Measurements and compare

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Measurement setup description (click to unfold)

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 – 1650x1150 mm
Measuring equipment:
- measuring microphone Brüel & Kjær 4133
- microphone preamplifier Brüel & Kjær 2639
- preamplifier power supply Brüel & Kjær 2804
- sound levek calibrator MMF 05000 (94 dB/1kHz)
- sound card EMU-0202USB with upgraded op amps to OPA1612
- DSP Xilica XM2040
- second-order analog ultralinear high-pass filters with switched cutoff frequencies from 20 to 2000 Hz based on the OPA1612 op amps
- ultralinear power amplifier PURIFI 1ET400A

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.

Brand	Model	Premium	Type	Material	Size, inch	S, dB	Zn, Ohm	Fs, Hz	Qts	Vas, L
Viawave	RT850	Yes	HF	Ribbon	0.9"	93.0	7	1500	0.00	0.0
Wavecor	WF120BD03	No	LF	Paper	4.0"	88.5	4	70	0.37	4.3
Wavecor	TW022WA05	No	HF	Fabric	0.9"	91.5	4	750	1.08	0.0
Wavecor	TW030WA13	No	HF	Fabric	1.2"	93.5	4	690	1.01	0.0
Scan-Speak	15M/4624G00	Yes	MF	GlassFiber	5.0"	92.4	4	100	0.43	3.7
Richard Allan	CG12 Super 8 red	Yes	LF	Paper	12.0"	92.0	8	32	0.23	0.0
Richard Allan	CG12 Super 8 blue	Yes	LF	Paper	12.0"	94.0	8	29	0.17	0.0
Richard Allan	CP8-8	Yes	FR	Paper	8.0"	88.0	8	55	1.26	0.0
Accuton	BD51-6-585	Yes	HF	Diamond	2.0"	92.0	6	522	1.23	0.0
Accuton	BD25-6-258	Yes	HF	Diamond	1.0"	91.0	6	850	0.76	0.0
Seas	T25CF002	Yes	HF	Fabric	1.0"	89.0	6	500	0.00	0.0
SBacoustics	SB23NACS45-8	Yes	LF	Metal	8.0"	87.5	8	25	0.37	94.0
Scan-Speak	26W/4534G00	Yes	LF	Aluminum	10.0"	90.5	4	23	0.36	156.0
Satori	MW16P-8	Yes	LF	Paper	6.0"	87.5	8	29	0.33	48.0
Accuton	C90-6-079	Yes	MF	Ceramic	5.0"	87.5	6	105	0.57	3.2
Scan-Speak	D2608/913000	Yes	HF	Fabric	1.0"	91.3	8	700	0.29	0.0
Accuton	C25-6-012	Yes	HF	Ceramic	1.0"	90.0	6	740	0.38	0.0
Accuton	S280-6-282	Yes	LF	Sandwich	11.0"	93.0	6	20	0.26	226.0
Accuton	C220-6-221	Yes	LF	Ceramic	8.0"	90.0	6	28	0.37	79.0
Scan-Speak	D3004/660000	Yes	HF	Fabric	1.2"	91.5	4	470	0.49	0.0
Vifa	NE149W-04	Yes	LF	Paper	5.0"	89.2	4	70	0.42	4.6
SBacoustics	SB15NRXC30-8	Yes	LF	Paper	5.0"	88.0	8	38	0.33	20.7
Morel	CAT378	Yes	HF	Fabric	1.1"	93.0	8	700	0.00	0.0
Zaph Audio	ZA14W08	Yes	LF	Aluminum	5.0"	87.0	8	65	0.44	5.2
SBacoustics	SB17NBAC35-8	Yes	LF	Aluminum	6.0"	86.5	8	32	0.35	45.0
SBacoustics	SB26ADC-C000-4	Yes	HF	Aluminum	1.0"	90.0	4	680	1.20	0.0
