LEM H150, H300A, H150A, H200A, H350 Service Manual

...

Index

Technical data2 Passive versions3

Powered & passive loudspeaker systems

hurricane

Checking & adjustement H100MA, H150A, H200A, H200MA schematics8

H300A, H300MA schematics

10 H350A schematics 11

H350SA, H400SA schematics

12 Spare part list

service manual

schematic diagrams

Notice

Service must be carried out by qualified personnel only. Any tampering carried out by unqualified personnel during the guarantee period

✔

will forfeit the right to guarantee. For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.

✔

To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.

✔

All components marked by this symbol have special safety characteristics, when replacing any of these components use only manufacturer's specified parts. The (μ) micro symbol of capacitance value is substituted by U.

✔

The (

✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

✒

Ω) omega symbol of resistance value is substituted by E.

The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified. All resistors are 1/8W unless otherwise specified. All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.

Soldering point. Male connector.

Female connector.

M/F faston connector.

ATTENTION Observe precautions when handling electrostatic sensitive devices.

Supply voltage. Logic supply ground. Test point.

Flag joined with one or more flags with the same signal name inscribed.

Analog supply ground.

Chassis ground. Earth ground.

GENERALMUSIC Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12

CODE: 270306 version 1.02

Phone +39(0)541/959511 - Fax +39(0)541/957404 - Internet: www.generalmusic.com

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Technical Data

loudspeaker models

components

power handling

(EIA RS-426A)

impedance

passive crossover

connections

construction

dimensions mm (LxAxP)

weight (passive / active)

amplifier specifications

input

active crossover

high

H150 / H150A H200 / H200A H300 / H300A H350 / H350A H500 H350S / H350SA H400S / H400SA H100MA H200MA H300MA

1" driver on EWT horn mid low

10" woofer 12" woofer 15" woofer 15" woofer 2 x 15" woofer 15" woofer 18" woofer -

150W cont.

300W peak

8Ohm 8Ohm 4/8Ohm 4/8Ohm 4Ohm 4Ohm 4Ohm

3,5 kHz

12/18dB/oct.

340x460x285 390x508x325 455x580x405 455x790x405 475x555x520 625x540x545 305x395x275 390x508x325 455x580x405

14kg / 18,5kg 17kg / 22kg 23kg / 27,5kg 29kg / 33,5kg 40kg 29,5kg / 35,6kg 38kg / 43kg 13kg 20,5kg 27kg

H150A H200A H300A H350A H350SA H400SA H100MA H200MA H300MA

- -

200W cont.

400W peak

3,5 kHz

12/18 dB/oct.

high-density poplar chipboard with scratch-resistant gark grey carpet - Metal grid - 1/2 handles - Speaker stand adapter

300W cont.

600W peak

3kHz

12/18 dB/oct.

3.5Khz@

12/18dB/oct.

1,5" supertweeter

8" midrange - 8" full-range

350W cont.

700W peak

6kHz @ 18dB/ott.

600Hz @ 12dB/oct.

6Khz@

12/12dB/oct.

1" driver on EWT horn

500W cont.

1000W peak

200Hz@ 6dB/ott.

2.2kHz@12/18dB/oct .

485x1060x435

sensitivity 0 dB (nominal)

impedance 20 kOhms (balanced)

80-320Hz/-3dB @

350W cont.

700W peak

200Hz

6/6 dB/ott.

12dB/oct.

400W cont.

800W peak

120 Hz

6/6 dB/ott.

80-320Hz@

12dB/oct.

1" driver on EWT horn

12" woofer

3,5 kHz

12/18dB/oct.

-1/2 SPEAKON

15" woofer

3.5Khz@

12/18dB/oct.

power output EIA (1kHz, THD 1%)

distortion

controls

connectors

power supply

system specifications

frequency response (-10dB)

MAX SPL continuous sens.

