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Thread: Best dual concentric

  1. #41
    Join Date: Jul 2009

    Location: Hampshire, UK

    Posts: 3,662
    I'm Adam.

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    Consider looking out for a pair of Goodmans Imagio loudspeakers with their ICT drive unit - they are, strictly speaking, the only true full range driver out there.

    I would also advise caution where 'whizzer' cones are concerned. I generally find they are best off left in the front doors of cars where your ankles absorb the worst of their distortions!
    Engineers: fixing problems you didn't know you had in ways you don't understand.

  2. #42
    Join Date: Dec 2015

    Location: Alicante. Spain.

    Posts: 1,885
    I'm Adrian.

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    They look very interesting...
    Technics SP10 mk2
    Jan Allaerts MC 1 Boron mk1 cart
    Miyajima Shilabe cart
    Hashimoto HM-X SUT
    Siggwan (gimballed not unipivot) Cocobola 12"
    Aurorasound Vida LCR Phonostage
    The Truth linestage
    Dave Slagle Autoformer Volume Controller
    Cary 805c SET amps
    Audio Note ANe-SPX speakers
    Townshend Isolda speaker cables
    Cardas Golden Presence interconnects

  3. #43
    Join Date: Oct 2012

    Location: NE England

    Posts: 4,173
    I'm Jez.

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    Whilst not a fan of the full range drive unit generally I was reasonably impressed by a pair of Goodmans axiom speakers a year or so ago... They could have done with a conventional tweeter taking at say 8-10KHz though IMHO as, whilst not disastrously so, the top end was audibly down on what it should have been...
    Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)

    Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
    ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
    Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
    Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco

  4. #44
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,481
    I'm Alex.

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    I still have a pair of the original Axiettes, not bad full range, put a soft dome tweeter with them using just a single 2uf capacitor as the crossover. A lot of the better Goodmans units were designed by Ted Jordan, later started up his own company, Jordan Watts.
    Spendorman

  5. #45
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

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    Don't need a tweeter with my telefunkens
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***SMILE, BE HAPPY***

  6. #46
    Join Date: Mar 2016

    Location: South Africa

    Posts: 38
    I'm Ari.

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    Quote Originally Posted by struth View Post
    Don't need a tweeter with my telefunkens
    How's about a pic of those telefunkens please Struth ! I've never seen them .

    I recently purchased a pair of Goodman Twin Axiom 10's in solid pine boxes with yellow wood framing the funky front grille clothe . The box appears to be the original design for the 10's by Goodman . Round hole for port cut in front baffle with ~shoebox size box as a port inside the bigger box . Something like the 2nd design on this flyer :



    I've got them driven by Pioneer SM-83 in my workshop , they sound amazing . I push the bass on the SM-83 to 3 o'clock , and reduce treble to 11 o'clock ( where 12 o"clock is flat ) and it then sounds fine . With both flat it can sound a little screechy . Perhaps , when I have time again , I can measure and make a notch filter . but I really am quite happy with the treble a notch down and the bass up - they seem quite efficient too .

    A couple of years ago ( probably 7 ) in South Africa a pair of Tannoy Monitor Gold 10's , unused in original boxes , with original crossovers , sold for the equivalent of $500 . I can seriously kick myself for not buying them , they were available for a couple of weeks at that time too . I uhmmed and aahhed about it all too long , and then they were gone .

    Looked something like this ( although these could be 12" or 15" )




    http://www.troelsgravesen.dk/Tannoy_IIILZ.htm
    Last edited by Ari; 15-05-2017 at 01:20.

  7. #47
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

    Default

    There is some. In here of the finished article. Will have look for one of a driver
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***SMILE, BE HAPPY***

  8. #48
    Join Date: May 2016

    Location: Notts

    Posts: 2,741
    I'm Geoff.

    Default

    I think one needs to make judgements about full-range drivers on an empirical basis rather than making generalisations about "shouty" whizzers and excessively rolled-off treble. Yes some full range drivers do have these flaws but not all do.

    Listen first: then judge!

    Geoff


  9. #49
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

    Default Best dual concentric

    Quote Originally Posted by struth View Post
    There is some. In here of the finished article. Will have look for one of a driver
    these are 10" drivers









    last one is inside the single drivers I did first. still sweet and must try them again soon
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***SMILE, BE HAPPY***

  10. #50
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,861
    I'm Dennis.

    Default

    Ari I ask a favour of you regarding the picture above of a corner reflex cabinet.

    When I was about 9 my Father built a corner reflex which looks very similar to the one on the left in you picture above, but it was for a Godmans 12" unit with a whizzer, and its front panel port opening was up from the base by about 6".

    He built the cabinet with the port, up from the bottom by maybe 6", and I believe that he inverted the box attached to the rear of the front panel so that its opening was pointing up to the driver rather than down to the bottom. This I think he did on on the misconception that by having the open end of the port box which had one 'end' missing, upwards instead of downwards, it would 'allow the sound out better'.

    Of course it would which ever way up work as a reflex for bass frequencies, but with it upwards the rear cone mid range would also be allowed out, and this is undesired. So I have a question which you may be able to answer.

    Do you have any references or diagrams showing a similar corner box but for a 12" unit that will allow me to determine which way up the box should have been placed?

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