SBacoustics	SB21RDC-C000-4	Yes	HF	Fabric	0.8"	90.0	4	760	1.00	0.0
Scan-Speak	12MU/4731T00	Yes	MF	Paper	4.0"	90.0	4	64	0.24	5.4
Seas	22TFF (H1280)	Yes	HF	Fabric	0.9"	91.0	6	1050	0.00	0.0
SBacoustics	SB21SDC-C000-4	Yes	HF	Fabric	0.8"	91.0	4	720	0.95	0.0
Beyma	5G40Nd	Yes	MF	Paper	5.0"	93.0	8	171	0.46	1.1
Seas	27TBCD/GB-DXT	Yes	HF	Metal	1.0"	92.0	6	900	0.00	0.0
Peerless	OT19NC00-04	Yes	HF	Fabric	0.8"	88.8	4	1029	1.27	0.0
SBacoustics	SB29SDAC-C000-4	Yes	HF	Fabric	1.1"	93.0	4	600	0.80	0.0
SBacoustics	SB34NRXL75-8	Yes	LF	Paper	12.0"	91.0	8	22	0.28	205.0
Vifa	NE19VTS-04	Yes	HF	Fabric	0.8"	88.3	4	743	1.36	0.0
Accuton	C168-6-990	Yes	MF	Ceramic	6.0"	93.0	6	55	0.21	13.1
Accuton	C173-6-096	Yes	LF	Ceramic	6.0"	94.0	6	39	0.17	28.0
Accuton	C173-6-090	Yes	MF	Ceramic	6.0"	93.0	6	57	0.24	15.5
Accuton	C30-6-358	Yes	HF	Ceramic	1.2"	93.5	6	810	0.62	0.0
Accuton	C25-6-158	Yes	HF	Ceramic	1.0"	92.5	6	810	0.61	0.0
Accuton	S280-6-283N	Yes	LF	Sandwich	11.0"	93.0	6	20	0.18	227.0
Vifa	NE19VTA-04	Yes	HF	Aluminum	0.8"	89.4	4	775	1.07	0.0
Accuton	C173-4-091N	Yes	MF	Ceramic	6.0"	95.0	4	85	0.28	0.0
Vifa	XT25BG60-04	Yes	HF	Fabric	1.0"	93.6	4	589	0.32	0.0
Vifa	XT25TG30-04	Yes	HF	Fabric	1.0"	90.8	4	436	0.44	0.0
Vifa	DX25TG09-04	Yes	HF	Fabric	1.0"	92.0	4	703	0.58	0.0
Vifa	DQ25SC16-04	Yes	HF	Titanium	1.0"	94.1	4	1370	1.08	0.0
Usher	8948A	Yes	LF	Paper	6.0"	88.0	8	31	0.27	43.7
Usher	9950-20	Yes	HF	Fabric	1.1"	88.0	8	560	0.00	0.0
Accuton	C90-6-078	Yes	MF	Ceramic	5.0"	88.0	6	100	0.92	3.9
Accuton	C50-8-044	Yes	HF	Ceramic	2.0"	89.0	8	380	0.74	0.0
Satori	TW29B	Yes	HF	Beryllium	1.1"	92.0	4	600	0.90	0.0
TB Speakers	W4-1337SD	Yes	FR	Titanium	4.0"	87.0	8	70	0.37	4.9
Seas	W12CY003 (E0044)	Yes	LF	Paper	4.0"	85.5	8	60	0.36	4.0
Dayton Audio	RS52AN-8	Yes	MF	Aluminum	2.0"	91.0	8	383	0.77	0.0
Seas	22TAF/G (H1283)	Yes	HF	Aluminum	0.9"	92.0	6	1100	0.00	0.0
Eton	MAS 80	Yes	MF	Sandwich	3.0"	83.0	4	113	0.61	0.6
Morel	TSCT1104	Yes	HF	Fabric	1.1"	95.0	4	591	0.44	0.0
Morel	MDT32S	Yes	HF	Fabric	1.1"	90.0	8	650	0.00	0.0
Morel	SCW636	Yes	LF	Sandwich	6.0"	87.0	6	40	0.29	18.5
Accuton	AS190-9-251	Yes	LF	Sandwich	8.0"	84.0	9	33	0.44	26.7
Seas	W15LY001 (E0041)	Yes	LF	Paper	5.0"	86.5	8	49	0.45	12.0
Satori	TW29BN	Yes	HF	Beryllium	1.1"	95.0	4	700	0.46	0.0
Seas	CA15RLY (H1216)	Yes	LF	Paper	5.0"	87.5	8	44	0.34	14.0
Scan-Speak	D3404/552000	Yes	HF	Fabric	1.3"	97.0	4	475	0.57	0.0
Peerless	DX20BF00-04	Yes	HF	Fabric	0.8"	90.1	4	822	1.27	0.0
