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Thread: Someone to do a crossover design?

  1. #1
    Join Date: Jun 2012

    Location: Tamborine Mtn, Australia

    Posts: 231
    I'm Hal.

    Default Someone to do a crossover design?

    I intend using a seas 5.5" paper/reed driver, the ER15RLY, with a fountek neo x 2 ribbon tweeter in a small ported bookshelf type speaker. I can design the and build the speaker, but designing the crossover is something I really don't want to tackle. Are there any suggestions for a person or firm that can be recommended to do this work, and at reasonable cost. I don't expect anyone to work for nothing, but similarly I don't want to pay a Kings ransom either. Madisound advertises such a service on their website at most reasonable cost but I believe their designer has since retired.
    Without music, powerboat racing, photography and a whole stack of other stuff that floats my boat, life is just a non stop procession of deadlines and bills.

  2. #2
    Join Date: Feb 2016

    Location: Melksham, Wiltshire

    Posts: 483
    I'm Peter.

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    Reffc (Paul) of this parish may be able to assist. No idea how much he would charge. The only thing to do ..... is ask. He most certainly is very capable.

    If no answer on the Forum, drop me a PM and Iíll let you have his email.

    Peter


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  3. #3
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,206
    I'm AnDreW.

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    Yep goto paul.
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  4. #4
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 3,295
    I'm Alex.

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    This was a service that Falcon used to provide, but that was decades ago. They did me one for EMI 14"x9" 14A770, KEF B110, Celestion HF1300 and Coles 4001G. I still have Malcolm Jones drawing of that circuit.
    Spendorman

  5. #5
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 35,730
    I'm Geoff.

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    Crossover calculator? https://www.diyaudioandvideo.com/Cal...akerCrossover/

    You'd probably want a third order or higher network with ribbons. Many will tell you that the home constructor can't build a decent crossover, but I do mine.

  6. #6
    Join Date: Apr 2008

    Location: Warrington

    Posts: 2,973
    I'm Neil.

    Default Someone to do a crossover design?

    Those tweeters have high power handling (for a ribbon) ideal for using a 1st order crossover with, which has a certain magic in a two way design IMHO.
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Custom Silent Media Server >> Halide Bridge USB (with AQVOX USB power) >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  7. #7
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 35,730
    I'm Geoff.

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    Quote Originally Posted by Yomanze View Post
    Those tweeters have high power handling (for a ribbon) ideal for using a 1st order crossover with, which has a certain magic in a two way design IMHO.
    Greater risk of intermodulation though. Also, the wide overlap of response between two drivers with very different tonal characteristics could cause some 'oddities' in the sound.

  8. #8
    Join Date: Mar 2010

    Location: Sheffield

    Posts: 2,591
    I'm Simon.

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    i use Ribbons into the mids on my NS1000M, first order, no issues.


    Easily done with basic box and crossover calc tools and a measurement mic and a copy of REW for final in situ testing. if I can do it anyone can.
    Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m

  9. #9
    Join Date: Apr 2011

    Location: cheltenham

    Posts: 396
    I'm matt.

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    Quote Originally Posted by hal55 View Post
    I intend using a seas 5.5" paper/reed driver, the ER15RLY, with a fountek neo x 2 ribbon tweeter in a small ported bookshelf type speaker. I can design the and build the speaker, but designing the crossover is something I really don't want to tackle. Are there any suggestions for a person or firm that can be recommended to do this work, and at reasonable cost. I don't expect anyone to work for nothing, but similarly I don't want to pay a Kings ransom either. Madisound advertises such a service on their website at most reasonable cost but I believe their designer has since retired.

    The very best way to do It would be with measurements of the drivers In the box (Impedance and frequency). It Is possible to trace the graphs from manufacturers data sheets, but I wouldn't fully trust them (manufacturers often massage the frequency response graphs to make them look better than they actually are). There's a guy over at the partsexpress forum that has designed crossovers for people without measurements and they have been happy with the results, so may be worth asking over there.

    Don't waste your time with online calculators.

  10. #10
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,084
    I'm Tom.

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    Another vote for Paul at RFC.

    Donít expect him to busk it though heíll need driver details and box measurement - in fact you might be better off giving him an idea what you are trying to achieve and having him work out the details all round.


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    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers; Amp - Radford STA100; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 / Ikeda IT-407 tonearms; Cartridges Stereo - Miyajima Madake, Ortofon SPU Royal N, Ikeda 9C III, SAEC/Excel C3; Mono - Miyajimas - Zero 0.7, Premium 1.0, Sonovox MC-4 1.0, Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912; Esoteric Sound Re-Equalizer for equalisation of early mono and 78, switchable in from tape loop; Digital: Audio Note CDT2/II transport, heavily modded AN Kit DAC + Mutec MC3+USB.

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