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Thread: 4628B curve for Zilch

  1. #76
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by cosmos View Post
    Rob,

    Yeah, they can be a little overwhelming if you let them...

    It's amazing how effortlessly they can produce deep bass. If you watch them work, you can barely see them working. You hear the boom, but just barely see them move. Amazing I tell ya!!!

    Further, they are just about a perfect bottom for 4628B. I think in a pair they're about the same efficiency.. and they integrate with the E145 so well.. It is a much better sounding system than many, many knowledgeable people would think. No, it's not leading edge.. but damn it makes nice music and it sounds live and dynamic!

    Before I found these, I had a pair of SR4718 that sounded great, but was looking for a pair of 4518. These came along and I am really pleased with their performance. The funny thing is, with them on casters and stacked up that way, it really doesn't take that much floorspace and they're easy to move around. I have Metal and fabric grills for the front to protect the drivers from accidentally putting a board through a cone.
    You're right, I'll say,you can call 4628B PA box,but it is more than a PA box!it sounds more near live than most monitor playback systems. damn so good out of your imagination!unbelieveable!
    Yesterday,i went to local hifi store,they are showing Wilson audio speakers, a small Wilson speaker(sophia?not sure) is powered by Gryphon,it sounds great indeed:nature\ balance\mild,but the price is ridiculous,220KRMB! comparing with JBL,they are just toys and luxury.
    46 lover

  2. #77
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by pos View Post
    1.5khz or so would be much better. You also need to match the horizontal directivity at the crossover point. The 2344 is 100° from 1khz up. The 2118 shall be 100° maybe around 1.8khz, so that would be the maximum crossover point. It would be the ideal crossover point with steep slopes. Anywhere between 1.2khz and 1.6khz should be good with shallow crossover slopes.
    But keep in mind that the 2344 needs specific compensation, because it is a pure constant directivity design in the frequency range you are considering.
    How do you think about 2206\2226\E140?Which one go deeper?
    Thank you
    46 lover

  3. #78
    Senior Member pos's Avatar
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    You have E145, you don't need any of these.
    If you want to start a new system from scratch I suggest you look at this:
    http://www.audioheritage.org/html/pe...ues/system.htm

  4. #79
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by pos View Post
    You have E145, you don't need any of these.
    If you want to start a new system from scratch I suggest you look at this:
    http://www.audioheritage.org/html/pe...ues/system.htm
    That's a big project!
    I mean that i just have intent to build two 15' system,you know in China, space is more expensive than gears.
    Maybe only adding a 2245 on each chanel is a best way for my 4628B.
    Have you ever listened to 4628B?how do you think of it?Attachment 48571
    46 lover

  5. #80
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by pos View Post
    You have E145, you don't need any of these.
    If you want to start a new system from scratch I suggest you look at this:
    http://www.audioheritage.org/html/pe...ues/system.htm
    One more question,pos
    4628B's boxes is just the same,that is not mirror imaged
    I noticed that 4315 is not mirror imaged as well,but most studio monitors are mirror imaged.
    How this affect the sound image?why?
    Thank you
    46 lover

  6. #81
    Senior Member pos's Avatar
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    Not that much . The geometry of your room has much more impact on stereo imaging when sited 2 or 3 meters from the speakers.

  7. #82
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by pos View Post
    If I were you, I would only keep the 4628B and sell the 4699 and 4691 and other cabaret speakers you might have.
    The 4628B Is the only one that really has good component and can be converted to hifi use. I would use subwoofer(s) to assist under 80Hz (real subwoofers, not PA speakers from the cabaret serie)
    I would discard the current passive filter and go fully active. The M533 is a good unit but a digital crossover like a DCX2496, together with some measurement gears, would give you more possibilities.

    Then, you have to change something with the drivers if you want a really good sound, because neither the 2118H nor the 2404H-1 are really good at 3khz.

    You have 3 choices:

    1- remove the 2118H, close its opening, and put a big horn and compression driver on top of the cabinet. Crossovers could be something like 800Hz and 8khz. The horn could be something like a 2397 if you find one. You will need a big horn to reach 800Hz (the E145 is not that great higher than that)

    2- keep the 2118H, and put a small horn on top of the cabinet, with a higher crossover, like 1200Hz and 8khz. A 2307/2308 could do the job. But then you will have a 4 way (plus subwoofers!) and the crossover will be difficult to deal with

    3- remove the 2404H-1 (this is the -1 variant anyway: it does not go that high) and replace it by a small horn and compression driver that is able to go to 20khz. That would be the best option in my opinion. A JBL 2407 (or BMS 4540nd) and a the small PT waveguide from the JBL AC16 speaker (PT-B99HF-1). This is going to be a really inexpensive combo (the 2407 can be found on ebay US, and the horn can be had from JBL Pro and is something like 10$ each), and can sound very good. The crossover point with the 2118H would be around 2.5khz, and you would have to use the CD compensation function of the M553 (horn preemphasis)
    So in the end that would be: E145 up to around 400Hz, 2118H from 400Hz to 2.5khz, 2407 from 2.5khz up to 20khz with CD compensation. That can be done with the M553, fully active.

    Then you just have to add some subwoofers, preferably spread accross the room, and you will have a killer system.
    Hi,pos,i'v just bought a Behringer DCX2496,now i can do something for my 4628B
    It cost me 960RMB.
    46 lover

  8. #83
    Senior Member martin_wu99's Avatar
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    I have intent to buy a pair of LSR12,12''active subwooofer ,could it work with E145?that match 4628B?
    46 lover

  9. #84
    Senior Member pos's Avatar
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    yes, these are very good subs!

  10. #85
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by pos View Post
    yes, these are very good subs!
    Then comparing with 2235,which one is bettter?or more suitable for 4628B?
    46 lover

  11. #86
    Senior Member pos's Avatar
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    With the LSR12 you get a complete subwoofer with amp, protection, and crossover.
    The 2235H is a great driver, better than the 252F in the LSR12, but you needs bigs cabs and a capable plate amp. Two LSR12 should be more than adequate for home use

  12. #87
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by pos View Post
    With the LSR12 you get a complete subwoofer with amp, protection, and crossover.
    The 2235H is a great driver, better than the 252F in the LSR12, but you needs bigs cabs and a capable plate amp. Two LSR12 should be more than adequate for home use
    How about 2245 cabs?
    Someone on this forum think they are more suitable for home hifi usage.
    http://www.audioheritage.org/vbullet...air-of-Sub1500
    46 lover

  13. #88
    Senior Member pos's Avatar
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    These are even better, but you will need to build even bigger (and better) boxes for them.
    LSR12 : 50L
    2235H : 150L
    2245H : 300L ...

  14. #89
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by pos View Post
    These are even better, but you will need to build even bigger (and better) boxes for them.
    LSR12 : 50L
    2235H : 150L
    2245H : 300L ...
    That's space vs.demand indeed.
    Which one corresponds to E145?
    46 lover

  15. #90
    Administrator Robh3606's Avatar
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    Hello martin

    The biggest question you need to answer to figure out what sub to use is what are the peak SPL requirements for them?? Also music will be much less demanding than HT from 40Hz and down so how will you be using them??

    I use a 2235 as my LFE sub in a B380 box and it works fine however it is peak SPL limited on demanding material. I can hit the THX 105db reference level just fine but I am running close to the edge in LFE channel doing it in my room. I am building a second B380 to have a pair for LFE to give me another 6db of headroom.

    If you have a large room or like to listen loud make sure the subs can keep up. You can always add another sub down the line if you need too.

    Rob
    "I could be arguing in my spare time"

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