acoustics TD15X-Apollo LF Paper 15.0" 94.8 8 23 0.28 467.0
MarkAudio Alpair-10P FR Paper 5.0" 89.6 8 42 0.33 30.0
MarkAudio Alpair-10M FR Metal 5.0" 87.0 8 35 0.35 28.1
Morel ST1048 HF Fabric 1.1" 91.5 8 680 0.00 0.0
Morel SCM634 MF Sandwich 6.0" 89.0 4 49 0.40 14.0
Morel MDT32S HF Fabric 1.1" 90.0 8 650 0.00 0.0
Morel ET338-104 HF Fabric 1.1" 92.5 8 700 0.00 0.0
Morel CAT378 HF Fabric 1.1" 93.0 8 700 0.00 0.0
Morel TSCT1104 HF Fabric 1.1" 95.0 4 591 0.44 0.0
Peerless XT25SC90-04 HF Fabric 1.0" 90.1 4 825 0.93 0.0
Peerless OT19NC00-04 HF Fabric 0.8" 88.8 4 1029 1.27 0.0
Peerless 830875 LF Paper 6.0" 88.6 8 46 0.36 21.8
Peerless 830869 LF Paper 8.0" 89.6 8 30 0.31 87.4
Peerless DA25BG08-06 HF Metal 1.0" 94.2 6 721 0.51 0.0
Peerless BC25TG15-04 HF Fabric 1.0" 93.2 4 1128 0.84 0.0
Richard Allan CP8-8 FR Paper 8.0" 88.0 8 55 1.26 0.0
Richard Allan CG12 Super 8 blue LF Paper 12.0" 94.0 8 29 0.17 0.0
Richard Allan CG12 Super 8 red LF Paper 12.0" 92.0 8 32 0.23 0.0
Satori MW19P-4 LF Paper 7.0" 91.5 4 32 0.28 48.0
Satori TW29R HF Fabric 1.1" 92.0 4 600 0.76 0.0
Satori TW29B-B HF Metal 1.1" 92.0 4 600 0.90 0.0
Satori WO24P-8 LF Paper 9.0" 88.0 8 25 0.38 87.5
Satori MW16P-8 LF Paper 6.0" 87.5 8 29 0.33 48.0
SBacoustics SB26ADC-C000-4 HF Metal 1.0" 90.0 4 680 1.20 0.0
SBacoustics SB15NRXC30-8 LF Paper 5.0" 88.0 8 38 0.33 20.7
SBacoustics SB17NRXC35-4 LF Paper 6.0" 92.0 4 35 0.32 35.2
SBacoustics SB21RDC-C000-4 HF Fabric 0.8" 90.0 4 760 1.00 0.0
SBacoustics SB17MFC35-4 LF Plastic 6.0" 90.0 4 30 0.28 45.0
SBacoustics SB42FHC75-6 LF Sandwich 15.0" 93.0 6 23 0.37 318.0
SBacoustics SB23NACS45-8 LF Metal 8.0" 87.5 8 25 0.37 94.0
SBacoustics SB20PFC30-4 LF Paper 8.0" 92.5 4 34 0.33 66.2
SBacoustics SB20PFC30-8 LF Paper 8.0" 90.5 8 34 0.37 66.2
SBacoustics SB17NBAC35-8 LF Metal 6.0" 86.5 8 32 0.35 45.0
SBacoustics SB12NRXF25-4 LF Paper 4.0" 87.0 4 61 0.48 4.1
SBacoustics SB17CRC35-8 LF Sandwich 6.0" 87.0 8 28 0.34 48.0
SBacoustics SB29RDC-C000-4 HF Fabric 1.1" 93.0 4 600 0.65 0.0
SBacoustics SB29SDAC-C000-4 HF Fabric 1.1" 93.0 4 600 0.80 0.0
SBacoustics SB29RDNC-C000-4 HF Fabric 1.1" 94.0 4 680 0.45 0.0
SBacoustics SB26STCN-C000-4 HF Fabric 1.0" 92.5 4 960 0.84 0.0
SBacoustics SB21SDC-C000-4 HF Fabric 0.8" 91.0 4 720 0.95 0.0
Scan-Speak 12MU/4731T00 MF Paper 4.0" 90.0 4 64 0.24 5.4
Scan-Speak 18M/4631T00 MF Paper 6.5" 92.0 4 65 0.60 14.0
Scan-Speak 15W/8530K00 LF Paper 5.5" 85.5 8 30 0.27 27.4
Scan-Speak R2904/700009 HF Fabric 1.2" 94.5 4 520 0.33 0.0
Scan-Speak 26W/8861T00 LF Paper 10.0" 88.5 8 19 0.31 231.0
Scan-Speak 18W/8542-00 LF Paper 6.0" 89.0 8 30 0.23 47.9
Scan-Speak R3004/602010 HF Fabric 1.2" 87.4 4 420 0.74 0.0
Scan-Speak R3004/602000 HF Fabric 1.2" 87.4 4 625 1.14 0.0
Scan-Speak D3806/820000 HF Fabric 1.5" 89.0 6 450 0.48 0.0
Scan-Speak 10F/4424G00 FR GlassFiber 3.0" 89.8 4 90 0.29 2.0
Scan-Speak R2904/700000 HF Fabric 1.2" 94.5 4 520 0.33 0.0