dispersion

150Watt 200Watt

volume - SHIELD volume - SHIELD - Xover freq. volume - SHIELD

1 x XLR-F + 1 x JACK in parallel 1 x XLR-F + 1 x JACK in parallel

H150 / H150A H200 / H200A H300 / H300A H350 / H350A H500 H350S / H350SA H400S / H400SA H100MA H200MA H300MA

60Hz-20kHz

117 dB 120 dB 123 dB 122 dB 122 dB 122 dB 114 dB

60°x40° 60°x40° 60°x40° 120°x40° 90°x90° 60°x40° 60°x40°

55Hz-20kHz 48Hz-20kHz 38Hz-25kHz 38Hz-300Hz 32Hz-300Hz 65Hz-20kHz

50W high

250W low

80W high

270W low

see label

40Hz-20kHz

122 dB

60°x40°

350Watt 400Watt 100Watt 200Watt

<0.02 %

2xJACK+XLR-F(in)

2 x JACK + XLR-M (out)

55Hz-20kHz

120 dB

50W high

250W low

48Hz-20kHz

123 dB

General Precaution

• To prevent short circuit during any test, the oscilloscope must be EARTH insulated, this occurs because some test require to connect its probe to the ampliﬁ er output, non-compliance may cause damages to oscilloscope inputs circuitry.

• Before removing or installing any modules and connectors, disconnect the ampliﬁ er from AC MAINS and measure the DC supply voltages across each of the power suppliy capacitors. If your measurement on any of the caps is greater than 10Vdc, connect a 100Ω 10W resistor across the applicable caps to discharge them for your safety. Remember to remove the discharge resistor immediately after discharging caps. Do not power up the ampliﬁ er with the discharge resistor connected.

• Read these notes entirely before proceeding to any operation. These notes are not comprehensive of all damages that possibly occur, but includes some speciﬁ cally advices, checks and adjustments relative to this ampliﬁ ed speaker.

• Do not check the ampliﬁ er with the speaker connected use only an appropriate load resistor.

• BE CAREFUL increasing the Variac you must not exceed the nominal mains voltage plus its tolerance (see speciﬁ cations) any upper voltage can be cause of damage.

Visual Check

• Check the speakers for any damaging (cone-breaking, interruption or so).

• Before proceed to supply the ampliﬁ er check visually the internal assembly, if appears an evident damage ﬁ nd the most possible reasons that cause it.

• Check the wiring cables for possible interruptions or shorts.

• If the damage has burnt a printed circuit board don’t try to repair it, replace with a new one.

Test Instruments

• Audio Generator

• Dual Trace Oscilloscope

• Digital Multimeter

• Temperature Meter

• 8Ω 500W, 4Ω 500W, 100Ω 10W resistors

• Variac (0÷250Vac)

H100MA CHECKING & ADJUSTMENTS

The following adjustment and notes are relative to these models only.

Technical Specifications

Dimensions: .....................H100MA (WxHxD) ................................ 305x395x275mm

Weight: ............................ H100MA .............................................. 13Kg

Power Requirements: .........(230Vac±10% 50Hz) ............................ 150VA

.......................................(115Vac±10% 50/60Hz) ....................... 150VA

Output Power*: .................(8Ω) ................................................... 90W

Max.Undistorted Out*: .......(8Ω) ................................................... 76Vpp

Sensitivity: .......................H100MA (1W/1m) ................................ 92.6dBSPL

Max SPL: ..........................H100MA (continuous) ........................... 112dBSPL

.......................................H100MA (peak) .................................... 115dBSPL

Frequency Response ..........(ampliﬁ er+speaker) .............................. 65Hz÷20KHz

.......................................(only ampliﬁ er -3dB)............................. 10Hz÷60KHz

Input Sensitivity: ...............(0dB) .................................................. 0.775VRMS

Input Impedance: ..............(balanced) ........................................... 30KΩ

.......................................(unbalanced) ....................................... 15KΩ

Voltage Gain: .............................................................................. 31±1dB

IMD: ................................ (SMPTE 60Hz/7KHz 4:1)........................ <0.1%

THD: ...............................(THD+N) ............................................. <0.1%

S/N Ratio: ........................(unweighted) ....................................... >100dB

*Note: measured with the limiter enabled.

Setup

• Verify, with the Multimeter, the insulation between the heatsink and the transistors collectors. Also see Advices section.

• Verify, with the Multimeter, the PTC resistor value (TH1), it must be between 50Ω and 200Ω.

• Connect the Variac between the mains and the ampliﬁ er and set it at zero voltage.

