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Thread: Bloody ebay !!!!!!!!!!!!!!!!!!!!! Impulse H2!

  1. #21
    Join Date: May 2012

    Location: Dagenham Essex

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    Quote Originally Posted by Barry View Post
    Impulse H2s are lovely speakers. In fact they are one of the very few folded horn-loaded speakers I can listen to and enjoy.

    A friend of mine has a pair, tri-wired to an Audio Innovations 500 amplifier. They are located about 1/3 of the length of an L-shaped room. According to Jerry. this would appear not to be optimum, but my friend has little option. I can remember hearing that the reviewer Jimmy Hughes found turning the speakers around pointing into the corners improved the sound enormously; presumably the corner was acting as the final part of the horn.

    Anyway, well done on finding yours. They are reasonably tall at around 4', but have a small footprint. What amplifier will you use with them?
    Barry

    Looks like the first amp I will try will be my AD Audio rebuilt AI 500 with all new valves
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

    Also a pishanto specialist confirmed by Head Daftee

    Real name " Allen " or "Zoomer Nut”, “Numpty Napper”.

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  2. #22
    Join Date: May 2012

    Location: Dagenham Essex

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    Impulse H2: Arguably the best of the lot. A derivative of the H1 which appears to have superceded it. Mostly handmade cabinet, same driver complement as H1, but a simplified bass horn folding leads to reduced cabinet volume with negligible loss of sensitivity and extension. Capable of stupendous bass quality and extension - although specified for cutoff at 40Hz, in-room measurements at home show extension flat down to 30Hz, -6dB at c.27Hz. Positioning close to the rear wall is recommended, but this speaker is remarkably unfussy about siting. Tractrix midhorn with driver open to rear and top, inverted-dome tweeter Sensitivity 95dB/W, 8ohm
    Drivers: 8.5" Seas bass; 4.5" Seas mid; Focal tweeter.
    Crossover ponts: 800Hz; 4Khz; 2nd order summed response.
    Size: 1160mm H x 270mm W x 480mm D
    Finishes: Rosewood or Oak with cloth inserts
    Weight: approx 65KG / 140lb each.
    Available: 1991-1996(?); list price c.£2,300
    Reviews: 3 raves to pick from! (note these are all large images - 1024 pixels wide, GIF format, c. 250Kb)

    Jimmy Hughes in the Audiophile, June 1991:Page 1 Page 2 (B&W photo)
    What Hifi?, April 1992: Page 1 Page 2
    What Hifi?, Summary: May 1992: May 92
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

    Also a pishanto specialist confirmed by Head Daftee

    Real name " Allen " or "Zoomer Nut”, “Numpty Napper”.

    ±± KEEP IT REEL

  3. #23
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Well there you go - enjoy!
    Barry

  4. #24
    Join Date: May 2012

    Location: Dagenham Essex

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    Bass: H1, H2, Ta'us
    Seas 21F-WBX: 8.5" diecast magnesium chassis, coated paper cone 21 F-WBX.pdf (944K)
    Note replacements, if required, should have Qts <0.3, Fs <35hz, sensitivity of 93dB (i.e as high as possible!). Suitable drop-in replacements such as the SEAS H333 (CA21REX) are unfortunately no longer in current production, though you might find a fairly close match from Vifa for the 215mm chassis. However - the GOOD NEWS- these units can easily have the foam surround replaced, and you can do it yourself as shown on the the H1/H2/Ta'us bass driver re-foam page
    .
    .Midrange: H2, Ta'us, probably H1 also
    Seas 11F-M: 4.5" doped paper cone, diecast magnesium chassis. 11F-M.pdf (136K) otherwise known as the H143.pdf (136K)
    Replacements, if required, should have Qts around 0.7 and sensitivity of 89-90dB. Using a higher sensitivity will require padding-down with a low-value series resistor owing to high sensitivity contributed by the Tractrix horn loading. Using a driver with significantly lower sensitivity will lead to a recessed midrange - there is no scope for raising the output of the midrange crossover (i.e. no existing series resistor in the crossover to remove)
    .
    .
    .Tweeter: H1, H2, Ta'us, H5
    Focal TC90K: 1.35T magnet, kevlar inverted dome. TC90K.pdf (116K)
    Well, not quite: The kevlar dome the Impulses used was a custom build using the kevlar/glassfibre dome in a 120-sized magnet and faceplate... which is 120 x 120mm, rather than the 90 x90mm of a TC90.
    So - there is an easy replacement & upgrade for owners of speakers using this tweeter - substitute the Focal TC120TD5.pdf (136K) - if you can find them now that Focal has stopped supplying the aftermarket! This may require adjusting/adding an L-pad to reduce the treble level - the '120 is 2dB more sensitive than the '90K - try 1ohm resistor in series, with 22-ohm R across the 120s terminals, to begin with.
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

    Also a pishanto specialist confirmed by Head Daftee

    Real name " Allen " or "Zoomer Nut”, “Numpty Napper”.

