My Projects - Scan Speak MT 

(Page 01)

 

Construction of MT enclosures

using Scan Speak drivers 

Design by : Jiri

Constructed by : Jiri

 

Scan Speak Mid/bass driver 18W/8531G00

 

TYPICAL CHARACTERISTICS

 

 

 

 

Nominal impedance

Zn

W

8

Sensitivity(2.83V/1m)

-

dB SPL

87

Usable freq. range

-

Hz

-

Power handling capacity 100h RMS (IEC17.1)

-

W

60

Max Sound Pressure Level

SPLmax

dB SPL

-

Min. impedance modulus

Zmin

Hz

6.4

Voice-coil inductance

Le

mH

0.35

Voice-coil inductance @ 10kHz

-

-

-

BL product

BL

N/A

-

Moving mass

Mms

kg

0.175

 

THIELE-SMALL PARAMETERS: TYPICAL (QC LIMITS)

 

 

 

Resonance frequency

Fs

Hz

28

DC Resistance

Re

W

5.8

Mechanical quality factor

Qms

1

5.10

Electrical quality factor

Qes

1

0,39

Total quality factor

Qts

1

0,36

Mechanical suspension compliance

Cms

mm/N

1.85

Effective piston area

Sd

cm2

150

Equivalent Volume

Vas

l

58.2

Max linear excursion

Xmax

mm

11.0

Linear displacement volume

Vd

 

Half-space efficiency

h0

%

 

Unity load volume

Vas.Qts2

10-3.m3

 

 

ABSOLUTE MAXIMUM RATINGS

 

 

 

Short term max. input voltage

Vmax

V

 

Max.excursion before damage

Xdam

mm

 

Ambient operating temperature

Ta

C

 

Storage temperature

-

C

 

Environemental withstanding Q

-

-

 

 

APPLICATION INFORMATION

 

 

 

Air volume occupied by the driver

-

 

Speaker net mass

 

kg

1.7

Recommended reflex box

Vb/Fb

Lts/Hz

 

 

Scan Speak Tweeter Driver R2904/700005

 

 

T S Parameters

Resonance frequency [fs] 520Hz

Mechanical Q factor [Qms] 2.90

Electrical Q factor [Qes] 0.38

Total Q factor [Qts] 0.33

Force factor [Bl] 2.8Tm

Mechanical resistance [Rms] 0.34kg/s

Moving mass [Mms] 0.3g

Suspension compliance [Cms] 0.31mm/N

Effective diaph. diameter [D] 27mm

Effective piston area [Sd] 5.6cm

Equivalent volume [Vas] 0.01l

Sensitivity(2.83V/1m) 94.5dB

Ratio Bl/Re 1.62N/W

Ration fs/Qts 1566Hz

 

Electrical Data

Nominal impedance [Zn] 4K

Minimum impedance [Zmin] 3.7K

Maximum impedance [Zo] 26.2K

DC resistance [Re] 3K

Voice coil inductance [Le] 0.01mH

 

Power Handling

100h RMS noise test (IEC17.1)* 160W

Long $ term max power (IEC17.3)* $W

*Filter:2.order HPButterworth,2.5kHz

 

Voice Coil and Magnet Data

Voice coil diameter 26mm

Voice coil height 2.1mm

Voice coil layers 2

Height of gap 2.5mm

Linear excursion 0.2mm

Max mech.excursion 1.6mm

Unit weight 0.4kg

 

PROJECT  MT

Enclosure sealed volume 20l no bracing

Enclosure material MDF 32+32mm 64mm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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