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Thread: What are you using with your JBL 4345?

  1. #31
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    Quote Originally Posted by pos View Post
    I knew I should have saved this post before 4313B delete it ...
    It was irrelevant to this thread.

  2. #32
    Moderator hjames's Avatar
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    Quote Originally Posted by pos View Post
    I knew I should have saved this post before 4313B delete it ...


    Why?
    What did he say now?
    C'mon, share with us,
    we are all fans ...
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
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  3. #33
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    Quote Originally Posted by hjames View Post


    Why?
    What did he say now?
    C'mon, share with us,
    we are all fans ...
    It was Greg's active solution suggestion for the 4344/4345.

    Basically any decent 12 dB/octave or 24 dB/octave LR filter wherein the voltage drive is 6 dB down at the target crossover frequency of 200 Hz to 400 Hz. I believe his specific combination of capacitor/resistor values resulted in a crossover frequency of 310 Hz. Or maybe that was Rod's. Whatever works in a specific room in the 200 Hz to 400 Hz range.

    I didn't want to get into another argument about specific brands. And if some folks want to trick out older electronics it could be fun.

  4. #34
    Moderator hjames's Avatar
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    Quote Originally Posted by 4313B View Post
    It was Greg's active solution suggestion for the 4344/4345.

    Basically any decent 12 dB/octave or 24 dB/octave LR filter wherein the voltage drive is 6 dB down at the target crossover frequency of 200 Hz to 400 Hz. I believe his specific combination of capacitor/resistor values resulted in a crossover frequency of 310 Hz. Or maybe that was Rod's. Whatever works in a specific room in the 200 Hz to 400 Hz range.

    I didn't want to get into another argument about specific brands. And if some folks want to trick out older electronics it could be fun.
    Okay, but - maybe you could post it in the 4345 Tech ref thread instead?
    worst case just say that its a potential solution as of Oct 2009 -
    Some of us can't move on new ideas quite as quickly as we'd like, but we still appreciate knowing about the ideas!
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

  5. #35
    joelcwu
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    Just found this thread, I've been owner of 4345 for 2 yrs, bought from another forum member from a S.Carolina recording studio. The experience with the 4345 are both rewarding and hard on the money, you need a deep pocket to bring out the best of these sensitive studio monitors. Here is a list of what I use:

    Pre: ARC SP11 MKII
    Crossover: Bryston 10B Standard, RCA, set at 300HZ
    for high,140 HZ for low, both on 12db slope.
    Power: Top: Canary 303 (18W, 300B PP)
    Bottom: Bryston 4B ST
    Source: Digital: Pioneer universal DVD player DV989
    Analogue : Micro Seiki BL91/ FR64FX/ EMT JSD5G
    Accessory: PS Audio PS1000 power conditioner

    The 4345 is quiet sensitive to what you use in the system, every cable change, component swap,would bring a profound effect to the sound, not to mention playing with crossover frenquency or slopes.
    If there's complain about 4345 will be the 2405, mine unit barely wispers, but set it at plus 2, it brings correct sound image. For the moment I am keeping it stock, modification to the crossover is tempting. On the Bryston 10B, since it doesn't have a 290 HZ setting, I don't know how it has impact the sound by setting the highs on 300HZ. If it's somthing I can live with, it will be a project for the future.

  6. #36
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    Quote Originally Posted by joelcwu View Post
    On the Bryston 10B, since it doesn't have a 290 HZ setting, I don't know how it has impact the sound by setting the highs on 300HZ. If it's somthing I can live with, it will be a project for the future.
    Whatever works in your room between 200 Hz and 400 Hz...

  7. #37
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    Still working on the 4345

    All,

    I am still in the process of finishing my JBL4345 clones. Just wanting for network/crossovers to be finalized.

    Once the speakers are done, I was planning on bi-amping them. I have been given the opportunity to purchase a McIntosh MC7270 for a very fair price. It is 270wpc. I wanted to know whether you guys think it would work well for my intended purpose (i.e. simply running the 2245Hs in my JBL 4345s).

    Thanks,
    D

  8. #38
    Senior Member BMWCCA's Avatar
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    Quote Originally Posted by dkalsi View Post
    Once the speakers are done, I was planning on bi-amping them. I have been given the opportunity to purchase a McIntosh MC7270 for a very fair price. It is 270wpc. I wanted to know whether you guys think it would work well for my intended purpose (i.e. simply running the 2245Hs in my JBL 4345s).
    Not that I have anything to compare them to, but my 4345s continue to impress and I use either a Crown DC300A-II or PS-400 on the 2245s. They're just under 200-watts-per-channel at 8-ohms. :dont-know
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

  9. #39
    Super Moderator yggdrasil's Avatar
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    I have a Nelson Pass'ish DIY amp driving mye 2245's. It is ~160W/8Ohm.

    I find it sufficient when I want to crank up the volume, and simply wonderful at any volume.
    Johnny Haugen Sørgård

  10. #40
    Senior Señor boputnam's Avatar
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    Quote Originally Posted by dkalsi View Post
    Still working on the 4345
    Me too. It never stops...