    ±± KEEP IT REEL

  5. #25
    Join Date: Mar 2008

    Location: Dunfermline, Scotland, UK

    Posts: 12,742
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    Check out that crossover mod Al, well worth doing imo.
    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

    Hunter S Thompson

  6. #26
    Join Date: May 2012

    Location: Dagenham Essex

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    Quote Originally Posted by Ali Tait View Post
    Al, check out the H2 pages on the Acoustica website, there is a minor mod to do on the crossover that is well worth doing.
    OK will do at a later date
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

    Also a pishanto specialist confirmed by Head Daftee

    Real name " Allen " or "Zoomer Nut”, “Numpty Napper”.

    ±± KEEP IT REEL

  7. #27
    Join Date: Jun 2014

    Location: Chorley Lancs

    Posts: 4,446
    I'm Steve.

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    Quote Originally Posted by Audio Al View Post
    Impulse H2: Arguably the best of the lot. A derivative of the H1 which appears to have superceded it. Mostly handmade cabinet, same driver complement as H1, but a simplified bass horn folding leads to reduced cabinet volume with negligible loss of sensitivity and extension. Capable of stupendous bass quality and extension - although specified for cutoff at 40Hz, in-room measurements at home show extension flat down to 30Hz, -6dB at c.27Hz. Positioning close to the rear wall is recommended, but this speaker is remarkably unfussy about siting. Tractrix midhorn with driver open to rear and top, inverted-dome tweeter Sensitivity 95dB/W, 8ohm
    Drivers: 8.5" Seas bass; 4.5" Seas mid; Focal tweeter.
    Crossover ponts: 800Hz; 4Khz; 2nd order summed response.
    Size: 1160mm H x 270mm W x 480mm D
    Finishes: Rosewood or Oak with cloth inserts
    Weight: approx 65KG / 140lb each.
    Available: 1991-1996(?); list price c.£2,300
    Reviews: 3 raves to pick from! (note these are all large images - 1024 pixels wide, GIF format, c. 250Kb)

    Jimmy Hughes in the Audiophile, June 1991:Page 1 Page 2 (B&W photo)
    What Hifi?, April 1992: Page 1 Page 2
    What Hifi?, Summary: May 1992: May 92
    65kg EACH? if you take these to Kegworth next year (hopefully), don't forget your "special" underpants They must be about the same size as your Ushers - just how big IS your house?
    Excuse me, are you the Judean People's Front?

    T/T: Inspire Monarch, X200 tonearm, Ortofon 2M Black. Phono: Yaqin MS-22B CD: Densen Beat B400 Plus; Headphone/pre: Myryad Z40; Amp: Audion Silver Night 300b stereo
    Speakers: Zu Omen Def. Atlas Equator interconnects, Atlas Hyper 3.0 speaker cables

    T'other system:
    Echo Dot, Amptastic Mini-1, Celestion 5's, BK XLS-200 DF

    A/V:
    Panasonic 42" plasma, Panasonic Blu Ray, Sony a/v amp, MA Radius speakers, REL Storm sub

  8. #28
    Join Date: Mar 2008

    Location: Dunfermline, Scotland, UK

    Posts: 12,742
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    That’s a typo, they’re not that heavy lol.
    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

    Hunter S Thompson

  9. #29
    Join Date: Jan 2009

    Location: Essex

    Posts: 20,882
    I'm openingabottleofwine.

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    Quote Originally Posted by Ali Tait View Post
    That’s a typo, they’re not that heavy lol.
    They bloody well are!
    Barry

  10. #30
    Join Date: Aug 2012

    Location: Sunny Portsmouth

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    Gosh the H2's are so heavy...
    Bev


    Mark Levinson N°.390s CD Through: MG HDX1 To: Mark Levinson N°.383 To: Magneplanar .7's

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