• Connect the audio generator to the channel input and set it to 1kHz 775mVRMS (0dB) sinusoidal signal.

• Place the temperature sensor between heatsink and the PTC (TH1).

• Connect the CH1 scope GND clip to CN4 pin 1 (SGND terminal) and the probe tip to R50 side RL1 (PWR out), set it to 20V/div. 1mS/div.

• Connect the CH2 probe tip to R58 side C28 and set its sensitivity at 0.2V/div.

• Set the LEVEL potentiometer full clockwise.

• The load resistor is disconnected.

• The procedures that follow must be executed subsequently in the order speciﬁ ed.

Supply Check

• Remove the transformer secondary fuses (located on SUPPLY board), set the Variac to the nominal mains voltage, check with the Multimeter the AC supply voltages: F1-F2=71±2Vac

• Re-set the Variac at zero voltage, turn off the ampliﬁ er and put the fuses back on its holders.

• Set up the Variac slowly monitoring the Outputs with the oscilloscope CH1 connected, starts from 2/3 of nominal mains voltage it should display the sinusoidal input signal ampliﬁ ed with no distortions, if a distortion occur or the protection trips, turn off the ampliﬁ er and check the AMPLIFIER board as suggested in the ADVICES section.

• Finally verify the DC supplies on SUPPLY board: CN4 pin 2 (+Vcc1) =+50±2Vdc CN5 pin 1-2 (-Vcc1) =-50±2Vdc CN4 pin 4 =+15±1Vdc CN4 pin 5 =-15±1Vdc

• If one or more voltages don’t correspond, check the rectiﬁ ers, capacitors and transformers disconnecting them from circuitry, refer to schematics.

Channel Check

VOLTAGE AMPLIFIER TEST:

• Increase slowly the Variac. The channel output signals must be symmetrical respect the GND without visible distortion and oscillation. If there is a distortion read the section ADVICES.

CURRENT AMPLIFIER TEST:

• Connect the 8Ω 500W load on the output and repeat the test.

LIMITER CHECK:

• Increase the input signal of 10 dB and verify the output voltage and wave shape remain constant.

BIAS ADJUSTMENT:

• With resistive load connected wait until the temperature reach 50°c.

• Set the generator level at zero, connect the Multimeter across the R50 and R53 resistors, then adjust VR1 trimmer to read 5±0.1mVdc.

BANDWIDTH CHECK:

• Switch alternatively the generator frequency to 100Hz and 10kHz, no level changes must be detectable respect 1kHz.

• Switch the generator frequency to 30Hz and verify the output level decreases abruptly respect to 1 KHz level.

OFFSET SENSOR CHECK:

• Set the Variac to zero voltage output, disconnect resistive load from the ampliﬁ er output, connect temporarily (by means of a suitable conductor wire) CN4 pin 4 (+15Vdc) to R72 side RL1, the protection circuitry (Q14,15,16) detect the DC voltage and open the output relay (RL1) within 3 seconds approx.

• Remove the connection, wait until the relay switch on and after some seconds repeat the check with -15Vdc (available on CN4 pin 5), the protection circuitry must open the relay again.

SIGNAL TO NOISE RATIO CHECK:

• Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket shorted) the output signal (noise) must be less than 1mV.

H150A H200A H200MA CHECKING & ADJUSTMENTS

The following adjustment and notes are relative to these models only.

Technical Specifications

Dimensions: .....................H150A (WxHxD) ................................... 340x460x285mm

.......................................H200A (WxHxD) ................................... 390x508x325mm

.......................................H200MA (WxHxD) ................................ 390x508x325mm

Weight: ............................H150A ................................................ 18.5Kg

.......................................H200A ................................................ 22Kg

.......................................H200MA .............................................. 20.5Kg

Power Requirements: .........(230Vac±10% 50Hz) ............................ 180VA

.......................................(115Vac±10% 50/60Hz) ....................... 180VA

Output Power*: .................(8Ω) ................................................... 136W

Max.Undistorted Out*: .......(8Ω) ................................................... 93Vpp

Sensitivity: .......................H150A (1W/1m) ................................... 92.5dBSPL

.......................................H200A H200MA (1W/1m) ......................96.4dBSPL

Max SPL: ..........................H150A (continuous) .............................. 114dBSPL

