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  1. P

    PMA - 60; New arrayable double 12 and horn.

    So, why build & lug 4 cabinets if 2 PM90s can do the job. 😉
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    60 Degree DIY Mid Hi - AKA PM60

    Jan Jaap, exactly, with the 18 sound horn it is an even tighter fit. Even if the diameter of the dcx driver would fit, there is still the risk of hitting the dcx with the 12” membranes. edit: Max, our posts crossed ;-)
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    60 Degree DIY Mid Hi - AKA PM60

    Ok. How far is the DCX driver from the 12” membrane? The xmax/xmech of these drivers is quite large...
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    Double 15” and Horn Drum Fill

    👍 Also try a half space measurement (with mic and speaker on the ground) to verify the result (there might be some back reflections in the low mid in your measurement). BTW: What is your ‘achternaam’? 😉
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    Double 10 and Horn

    Did you put the box on its side on the ground? Can still be a travel distance between the two 10” drivers. Also put the mic exactly on-axis.
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    Double 10 and Horn

    Probably because you’re measuring not close enough or not far enough from the ground. In other words: this could be caused by ground reflections and the difference in travel time between the direct sound and the reflections. Try to measure half space with the mic (and speaker) on the ground.
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    60 Degree DIY Mid Hi - AKA PM60

    Should work fine. I’m using the Powersoft DSP lite (no FIR, just IIR with all-pass) combined with digimod amps. I can do SMAART measurements and create settings, but currently very busy. In a couple of months I should have more time...
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    New DIY Mid High (90deg) - AKA PM90

    Aha, I see. Because you asked about the impedance of the middrivers, I assumed that you wanted to use a passive x-over from mid to hf/vhf. But now I understand you intend to use a passive x-over for hf to vhf only. That should work fine: I’m using the passive x-over as well on the BMS. You can...
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    New DIY Mid High (90deg) - AKA PM90

    Passive from mids to hf/vhf? I don’t recommend doing that. The mids need quite some processing to play nicely with the bms. You can get an amp for the money of the passive x-over these days. I recommend 8 Ohm mid drivers (4 Ohm per cabinet): 8 Ohm recones are much easier to get and it further...
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    New DIY Mid High (90deg) - AKA PM90

    Hey, that’s funny. I have the exact same combination: TH18/118 + PM90. The TH118 seems to have just enough punch to keep up with the PM90 (for general band/weekend warrior stuff). I made the subs active with Powersoft plateamps which also power the tops (4 channels: 3kW sub bridged, 1.5kW mid...
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    60 Degree DIY Mid Hi - AKA PM60

    Aha, found it, but turns out it was the RCF ND950... https://soundforums.net/community/threads/new-diy-mid-high-90deg.11601/post-205972
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    60 Degree DIY Mid Hi - AKA PM60

    I think there was someone in Germany that used these drivers as cheaper alternative to the BMS drivers.
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    60 Degree DIY Mid Hi - AKA PM60

    And why is this WPL at least 20kg heavier than the PM60/90?
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    New DIY Mid High (90deg) - AKA PM90

    Yes, they are still my favourites: Thanks Peter, for sharing this design ;-)
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    New DIY Mid High (90deg) - AKA PM90

    Drawings are here: https://www.dropbox.com/s/h16is6mbjig6fcy/pm90_current.pdf?dl=0 I built a slightly adapted version of the PM90 and it’s in use for a couple of years now. I like mixing on them a lot. :-) Regards, Peter ... also from the Netherlands...
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    60 Degree DIY Mid Hi - AKA PM60

    The first way of working (making the angle of the cuts the same at both sides) is not more difficult than what Peter Morris proposes: Start with a piece of ply cut to the width of the cabinet. After cutting the first part, simply flipover the remaining piece of ply and the first cut is already...
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    8 Inch Coaixial Build

    Yes, I think all types. The response will differ per type LR/BW/BS, but it will have peaks and dips because of the delay in the high driver and the relatively large overlap in output of the drivers around the x-over frequency. I have dips/peaks of +/- 6 dB from 2 up to 10 kHz. I have one idea...
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    New DIY Mid High (90deg) - AKA PM90

    After some tweaking I got the response as depicted below. This was measured using REW in a room, so full of reflections. I had to apply IR windows which affect the low freq data somewhat. Quite happy with the phase response now (note: with IIR non-lineair phase filters, DCX2496). Settings: MID...
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    New DIY Mid High (90deg) - AKA PM90

    Two of them ready to be measured in Holland! Can't wait for the results. :-)
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    New DIY Mid High (90deg) - AKA PM90

    1 DIY up and running. Rock solid on a stick. Even with simple guessed IIR settings the sound is already stunning. Only 1 problem: I don't have enough sub to keep up... :-) but first let's build the other one...