I have been a member of this forum for quite sometimes, but a lurker and have not contributed much. This is a really great place and I'm an avvid reader of driver-related posts (Thanks johnmarsh, mark, zaph, augerpro...!).
So please let me share this one. This build is an attempt to refine my live system, the S12 which I have been enjoying so much. They do many things right despite their obvious limitations. They are 3-way active system using analog crossovers. I had many attempts before, some are more ridiculous than others :lol:
The S14 build will try to address cone breakup which I can hear/feel with certain material. The M-T xo point is 1.5khz is not low enough to avoid L21's 4.5khz resonance. There are 2 ways to address this problem: use more expensive drivers, or the cheaper option: insert a smaller mid in between. My wallet has veto power
So the general idea is to have an active 4-way design with target acoustic response @1m as follows:
The woofers are 4x Jaycar CW2119 which despite their low cost at $12 are surprisingly usable for this application. I actually found the one pair on the kerb :T . They will be crossed at 160hz, with low-end rolloff of 40hz and Q=0.5. Giving -6db response at 20Hz (yes it works, just not too loud). The natural Q of 0.75 needing LT circuit.
Seas L21 are used in the 160hz-700hz range. They sound very transparent, even much better than the smaller mids (P13WH). But not so great at above 900hz. The sonics are coloured on right material such as speech. Which I am trying to fix here. Obtained second hand from a member here. The frequency range is where dipole peak occurs so there will be a -6db notch and corresponding low-shelving filters.
From 700hz - 1.5khz, a pair of 5" mids will take over. I have P13WH's which I was not happy when run from 200hz-1.5khz but hopefully will do with narrower frequency range. I really want to have Zaph ZA14 as drop-in replacement and see how they will perform in open baffle application. I can only see good things with this W15 killer :T
I have mixed feeling whether it's best for the L21 or the P13/ZA14 to be in the dipole peak region.
High frequency job is trusted to four Vifa DX25 back-to-back. They can be crossed low without spending $300 x4 for them Milleniums but I have to live with the laid-back extreme highs. I may be able to fix this via response shaping in the xo.
The xo will utilise the audiophile-grade TL072 op-amps :B with all bell and whistle like time alignment. Amps will be 8x gainclones. The whole cost of the system should be sub-$600 including the amps. Let me know what you think of this plan ! 8)
So please let me share this one. This build is an attempt to refine my live system, the S12 which I have been enjoying so much. They do many things right despite their obvious limitations. They are 3-way active system using analog crossovers. I had many attempts before, some are more ridiculous than others :lol:
The S14 build will try to address cone breakup which I can hear/feel with certain material. The M-T xo point is 1.5khz is not low enough to avoid L21's 4.5khz resonance. There are 2 ways to address this problem: use more expensive drivers, or the cheaper option: insert a smaller mid in between. My wallet has veto power
So the general idea is to have an active 4-way design with target acoustic response @1m as follows:
The woofers are 4x Jaycar CW2119 which despite their low cost at $12 are surprisingly usable for this application. I actually found the one pair on the kerb :T . They will be crossed at 160hz, with low-end rolloff of 40hz and Q=0.5. Giving -6db response at 20Hz (yes it works, just not too loud). The natural Q of 0.75 needing LT circuit.
Seas L21 are used in the 160hz-700hz range. They sound very transparent, even much better than the smaller mids (P13WH). But not so great at above 900hz. The sonics are coloured on right material such as speech. Which I am trying to fix here. Obtained second hand from a member here. The frequency range is where dipole peak occurs so there will be a -6db notch and corresponding low-shelving filters.
From 700hz - 1.5khz, a pair of 5" mids will take over. I have P13WH's which I was not happy when run from 200hz-1.5khz but hopefully will do with narrower frequency range. I really want to have Zaph ZA14 as drop-in replacement and see how they will perform in open baffle application. I can only see good things with this W15 killer :T
I have mixed feeling whether it's best for the L21 or the P13/ZA14 to be in the dipole peak region.
High frequency job is trusted to four Vifa DX25 back-to-back. They can be crossed low without spending $300 x4 for them Milleniums but I have to live with the laid-back extreme highs. I may be able to fix this via response shaping in the xo.
The xo will utilise the audiophile-grade TL072 op-amps :B with all bell and whistle like time alignment. Amps will be 8x gainclones. The whole cost of the system should be sub-$600 including the amps. Let me know what you think of this plan ! 8)
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