.......................................H150A (peak) ...................................... 117dBSPL

.......................................H200A H200MA (continuous) ................. 118dBSPL

.......................................H200A H200MA (peak) .......................... 121dBSPL

Frequency Response ..........H150A (ampliﬁ er+speaker) .................... 60Hz÷20KHz

.......................................H200A (ampliﬁ er+speaker) .................... 55Hz÷20KHz

.......................................(only ampliﬁ er -3dB)............................. 10Hz÷60KHz

Input Sensitivity: ...............(0dB) .................................................. 0.775VRMS

Input Impedance: ..............(balanced) ........................................... 30KΩ

.......................................(unbalanced) ....................................... 15KΩ

Voltage Gain: .............................................................................. 33±1dB

IMD: ................................ (SMPTE 60Hz/7KHz 4:1)........................ <0.1%

THD: ...............................(THD+N) ............................................. <0.1%

S/N Ratio: ........................(unweighted) ....................................... >100dB

*Note: measured with the limiter enabled.

Setup

• Verify, with the Multimeter, the insulation between the heatsink and the transistors collectors. Also see Advices section.

• Verify, with the Multimeter, the PTC resistor value (TH1), it must be between 50Ω and 200Ω.

• Connect the Variac between the mains and the ampliﬁ er and set it at zero voltage.

• Connect the audio generator to the channel input and set it to 1kHz 775mVRMS (0dB) sinusoidal signal.

• Place the temperature sensor between heatsink and the PTC (TH1).

• Connect the CH1 scope GND clip to CN4 pin 1 (SGND terminal) and the probe tip to R50 side RL1 (PWR out), set it to 20V/div. 1mS/div.

• Connect the CH2 probe tip to R58 side C28 and set its sensitivity at 0.2V/div.

• Set the LEVEL potentiometer full clockwise.

• The load resistor is disconnected.

• The procedures that follow must be executed subsequently in the order speciﬁ ed.

Supply Check

• Remove the transformer secondary fuses (located on SUPPLY board), set the Variac to the nominal mains voltage, check with the Multimeter the AC supply voltages: F1-F2=90±2Vac

• Re-set the Variac at zero voltage, turn off the ampliﬁ er and put the fuses back on its holders.

• Finally verify the DC supplies on SUPPLY board: CN4 pin 2 (+Vcc1) =+63±2Vdc CN5 pin 1-2 (-Vcc1) =-63±2Vdc CN4 pin 4 =+15±1Vdc CN4 pin 5 =-15±1Vdc

• If one or more voltages don’t correspond, check the rectiﬁ ers, capacitors and transformers disconnecting them from circuitry, refer to schematics.

Channel Check

VOLTAGE AMPLIFIER TEST:

• Increase slowly the Variac. The channel output signals must be symmetrical respect the GND without visible distortion and oscillation. If there is a distortion read the section ADVICES.

CURRENT AMPLIFIER TEST:

• Connect the 8Ω 500W load on the output and repeat the test.

LIMITER CHECK:

• Increase the input signal of 10 dB and verify the output voltage and wave shape remain constant.

BIAS ADJUSTMENT:

• With resistive load connected wait until the temperature reach 50°c.

• Set the generator level at zero, connect the Multimeter across the R50 and R53 resistors, then adjust VR1 trimmer to read 5±0.1mVdc.

BANDWIDTH CHECK:

• Switch alternatively the generator frequency to 100Hz and 10kHz, no level changes must be detectable respect 1kHz.

• Switch the generator frequency to 30Hz and verify the output level decreases abruptly respect to 1 KHz level.

OFFSET SENSOR CHECK:

• Remove the connection, wait until the relay switch on and after some seconds repeat the check with -15Vdc (available on CN4 pin 5), the protection circuitry must open the relay again.

SIGNAL TO NOISE RATIO CHECK:

• Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket shorted) the output signal (noise) must be less than 1mV.

H300A H300MA CHECKING & ADJUSTMENTS

The following adjustment and notes are relative to these models only.

