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Peter Morris
Senior
Last Activity: Today, 07:10 AM
Joined: 05-08-2011
Location: Australia
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  • Peter Morris
    replied to 8 Inch Coaixial Build
    This 6" coaxial design may be of some interest and the passive crossovers to suit both 5" & 6".

    https://www.beyma.com/uploads/descargas/1353671386.pdf

    htt...
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    Last edited by Peter Morris; Today, 07:10 AM.

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  • Peter Morris
    replied to New DIY Mid High
    Hi Bennett,

    The DE1090TN looks very interesting and I would love to try some. In this case the cut-off frequency I was referring to was the horn flare.

    FWIW I'm crossing my...
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  • Peter Morris
    replied to FIR filters
    5 - As a result of the pre-conditioning the peak is reduced (2nd diagram on the bottom); however once processed by the crossover (which has the opposite pre-conditioning / phase) the peak and wave shape...
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    Last edited by Peter Morris; 04-18-2017, 09:11 AM.

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  • Peter Morris
    replied to FIR filters
    This diagram may help explain what Phil was talking about. (assuming an IIR crossover)...
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  • Peter Morris
    replied to 8 Inch Coaixial Build
    I think a coaxial 6” or 8” would make a great front fill. Do you have a passive crossover design for that driver?
    Building the correct crossover and getting the amplitude and phase correct is not...
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  • Peter Morris
    replied to 60 Degree DIY Mid Hi
    Hi Jim,

    A 24 dB per octave Linkwitz–Riley filter is constructed by cascading two second order (12dB) Butterworth filters.

    In this case there are two ways to achieve this; EQ...
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    Last edited by Peter Morris; 04-07-2017, 08:19 AM.

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  • Peter Morris
    replied to New DIY Mid High
    I think 600 Hz is getting a bit low for that driver on the HF950 horn ... The HF950 has a cut off frequency of 400Hz and you are getting close. I do not have any figures on the acoustic impedance of the...
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  • Peter Morris
    replied to New DIY Mid High
    I think you will find only a very small difference between the B&C and RCF 12" drivers. I'm not sure you will notice much of a difference.

    Also if you try the ND950 its diameter...
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  • Peter Morris
    replied to New DIY Mid High
    AFAIK, RCF use the HF950 horn in their new TT5A and TT2A. The TT5A uses the ND950 compression driver and the TT2A uses ND850.

    The TT5A crossover is 650Hz, the TT2a is 750Hz.

    ...
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  • Peter Morris
    replied to New DIY Mid High
    I used the 12NDL76 in my 60 degree boxes, its a little difficult to compare as my 60 degree boxes have a slightly longer mid horn than the original PM90's. This was to accommodate the extra length of...
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  • Peter Morris
    replied to 18 sound design
    Absolutely :-) - the triangular corner port design helps but there is a LOT more needed.

    BTW the "No compromise front loaded double 18" cab" that Luke built is essentially...
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  • Peter Morris
    replied to 60 Degree DIY Mid Hi
    I’m using the following crossover points -
    • 100Hz 24dB LR IIR
    • 650Hz 24dB LR FIR for the 60 degree box and 700Hz for the 90 degree. Depending on how loud you need to go you can lower the crossover
    ...
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