I got an opportunity to build for my friend an Advance TL Floor Stander with the Dayton Reference Woofers (7" Aluminium cone) and Tweeter (1" Silk Dome). The box design was completed and a the box build (90% complete) - Images as below.
Also i have completed the design of the cross-over network which is 1st order Butterworth - zero phase shift Phase Coherent system. The crossover frequency is exactly 1800 Hz which is the distance between the woofer and tweeter center (7.5").
Frequency response is flat in the simulation and shows the crossover at 1800 Hz. The load is more or less capacitive with this crossover. The impedance falls with increasing frequency. This is because the woofer is 8 ohms and the tweeter is 4 ohms. The simulation shows a gradual roll-off for the highs from 10KHz onward. This will allow a very mellow and soothing highs eliminating listening fatigue. It will be interesting to note how the baffle step will effect this roll-off.
The maximum phase angle with the tweeter is still 36 deg with the simulation. The min impedance is 3.2 ohms from 7kHz onwards which is okay as the angle is not too deep. This was required for compensating the tweeter for phase coherence and remove the phase errors.
The phase shift is zero degree for the filter considering the system phases. Individual low pass and high pass phase shows around 10 deg phase shift near the crossover region which was the minimum i could design.
Tweeter Reverse connected / Woofer and Tweeter Reverse connected:
The system phase shows accurate crossover and phase linearity and behavior.
Overall i am satisfied with the simulation. The built should be completed within next one / two weeks and then the measurements should follow to compare the simulated and measured results. I am planning to build the crossover with less than 1% component tolerance. Unfortunately none of the values are standard and will have to be custom made for minimum tolerance there by increase time, effort and cost.
For listening impressions after build - stay tuned.
Also i have completed the design of the cross-over network which is 1st order Butterworth - zero phase shift Phase Coherent system. The crossover frequency is exactly 1800 Hz which is the distance between the woofer and tweeter center (7.5").
Frequency response is flat in the simulation and shows the crossover at 1800 Hz. The load is more or less capacitive with this crossover. The impedance falls with increasing frequency. This is because the woofer is 8 ohms and the tweeter is 4 ohms. The simulation shows a gradual roll-off for the highs from 10KHz onward. This will allow a very mellow and soothing highs eliminating listening fatigue. It will be interesting to note how the baffle step will effect this roll-off.
The maximum phase angle with the tweeter is still 36 deg with the simulation. The min impedance is 3.2 ohms from 7kHz onwards which is okay as the angle is not too deep. This was required for compensating the tweeter for phase coherence and remove the phase errors.
The phase shift is zero degree for the filter considering the system phases. Individual low pass and high pass phase shows around 10 deg phase shift near the crossover region which was the minimum i could design.
Tweeter Reverse connected / Woofer and Tweeter Reverse connected:
The system phase shows accurate crossover and phase linearity and behavior.
Overall i am satisfied with the simulation. The built should be completed within next one / two weeks and then the measurements should follow to compare the simulated and measured results. I am planning to build the crossover with less than 1% component tolerance. Unfortunately none of the values are standard and will have to be custom made for minimum tolerance there by increase time, effort and cost.
For listening impressions after build - stay tuned.
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