Technical Specifications

Dimensions: .....................H300A (WxHxD) ................................... 455x580x405mm

.......................................H300MA (WxHxD) ................................ 455x580x405mm

Weight: ............................H300A ................................................ 27.5Kg

.......................................H300MA .............................................. 27Kg

Power Requirements: .........(230Vac±10% 50Hz) ............................ 310VA

.......................................(115Vac±10% 50/60Hz) ....................... 310VA

Output Power*: .................(4Ω/8Ω) .............................................. 230W/80W

Max.Undistorted Out*: .......(4Ω/8Ω) .............................................. 85Vpp/71Vpp

Active crossover: ...............(frequency Hz @ slope dB/oct.) .............. 3.5K@12/18

Sensitivity: ....................... H300A H300MA (1W/1m) ...................... 97.3dBSPL

Max SPL: ..........................H300A H300MA (continuous) ................. 121dBSPL

.......................................H300A H300MA (peak) .......................... 124dBSPL

Frequency Response ..........(ampliﬁ er+speaker) .............................. 48Hz÷20KHz

.......................................(only ampliﬁ er -3dB)............................. 10Hz÷60KHz

Input Sensitivity: ...............(0dB) .................................................. 0.775VRMS

Input Impedance: ..............(balanced) ........................................... 30KΩ

.......................................(unbalanced) ....................................... 15KΩ

Voltage Gain: .............................................................................. 32±1dB

IMD: ................................ (SMPTE 60Hz/7KHz 4:1)........................ <0.1%

THD: ...............................(THD+N) ............................................. <0.1%

S/N Ratio: ........................(unweighted) ....................................... >100dB

*Note: measured with the limiter enabled.

Remarks

• This is a bi-ampliﬁ ed speaker, the more powerful ampliﬁ er is for the low frequency range (woofer), the less powerful ampliﬁ er is for the high frequency range (compression HF driver).

• The power supply of the ﬁ rst ampliﬁ er utilizes a dual bipolar DC rail conﬁ guration with low and high voltages; one positive and one negative low rail (+/-Vcc1) and one positive and one negative high rail (+/-Vcc2). The second ampliﬁ er is supplied by means the onlylow rail (+/-Vcc1).

Setup

• Verify, with the Multimeter, the insulation between the heatsink and the transistors collectors. Also see Advices section.

• Verify, with the Multimeter, the PTC resistor value (TH1), it must be between 50Ω and 200Ω.

• Connect the Variac between the mains and the ampliﬁ er and set it at zero voltage.

• Connect the audio generator to the channel input and set it to 2kHz 775mVRMS (0dB) sinusoidal signal.

• Place the temperature sensor between heatsink and the PTC (TH1).

• Connect the CH1 scope GND clip to CN1 pin 1 (SGND terminal) and the probe tip to R60 side RL1 (LF PWR out), set it to 20V/div. 1mS/div.

• Connect the CH2 probe tip to R260 side IC202 (HF PWR out) and set its sensitivity at 20V/div.

• Set the LEVEL potentiometer full clockwise.

• The load resistor is disconnected.

• The procedures that follow must be executed subsequently in the order speciﬁ ed.

Supply Check

• Remove the transformer secondary fuses (located on SUPPLY board), set the Variac to the nominal mains voltage, check with the Multimeter the AC supply voltages:

F1-F2=86±2Vac F4-F5=62±1.5Vac.

• Re-set the Variac at zero voltage, turn off the ampliﬁ er and put the fuses back on its holders.

• Set up the Variac slowly monitoring the Outputs with the oscilloscope CH1 and CH2 connected, starts from 2/3 of nominal mains voltage it should display the sinusoidal input signal ampliﬁ ed with no distortions, if a distortion occur or the protection trips check the AMPLIFIER board as suggested in the ADVICES section.

• Finally verify the DC supplies on SUPPLY board: CN1 pin 2 (+Vcc2) =+60±2Vdc CN2 pin 3 (+Vcc1) =+43±1.5Vdc CN2 pin 1 (-Vcc1) =-43±1.5Vdc CN2 pin 2 (-Vcc2) =-60±2Vdc CN1 pin 4 =+15±1Vdc CN1 pin 5 =-15±1Vdc

• If one or more voltages don’t correspond, check the rectiﬁ ers, capacitors and transformers disconnecting them from circuitry, refer to schematics.

Low Frequency Channel Check

• Set the audio generator to 500Hz 775mVRMS (0dB) sinusoidal signal.

