Content Management Index
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 | | 85 SMD
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 | This graphic shows the clock signal in your player,
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 | The Clock signal from the LClock is much
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A PWM 'Digital' amplifier solution that simply works!
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A PWM 'Digital' amplifier solution that simply works!
Click to enlarge Photo.
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Click to enlarge Photo.
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Click! | The 2 way active xover board has been discontinued. This page is for existing owners who want to reconfigure and experiment with the filter frequencies, slopes etc.
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Click! | The 2 way active xover board has been discontinued. This page is for existing owners who want to reconfigure and experiment with the filter frequencies, slopes etc.
Click! | | This is the basic setup of an active X-Over system. Each speaker unit is connected DIRECTLY to the output of an amplifier, with no x-over components in the signal path. You need 4 amplifier channels to drive a complete system. 2 Channels for high section can be low power, and the bass amplifier only needs to have goiod sound in the bass regions, but bigger output power. The division of tone frequencies is done before the power amplifier rather than after, as is the case in a passive x-over setup. There are many advantages: The driver units see a constant low impedance from the amplifier, in a passive x-over the impedance is typically very high in the x-over frequency range, so there is no damping factor at all. You can adjust the level of each driver separately without loss of sound quality. Real high quality capacitors cost around 1$ for this type of filter, it would cost 100-200$ for a passive filter.
The sound of this setup is incredible! |
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Click! | This is the basic setup of an active X-Over system. Each speaker unit is connected DIRECTLY to the output of an amplifier, with no x-over components in the signal path. You need 4 amplifier channels to drive a complete system. 2 Channels for high section can be low power, and the bass amplifier only needs to have goiod sound in the bass regions, but bigger output power. The division of tone frequencies is done before the power amplifier rather than after, as is the case in a passive x-over setup. There are many advantages: The driver units see a constant low impedance from the amplifier, in a passive x-over the impedance is typically very high in the x-over frequency range, so there is no damping factor at all. You can adjust the level of each driver separately without loss of sound quality. Real high quality capacitors cost around 1$ for this type of filter, it would cost 100-200$ for a passive filter.
The sound of this setup is incredible! |
Click! | The BLUE curve shown natural roll off of this typical 14 liter speaker. The ORANGE curve shows the corrected bass signal, adapted for this particular speaker. The bass rolloff is inverted in the signal until -9dB, then the lower frequencies are cutt off with a 12dB/oct low cut filter. The GREEN curve shows the resulting bass performance of this speaker. You can correct even further, depending on the only tradeoff in this method: available amplifier power. With modern power amplifiers like ZAPpulse Power should not be a problem though.
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Click! | | The BLUE curve shown natural roll off of this typical 14 liter speaker. The ORANGE curve shows the corrected bass signal, adapted for this particular speaker. The bass rolloff is inverted in the signal until -9dB, then the lower frequencies are cutt off with a 12dB/oct low cut filter. The GREEN curve shows the resulting bass performance of this speaker. You can correct even further, depending on the only tradeoff in this method: available amplifier power. With modern power amplifiers like ZAPpulse Power should not be a problem though.
Click! | | Here is a sample setup of an active X-over filter setup. The Filter board, and 4 ZAPpulse modules with a power supply make up a complete system to drive the speaker directly. The drivers used here are the Scanspeak 15W8530-00 and the Scan Speak Revelator D2905-990000 tweeter. For the tweeter we used ZAPpulse 2.1 Special Edition for best sound quality, and for the bass'es we used ZAPpulse 2.1 standard modules, as they perform great at lower frequencies. This sounds amazing!
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Click! | | Here is a sample setup of an active X-over filter setup. The Filter board, and 4 ZAPpulse modules with a power supply make up a complete system to drive the speaker directly. The drivers used here are the Scanspeak 15W8530-00 and the Scan Speak Revelator D2905-990000 tweeter. For the tweeter we used ZAPpulse 2.1 Special Edition for best sound quality, and for the bass'es we used ZAPpulse 2.1 standard modules, as they perform great at lower frequencies. This sounds amazing!
The Low Pass section for a 24dB/oct. filter. Note OPA2134 shown here, but we use NE5532 for this section.
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The Low Pass section for a 24dB/oct. filter. Note OPA2134 shown here, but we use NE5532 for this section.
The High Pass section in our filter is made with single end Class A buffers.
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The High Pass section in our filter is made with single end Class A buffers.
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Op-amp'ens ben numre.
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Op-amp'ens ben numre.
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 | +12V from
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 | The typical circuit in your player
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 | Remove the
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 | Then the clock
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 | The circuit in your player before LClock XO3
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 | Remove the crystal and two
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 | Then connect the clock feed
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 | Alternative connection in players with 74HCU04. In
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Pin numbering of the op-amp.
If the supply is OK, a
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Pin numbering of the op-amp.
If the supply is OK, a
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| Here is the circuit before the
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 | This is how it's usually done. |
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But this way is better. Use a 10 - 100n PP or MICA
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Click! Click! Connection
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Click! Click! Connection
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Click to enlarge!
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The Soft Start module, solder side.
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The Soft Start module, solder side.
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