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Thread: 2 way with 2245h?

  1. #1
    Senior Member baldrick's Avatar
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    2 way with 2245h?

    I have a few extra 2245h in 4645 cabinets and wandering what to do with them since I don't need them as subwoofers.

    Have anyone used 2245h in a 2-way setup with i.e. 2450? What is highest usable freq/XO for 2245h?

  2. #2
    Senior Member 4345's Avatar
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    2245 two way

    I tried it with a 2242. I did not like it so much. However, I think I did not put enough time into the project. I think Bi-Amping would be good. I think the K2 amp on the lows might help. I have a k2 now also, but never tried it on the 2242. Maybe you can try it and see how it sounds. I think a 500hz x-over might be the highest you can use a 2245 and many would probably say that is nuts.

    Good Luck.

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    Senior Member Lee in Montreal's Avatar
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    Hi Baldrick

    The idea is interesting, and as you already pointed out, the key is in the crossover frequency. I don't think you'll get much above 300Hz from a 2245. Making a box and measuring would be the way to see if the sound is still nice in that region. So, if it works up to 300/350Hz, then you'll have ato find a horn that goes very low.

    The Iwata 300 is crossed at 450Hz. Depeding on the slope, you may have enough meat below to fill the dip. The same can be said from JBL's 2360/65. Crossed at 500Hz with useable range down to 300Hz.

    What about a 170Hz Tracctrix horn?
    http://counseling-software.com/tractrix.html

    Can your 2" diaphragm widthstand working at 250-300Hz, even at low power? How does the horn/driver behave above 10Khz? Basically, what you gain down there, is lost up there. I think that the jey is to find how high the 2245 woofer will work, then decide for the top section.

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    Administrator Mr. Widget's Avatar
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    A 2-way with a 2245H?

    I think it can be done, and I think a 200-300Hz crossover is where you should limit the 2245... the key is the top part of the spectrum. I think you'd be best served by going with a large "full range" ribbon or electrostat panel above. I know there are single driver "full range" speaker fans that would have their recommendations, but to my ear, I've never heard one that didn't overly color the sound. As for going with a compression driver? I don't think you can get from 150Hz to 15KHz-20KHz with a single driver.

    Widget

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    Senior Member baldrick's Avatar
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    Quote Originally Posted by 4345 View Post
    I tried it with a 2242. I did not like it so much. However, I think I did not put enough time into the project. I think Bi-Amping would be good. I think the K2 amp on the lows might help. I have a k2 now also, but never tried it on the 2242. Maybe you can try it and see how it sounds. I think a 500hz x-over might be the highest you can use a 2245 and many would probably say that is nuts.
    I am useing 2242 for subwoofers and I think they are great for that but I think 2245h is a better choice if considering used in a 2 way setup like this.

    Quote Originally Posted by Lee in Montreal View Post
    The Iwata 300 is crossed at 450Hz. Depeding on the slope, you may have enough meat below to fill the dip. The same can be said from JBL's 2360/65. Crossed at 500Hz with useable range down to 300Hz.

    What about a 170Hz Tracctrix horn?
    http://counseling-software.com/tractrix.html
    I was thinking of 2360 some time ago but after I read about several people trying them and didn't like them too much, the will also need a supertweeter so I don't think they are the answer for me..

    Quote Originally Posted by Mr. Widget View Post
    I think it can be done, and I think a 200-300Hz crossover is where you should limit the 2245... the key is the top part of the spectrum. I think you'd be best served by going with a large "full range" ribbon or electrostat panel above. I know there are single driver "full range" speaker fans that would have their recommendations, but to my ear, I've never heard one that didn't overly color the sound. As for going with a compression driver? I don't think you can get from 150Hz to 15KHz-20KHz with a single driver.
    I was hopeing 2245h was usable a bit higher than 300 hz (x-over in 4345 is 320hz), but if 300 is aprox the limit I agree with Widget that compression driver might not be a good solution.

    I know a guy useing his huge bassystem (dipol system with 16x21" Beyma) with Bohlender Graebener RD75 ribbon driver, I think he's useing them from 150hz, that might be an alternative.

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    Senior Member ivica's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    I think it can be done, and I think a 200-300Hz crossover is where you should limit the 2245... the key is the top part of the spectrum. I think you'd be best served by going with a large "full range" ribbon or electrostat panel above. I know there are single driver "full range" speaker fans that would have their recommendations, but to my ear, I've never heard one that didn't overly color the sound. As for going with a compression driver? I don't think you can get from 150Hz to 15KHz-20KHz with a single driver.

    Widget
    What would be a problem driving 2245 up to say about 500~600 Hz ?

    In 4333 driver 2231A was driven up to about 800Hz

    reg.
    ivica

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by ivica View Post
    What would be a problem driving 2245 up to say about 500~600 Hz ?

    In 4333 driver 2231A was driven up to about 800Hz

    reg.
    ivica
    In the 4333 taking the 2231 up to 800Hz is one of it's weakest links... using a much larger 18" driver up to 500-600Hz would be much worse.

    The issues: the beaming issues due to cone diameter, the mass of the large heavy cone, and the break up of that large cone.


    Widget

  8. #8
    Senior Member ivica's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    In the 4333 taking the 2231 up to 800Hz is one of it's weakest links... using a much larger 18" driver up to 500-600Hz would be much worse.

    The issues: the beaming issues due to cone diameter, the mass of the large heavy cone, and the break up of that large cone.


    Widget
    I could agree with You, but interestingly, about 2245 here on forum there are lot of 'stories" but I have not seen distortion measurements (SHD, THD, IM...) of mentioned driver in the whole range, say up to 2000Hz .....

    Only i know is from JBL documentation:
    "..Usable frequency response shall extend from 20 Hz to 2 kHz. On-axis response, measured at a distance of 2 m (6.6 ft) or more under free field conditions, shall be ± 3 dB from 40 Hz to 800 Hz. Acoustic loading shall further extend the low frequency response. .."

    and from the graph is visible that 45 deg off-axis "role off" starts from about 600Hz ( http://www.jblpro.com/pages/components/2245H.pdf )

    Only some experience about 2245 distortion I have found in:
    http://www.lansingheritage.org/image...subs/page4.jpg
    but up to 100Hz ONLY
    Attached Images Attached Images   

  9. #9
    Senior Member edgewound's Avatar
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    You could conceivably get there by designing a prodigious line-array of series parallel, small full-range drivers and use the 2245H below 300hz.

    Might need a bit of EQ though.
    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

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