• Connect the CH2 probe tip to D22 cathode and set its sensitivity at 20V/div.

LOW RAIL VOLTAGE AMPLIFICATION TEST:

• Increase slowly the Variac. The channel output signals must be symmetrical respect the GND without visible distortion and oscillation as shown in Fig.1 Trace A (Trace B shown the ampliﬁ er 2nd stage input R58 side C28). If there is a distortion read the section ADVICES.

HIGH RAIL VOLTAGE AMPLIFICATION TEST:

• When the output signal (Positive half-wave) is less than 34Vp the voltage on D22 cathode must remain constant at 40V, when the output signal exceeds 34Vp the voltage must follow the output signal with 6V offset (see Fig.2 Trace B), to check the negative high rail connect the probe to D26 anode (see Fig.2 Trace C).

LOAD CURRENT TEST:

• Connect the 4Ω 500W load on the output and repeat the LOW RAIL and HIGH RAIL tests.

LIMITER CHECK:

• Increase the input signal of 10 dB and verify the output voltage and wave shape remain constant.

BIAS ADJUSTMENT:

• With resistive load connected wait until the temperature reach 50°c.

• Set the level at zero, connect the Multimeter across the resistors R60, then adjust VR1 trimmer to read 6±0.1mVdc.

BANDWIDTH CHECK:

• Disconnect the load. Set the generator at -10dB, sweeping the generator frequency from 10Hz to 10kHz the level changes accordingly Figure 4 (1a).

OFFSET SENSOR CHECK:

• Set the Variac to zero voltage output, disconnect resistive load from the ampliﬁ er output, connect temporarily (by means of a suitable conductor wire) CN1 pin 4 (+15Vdc) to R72 side RL1, the protection circuitry (Q14,15,16) detect the DC voltage and open the output relay (RL1) within 3 seconds approx.

• Remove the connection, wait until the relay switch on and after some seconds repeat the check with -15Vdc (available on CN1 pin 5), the protection circuitry must open the relay again.

SIGNAL TO NOISE RATIO CHECK:

• Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket shorted) the output signal (noise) must be less than 1mV.

High Frequency Channel Check

• Verify, with the Multimeter, the insulation between the heatsink and the TDA7294 case.

• Set the audio generator to 5KHz 775mVRMS (0dB) sinusoidal signal.

• Connect the CH2 probe tip to R260 side IC202 (HF PWR out) and set its sensitivity at 20V/div. 200µS/div.

VOLTAGE AMPLIFICATION TEST:

• Increase slowly the Variac. The channel output signals must be symmetrical respect the GND without visible distortion and oscillation. If there is a distortion replace the TDA7294.

LOAD CURRENT TEST:

• Connect the 8Ω 500W load on the output and repeat the test.

LIMITER CHECK:

• Increase the input signal of 10 dB and verify the output voltage and wave shape remain constant.

BANDWIDTH CHECK:

• Disconnect the load. Set the generator at -10dB, sweeping the generator frequency from 10Hz to 10kHz the level changes accordingly Figure 4 (1b).

SIGNAL TO NOISE RATIO CHECK:

• Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket shorted) the output signal (noise) must be less than 1mV.

H350A CHECKING & ADJUSTMENTS

The following adjustment and notes are relative to these models only.

Technical Specifications

Dimensions: .....................H350A (WxHxD) ................................... 455x790x405mm

Weight: ............................H350A ................................................ 33.5Kg

Power Requirements: .........(230Vac±10% 50Hz) ............................ 310VA

.......................................(115Vac±10% 50/60Hz) ....................... 310VA

Output Power*: .................(4Ω/8Ω) .............................................. 230W/80W

Max.Undistorted Out*: .......(4Ω/8Ω) .............................................. 85Vpp/71Vpp

Active crossover: ...............(frequency Hz @ slope dB/oct.) .............. 600@18/18

Sensitivity: .......................H350A (1W/1m) ................................... 96.7dBSPL

Max SPL: ..........................H350A (continuous) .............................. 121dBSPL

.......................................H350A (peak) ...................................... 124dBSPL

Frequency Response ..........(ampliﬁ er+speaker) .............................. 38Hz÷20KHz