Scan-Speak 26W/4534G00 LF Metal 10.0" 90.5 4 23 0.36 156.0
Scan-Speak D3004/660000 HF Fabric 1.2" 91.5 4 470 0.49 0.0
Scan-Speak 15M/4624G00 MF GlassFiber 5.0" 92.4 4 100 0.43 3.7
Scan-Speak D3004/602000 HF Fabric 1.2" 89.2 4 700 1.15 0.0
Scan-Speak 18W/8531G00 LF Paper 6.5" 87.0 8 28 0.36 58.2
Scan-Speak D2905/990000 HF Fabric 1.1" 91.0 6 500 0.63 0.0
Scan-Speak D2905/970000 HF Fabric 1.1" 89.5 6 500 0.47 0.0
Scan-Speak D2608/913000 HF Fabric 1.0" 91.3 8 700 0.29 0.0
Scan-Speak D2004/602000 HF Fabric 0.8" 88.4 4 600 1.07 0.0
Scan-Speak 15M/4531K00 MF Paper 5.0" 90.0 4 35 0.23 23.8
Scan-Speak 12M/4631G00 MF Paper 4.0" 89.0 4 75 0.33 2.3
Scan-Speak 10F/8424G00 FR GlassFiber 3.0" 86.6 8 90 0.37 2.1
Seas 22TFF (H1280) HF Fabric 0.9" 91.0 6 1050 0.00 0.0
Seas CA22RNY (H1471) LF Paper 8.0" 91.0 8 34 0.30 82.0
Seas FA22RCZ (H1597) FR Paper 8.0" 94.0 8 30 0.35 134.0
Seas T25CF002 HF Fabric 1.0" 89.0 6 500 0.00 0.0
Seas W22EX001 (E0022) LF Metal 8.0" 88.0 8 25 0.34 98.0
Seas L18RNX/P (H1224) LF Metal 6.0" 88.0 8 36 0.31 30.0
Seas T25CF001 HF Fabric 1.0" 91.0 6 700 0.00 0.0
Seas M15CH002 (E0043) MF Paper 5.0" 88.5 6 67 0.40 6.0
Seas 22TAF/G (H1283) HF Metal 0.9" 92.0 6 1100 0.00 0.0
Seas M15CH-JAM MF Metal 5.0" 86.0 8 43 0.43 0.0
Seas 27TDFC (H1189) HF Fabric 1.0" 90.0 6 550 0.00 0.0
Seas 27TDC (H1149) HF Fabric 1.0" 90.0 6 550 0.00 0.0
Seas 19TAF/D (H0561) HF Metal 0.8" 87.0 8 1700 0.00 0.0
Seas 27TBFC/G (H1212) HF Metal 1.0" 91.5 6 550 0.00 0.0
Seas 27TFFNC/G (H1396-04) HF Fabric 1.0" 91.0 4 1170 0.00 0.0
Silver Flute W14RC25-04 LF Paper 5.0" 90.0 4 43 0.28 19.0
Sonido SWR200-8 ALNICO FR Paper 8.0" 93.6 8 42 0.39 62.5
TB Speakers W4-1337SD FR Metal 4.0" 87.0 8 70 0.37 4.9
TB Speakers 75-1558SE MF Fabric 3.0" 90.0 8 260 0.00 0.0
TB Speakers 28-1177SB HF Fabric 1.1" 90.0 8 775 0.00 0.0
Usher 9950-20 HF Fabric 1.1" 88.0 8 560 0.00 0.0
Usher 8945P LF Paper 6.0" 86.0 8 34 0.34 37.2
Usher 8948A LF Paper 6.0" 88.0 8 31 0.27 43.7
Viawave RT850 HF Ribbon 0.9" 93.0 7 1500 0.00 0.0
Vifa NE149W-04 LF Paper 5.0" 89.2 4 70 0.42 4.6
Vifa XT25TG30-04 HF Fabric 1.0" 90.8 4 436 0.44 0.0
Vifa XT25BG60-04 HF Fabric 1.0" 93.6 4 589 0.32 0.0
Vifa NE19VTS-04 HF Fabric 0.8" 88.3 4 743 1.36 0.0
Vifa DX25TG09-04 HF Fabric 1.0" 92.0 4 703 0.58 0.0
Vifa DQ25SC16-04 HF Metal 1.0" 94.1 4 1370 1.08 0.0
Vifa NE19VTA-04 HF Metal 0.8" 89.4 4 775 1.07 0.0
Vifa NE180W-04 LF Paper 6.0" 89.8 4 39 0.29 22.5
Wavecor TW030WA13 HF Fabric 1.2" 93.5 4 690 1.01 0.0
Wavecor TW030WA11 HF Fabric 1.2" 93.5 4 410 0.79 0.1
Wavecor TW022WA05 HF Fabric 0.9" 91.5 4 750 1.08 0.0
Wavecor WF120BD03 LF Paper 4.8" 88.5 4 70 0.37 4.3
Wavecor WF182BD03 LF Paper 7.0" 91.0 4 34 0.25 32.4

Compare

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Poll

How many loudspeakers have you constructed?

>10 ...
38% (33 votes)
4 - 6
23% (20 votes)
1 - 3
22% (19 votes)
7 - 10
16% (14 votes)
Total votes: 86