    Current config has:
    • Bryston 10B, Linkwitz-Riley -24dB slope
    • 2245's are being driven by a QSC CX502 (300 w/ch 8 Ω)
    • Upper band passes are driven passive by a Lab Gruppen fP3400 (1000 w/ch 8 Ω). I know, it's about 5x what I need, but is the only spare LG I had sitting around, I love the way they sound and I set the MLS switch to -5dB = 300 w/ch 8 Ω).
    The Widget stopped by the other day, and we both (re)marvelled at how good this simple 2.0 system sounds. The tonality thru the 2245's is a real marvel; the highs through the TAD TD-2002's is matchless; transients real.

    I probably should go Class A on the upper band passes. Maybe some day...

  11. #41
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    Quote Originally Posted by boputnam View Post
    The Widget stopped by the other day, and we both (re)marvelled at how good this simple 2.0 system sounds. The tonality thru the 2245's is a real marvel; the highs through the TAD TD-2002's is matchless; transients real.


    I probably should go Class A on the upper band passes. Maybe some day...
    I agree with you and Widget, the TAD's transformed mine too. Hey Bo, before you jump to class A, about a year or so ago, I put a Bryston 2BSST(squared) on the top of mine and had very positive results. So much so, I decommissioned my DIY fully balanced high end tube stuff, pronto. I use a 4B SST2 on the bottom.

    To add icing on the cake, I recently added a second 2B and now run them as balanced monoblocks for even better performance. No need for the extra power, of course, but the advantages of running fully balanced differential config. works very nicely.

  12. #42
    Senior Señor boputnam's Avatar
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    Quote Originally Posted by Chas View Post
    ...I put a Bryston 2BSST(squared) on the top of mine and had very positive results.
    Yeah, the Widget was suggesting the same. I'm keen on that idea - everything Bryston sounds excellent, and they are not priced like their stratospheric peers...

  13. #43
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    Quote Originally Posted by dkalsi View Post
    All,


    Once the speakers are done, I was planning on bi-amping them. I have been given the opportunity to purchase a McIntosh MC7270 for a very fair price. It is 270wpc. I wanted to know whether you guys think it would work well for my intended purpose (i.e. simply running the 2245Hs in my JBL 4345s).

    Thanks,
    D
    Well vintage amps don't look much better than a 7270. BMW guy loves his 160ish WPC Crown, I have a 350WPC Crown, someone said their 60 watt tuber sounded best. Then again my best bud in Texas runs a 7270 through his 45's by itself and loves it [has had a sheltered life]. Personally, I would love to have the 7270 to match my 2125 [top] and Mc preamp just for the looks. Rumor has it that there are more modern reliable amps that would work better, at a lesser cost. Yes it will work. Buying public is nuts over old McIntosh, so if it doesn't work for you, sell it and move up!

  14. #44
    Senior Member BMWCCA's Avatar
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    Quote Originally Posted by Triumph Don View Post
    Well vintage amps don't look much better than a 7270. BMW guy loves his 160ish WPC Crown, I have a 350WPC Crown, someone said their 60 watt tuber sounded best. Then again my best bud in Texas runs a 7270 through his 45's by itself and loves it [has had a sheltered life]. Personally, I would love to have the 7270 to match my 2125 [top] and Mc preamp just for the looks. Rumor has it that there are more modern reliable amps that would work better, at a lesser cost. Yes it will work. Buying public is nuts over old McIntosh, so if it doesn't work for you, sell it and move up!
    I'm certainly not suggesting the Crowns as the ultimate here. There are several other amps I'd love to try. I suggest the Crown PS and D-series amps as low-budget alternatives. (I'm paying for private college educations for three daughters, and non-renewal of my employment contract last year put a crimp in that, keeping me a "bottom-feeder" for some time yet.)

    The latest PS-400 cost me $100 in perfect condition from a studio in a Maryland suburb of DC off Ebay. The PS-200 was only a bit more but came in Crown packaging direct from a recent factory performance check and service with all the receipts from Crown showing twice what I paid for it as the invoice cost of the check-up and service.

    Good advice above, though. Macs are always easily re-sold if bought in a reasonable range. Certainly easy enough to try it and decide. I still keep my C20 around for fun since we've been together for over forty-years now.
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

  15. #45
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    Quote Originally Posted by boputnam View Post
    The Widget stopped by the other day, and we both (re)marvelled at how good this simple 2.0 system sounds. The tonality thru the 2245's is a real marvel; the highs through the TAD TD-2002's is matchless; transients real.
    Yeah, too bad JBL couldn't make a nice 1" exit compression driver. Oh well.
    Quote Originally Posted by boputnam View Post
    I probably should go Class A on the upper band passes. Maybe some day...
    I'm using grungy old Citation 22's on the top and bottom and they sound just fine (And I've heard some seriously expensive gear over the years.) My next choice would be the Brystons mentioned above.

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