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Thread: Northwest Horns w/ slanted cabinets

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  1. #1
    Senior Member louped garouv's Avatar
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    Northwest Horns w/ slanted cabinets

    Anyone familiar with these? Seems like there may have been a few variants on the theme produced.
    these have the 3 vane horns - possibly Northwest model 340 from what I have gleaned....

    thanks in advance for any insight.
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    Yep, I'm quite familiar with those NorthWest Horns ( owning more than 2 dozen of them ).

    If they are @ 24" across then they are the Model 340 ( meant for drivers with a 2" exit ) . There was also a larger model / the 350.

    They are ( as is the case with virtually all conical/planar horns ) very "open" sounding. That's the good news.

    The bad news is ( & also a result of the mostly planar profiles contained within the horn bell ) the horn barely loads the intended large 4" diaphragm drivers down to 800hz.
    - We now know ( I suppose ? ) through the emergence of the M2 horn ( waveguide ) that horn loading isn't always the bug-a-boo previously trotted out as finger-waggling piece of dogma ( ie;" thow, shalt not break this rule /upon fear of audio death " ).

    Anyways, with a bit too much drive ( and perhaps a sketchy crossover point ) the expensive destruction of one's 4001 diaphragms is a simple bump of the fader away ( just ask Maryland Sound ).

    These horns found a happier niche within the recording studio market ( back in the 80's ) .

    Their most significant design heritage looks obvious ( to these eyes ) as being inspired by the W.E./Altec 32a/32b ( redesigned for a bigger entrance with most of the throat removed ).

    FYI, there's a ( necessary ) metal adapter plate that goes between the horn & the driver ( since all the versions that I've seen ) didn't have a flange to mount the driver onto.




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    Senior Member louped garouv's Avatar
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    'Tis very much appreciated Earl --

    I'm guessing that you might have posted a pic of the mounting plate --
    but all I see is a small "X" box/icon -- I'll pull this up with another browser tonight...

    I'll have to fabricate this I think, as they are not present in the pair I have --
    I'm thinking an appropriate sized hole for the driver throat - in some thick sheet metal stock, w
    ith properly places holes for driver mounting to the plate and then to the flare - would basically do the trick?


    (neither are the ring radiator driver mounting holes - but easily remedied)

    I'm planning on using some 2440 motors with the Truextent diaphragms with the cabinets -
    so I will certainly take your warning about a proper crossover point very seriously....

    Best regards,
    David

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    You're Welcome Louped !

    I'll take another picture of the stock plate and post it here.

    I had received a stock adapter ( way back when in 86 ).

    I simply made the rest out of 1/8" hardened aluminum alloy ( I'll remeasure & get an accurate thickness ) .

    I purchased mine as cut stock from a local metal fabricating company .

    The most difficult aspect of making your own adapter is producing a nice clean 2" wide hole.

    I punched mine out using a ( fairly pricey ) GreenLee hole punch.

    As seen in the following picture ( click it, to go see it sold via Amazon.com );



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    Senior Member louped garouv's Avatar
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    that advice also helps much.
    I'll have to reach out to some electricians I know,
    that seems like something a commercial sparky might have around, maybe...
    (I can hope at least.... )

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    A drill press and a 2" hole saw is just as nice,and a lot cheaper...

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    Northwest Horns 250 Model

    I'm looking for some northwest horns model 250 24" wide. Anyone have them for sale.

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    Northwest Horns 340 Model

    I'm looking for some northwest horns model 340 24" wide. Anyone have them for sale.

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    Quote Originally Posted by Danny B View Post
    I'm looking for some northwest horns model 340 24" wide. Anyone have them for sale.
    Hi Danny, I got few pairs of Northwest 340 horns for sale, I'm few miles from Downtown LA.
    Name:  Northwest Horn.jpg
Views: 616
Size:  56.7 KB

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    Here's a pic showing these horn in action ( within an un-named studio ).





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    I notice on most of the 340 horn setup that I saw from the picture the horn opening is in front of woofers by few inches.
    Is it for time alignment?
    Anyone know if there's exact measurement for this distance?

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    Quote Originally Posted by rl5555 View Post
    I notice on most of the 340 horn setup that I saw from the picture the horn opening is in front of woofers by few inches.
    Is it for time alignment?
    Anyone know if there's exact measurement for this distance?

    Only Acoustic Measurements of the pictured setup ( that capture the offsets ) would be able to answer your question ( so that leaves me unable to help ).

    Sorry

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    I'm interested in your model 340 northwest horns

    Quote Originally Posted by rl5555 View Post
    Hi Danny, I got few pairs of Northwest 340 horns for sale, I'm few miles from Downtown LA.
    Name:  Northwest Horn.jpg
Views: 616
Size:  56.7 KB
    I'm interested in your model 340 Northwest Horns Danny 310-528-8888

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