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Thread: WTD. Large Horn Speakers Altec or JBL

  1. #61
    Join Date: Mar 2009

    Location: The New Forest

    Posts: 1,861
    I'm Steve.

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    Used to be vertical in previous house



    I'll play the Monty Python theme tune on them next time.

    If you are a DIY'er & have the time, you can build it up over time.
    Really nice drivers can get expensive though. Amps and DSP to control not too bad.
    I mostly stream with Qobuz.
    System: Turntable : SP10 MKII slate plinth, Custom Ebony tonearm board, Arm : Fidelity Research FR64s, Cartridge : SPU Royal N. SUT : Lundahl 1:13. Phonostage : Icon Audio, Streaming RPi/Kali reclocker -> I2S -> DSP XO / Pre / 4 DAC's : WAF Najda, 5 Poweramps : 3 x EL84 SET's, 2 x D class amps on bass channels, Speakers : 5 way front loaded horn system: 2 X Tapped sub 15" LF drivers / 2 X Exponential mid bass 15" drivers / Tractrix 200Hz mid horns with JBL2482's, / Tractrix 550Hz upper wooden horns with factory refurb'd Vitavox S2's / Raal Lazy Ribbons as high frequency tweeters. Wires: good silver or good copper where best suited. DIY RCM.

    Maker of tonearm boards, armpods, Tannoy GRF style speaker cabinets, horn speakers, counterweights and more.
    For more information about my creations and products please click below

    http://fosworld.wixsite.com/magna-audio & on Instagram https://www.instagram.com/magna_audio/

  2. #62
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 6,878
    I'm Lawrence.

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    I had to look at tapped horn as, although I've heard of them, I didn't know what they were. It seems it involves delaying the output of the rear wave to be in phase with the front wave at some frequency to supplement the output. This sounds like an transmission line to me, is there a conceptual difference?

    (I don't want to hijack the thread but it does seem relevant to the question, so just a simple explanation will suffice please, not a debate about the pros and cons!)

  3. #63
    Join Date: Mar 2009

    Location: The New Forest

    Posts: 1,861
    I'm Steve.

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    Quote Originally Posted by Lawrence001 View Post
    I had to look at tapped horn as, although I've heard of them, I didn't know what they were. It seems it involves delaying the output of the rear wave to be in phase with the front wave at some frequency to supplement the output. This sounds like an transmission line to me, is there a conceptual difference?

    (I don't want to hijack the thread but it does seem relevant to the question, so just a simple explanation will suffice please, not a debate about the pros and cons!)
    Pretty much spot on description
    To my mind they differ to TL designs in that with the tapped horn the front pressure wave (large cone speaker in compression driver application) joins forces in the same physical space as the rear pressure wave.
    Once joined, they share the same final horn exit section.
    The back sound pressure wave neatly fills in a common dip in dB you find in other back loaded systems and there is no difference in time alignment (front and rear) since they are timed to join forces.

    They are good for 20-100'ish Hz flat.
    Minne are 105dB/W.
    I use them with a LR 6th order X/O at 90Hz.
    I did initially have them on 2nd order passives (BIG inductors and capacitors and Zobel required).
    Like that at Scalford 2012 (was it?).
    Some power amps can do all that though these days.
    I used Antimode room correction back then. Helped with room modes you get in normal sized rooms.
    Now I use an active DSP solution and time align all channels.

    Danley Sound Labs was the inventor/pioneer.
    He is truly innovative.

    These days I have them on a heavy Cerwin Vega 500wpc into 8 ohms power amp >250 damping factor. Earlier on I was under controlling them!
    Although maximum cone excursion is only 1.6mm at 105dB in the tapped horns, you need very fast move and stop, and fast move control.
    Choosing the right driver for a tapped horn is key.
    It's the type of amp you would never use on Hi-fi mid range or normal speaker frequencies.
    On deep bass, no problem.

    You can't really talk horns without getting into the knitty gritty and derailing

    I'm loosely trying to work out if I could build a Western Electric 12a type, wide frequency mid range horn..
    Could range from 80Hz to 8000Hz or more, with the right driver, but they are pretty big! That would only be a 3 way still use the Raal tweeters on top.
    Not sure I'd get the grunt of the long exponential mid bass horns with 12"drivers, or e punch of the JBL 2482 large compression drivers on the mids, or the speed and tone of the Vitavox S2's on upper mid though.
    Everything is a trade off.
    Last edited by Magna Audio; 11-04-2021 at 16:10.
    System: Turntable : SP10 MKII slate plinth, Custom Ebony tonearm board, Arm : Fidelity Research FR64s, Cartridge : SPU Royal N. SUT : Lundahl 1:13. Phonostage : Icon Audio, Streaming RPi/Kali reclocker -> I2S -> DSP XO / Pre / 4 DAC's : WAF Najda, 5 Poweramps : 3 x EL84 SET's, 2 x D class amps on bass channels, Speakers : 5 way front loaded horn system: 2 X Tapped sub 15" LF drivers / 2 X Exponential mid bass 15" drivers / Tractrix 200Hz mid horns with JBL2482's, / Tractrix 550Hz upper wooden horns with factory refurb'd Vitavox S2's / Raal Lazy Ribbons as high frequency tweeters. Wires: good silver or good copper where best suited. DIY RCM.

    Maker of tonearm boards, armpods, Tannoy GRF style speaker cabinets, horn speakers, counterweights and more.
    For more information about my creations and products please click below

    http://fosworld.wixsite.com/magna-audio & on Instagram https://www.instagram.com/magna_audio/

  4. #64
    Join Date: Jan 2011

    Location: Brighton UK

    Posts: 210
    I'm Jamie.

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    I noticed you mentioned you were considering Club Amy. I’m contemplating moving on my much nicer Bastanis Wildhorn originally commissioned by the UK dealer at the time for demo purposes.

    They’re DIY but definitely on the professional side. They are now only available prebuilt from Bastanis for £10k and these are the same without the fancy veneer

    Scroll down here a little way on this thread, and there’s a nice pic of the actual speaker (with the round tweeter housing) with the dealer DJGROOVYDAWG introducing himself and putting the word out on the range at the time

    https://www.hifiwigwam.com/forum/top...egins/page/10/

    Here’s the ad where he sold them to the guy I bought from recently. not sure why the pics aren’t all loading https://www.hifi-forsale.co.uk/mobil....php?pid=59925

    Would be within your original budget let me know if any interest (am in Portslade Sussex)

    Kind regards
    Jamie

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