Scan-Speak	D2904/710003	Yes	HF	Fabric	1.2"	94.4	4	520	0.44	0.0
Scan-Speak	D3004/604000	Yes	HF	Beryllium	1.2"	90.9	4	750	1.41	0.0
Scan-Speak	D3004/664000	Yes	HF	Beryllium	1.2"	91.5	4	500	0.54	0.0
Satori	TW29DN	Yes	HF	Fabric	1.1"	96.5	4	650	0.43	0.0
TB Speakers	75-1558SE	Yes	MF	Fabric	3.0"	90.0	8	260	0.00	0.0
TB Speakers	28-1177SB	Yes	HF	Fabric	1.1"	90.0	8	775	0.00	0.0
SBacoustics	SB42FHC75-6	Yes	LF	Sandwich	15.0"	93.0	6	23	0.37	318.0
Scan-Speak	D3806/820000	Yes	HF	Fabric	1.5"	89.0	6	450	0.48	0.0
Scan-Speak	18W/8542-00	Yes	LF	Paper	6.0"	89.0	8	30	0.23	47.9
Scan-Speak	15W/8530K00	Yes	LF	Paper	5.5"	85.5	8	30	0.27	27.4
Scan-Speak	R2904/700009	Yes	HF	Fabric	1.2"	94.5	4	520	0.33	0.0
Scan-Speak	18M/4631T00	Yes	MF	Paper	6.5"	92.0	4	65	0.60	14.0
Scan-Speak	R3004/602010	Yes	HF	Fabric	1.2"	87.4	4	420	0.74	0.0
Scan-Speak	R3004/602000	Yes	HF	Fabric	1.2"	87.4	4	625	1.14	0.0
Scan-Speak	D2908/714000	Yes	HF	Beryllium	1.1"	92.0	8	534	0.47	0.0
Scan-Speak	10F/8424G00	Yes	FR	GlassFiber	3.0"	86.6	8	90	0.37	2.1
Accuton	C30-6-024	Yes	HF	Ceramic	1.2"	93.0	6	930	0.69	0.0
Scan-Speak	D2905/990000	Yes	HF	Fabric	1.1"	91.0	6	500	0.63	0.0
Scan-Speak	D2905/970000	Yes	HF	Fabric	1.1"	89.5	6	500	0.47	0.0
SBacoustics	SB17MFC35-4	Yes	LF	Plastic	6.0"	90.0	4	30	0.28	45.0
SBacoustics	SB26STCN-C000-4	Yes	HF	Fabric	1.0"	92.5	4	960	0.84	0.0
SBacoustics	SB29RDC-C000-4	Yes	HF	Fabric	1.1"	93.0	4	600	0.65	0.0
SBacoustics	SB29RDNC-C000-4	Yes	HF	Fabric	1.1"	94.0	4	680	0.45	0.0
Scan-Speak	R2904/700000	Yes	HF	Fabric	1.2"	94.5	4	520	0.33	0.0
Scan-Speak	D3004/602000	Yes	HF	Fabric	1.2"	89.2	4	700	1.15	0.0
Sonido	SWR200-8 ALNICO	Yes	FR	Paper	8.0"	93.6	8	42	0.39	62.5
Vifa	NE25VTS-04	Yes	HF	Fabric	1.0"	91.3	4	733	0.89	0.0
Silver Flute	W14RC25-04	Yes	LF	Paper	5.0"	90.0	4	43	0.28	19.0
B&C	DE10-8	Yes	HF	Plastic	1.0"	107.0	8	0	0.00	0.0
Seas	19TAF/D (H0561)	Yes	HF	Aluminum	0.8"	87.0	8	1700	0.00	0.0
Seas	27TFFNC/G (H1396-04)	Yes	HF	Fabric	1.0"	91.0	4	1170	0.00	0.0
Seas	27TDC (H1149)	Yes	HF	Fabric	1.0"	90.0	6	550	0.00	0.0
Seas	27TBFC/G (H1212)	Yes	HF	Aluminum	1.0"	91.5	6	550	0.00	0.0

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Measurements and compare

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Measurement setup description (click to unfold)

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Measurements and compare

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