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Thread: Small but perfectly formed JBL home cinema

  1. #151
    JBL 4645
    Chapter 12 Apollo 13 region 2 DVD at (32 minutes 35 seconds) as the fuel is bumped though the large manifolds up though the centre channel exterior then interior as it moves around the command module on the surrounds at (32 minutes 36 seconds) as Fred Haise (Bill Paxton) turns his head and eyes into the direction as it sweeps around the surrounds then a breathing like sound on the left side is heard. The Saturn V is now ready to go.

    I’d hath to run further tests to check the internal frequency ether with frequency sweep and plug the LCRS into one of the few tools REW or spectrumlab to see what is happening in terms of frequency.

    Checked the LCR and there have been some changes to frequency at 100Hz on left and right as they have been reduced recently and now increased on the parametric EQ. Centre needed to be reduced at 100Hz as it was now too strong, so a little reduction and checking with all-channels added together with a few minor distance level settings altered over LCR.

  2. #152
    JBL 4645
    My other active crossover 2WEX (2-way crossover) think its crossover is set at 500Hz not sure which type of crossover network system? It does its job but there is no way I can use this for tweeter control as it would be too strong!

    I can use it like this!

    Set the inputs as normal and then pass the outputs though a mixers line inputs 1 LF left 2 HF left 3 LF right and 4 HF right and then use the outputs from the mixer left and right to pass into the surrounds processor Pioneer VPS-200 which is what I’m thinking about doing.

    This will provided a simple treble boost and cut control seems complicated no its basic and straight forward, thou I would prefer another DCX2496 for the surrounds and sub bass.

    The picture of the inside is bit overexposed the flash as defused the PCB and that’s the fault of the camera.
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  3. #153
    JBL 4645
    I’ve been doing some thinking while looking over a JBL 2235 looks a bit dodgy if you ask me.

    Precipitation of the low end!

    How it arrives at the listening position at different intervals due to differences in frequency response and range over the seating area that should be uniform.

    I tend to get spots where the tone is around the left side of my head and somewhat less on the right side. Now if I turn slightly the tone appears or seems to be equal but there are slight minor gaps between the two-seated-sofa.

    Nothing to difficult to try and understand, but with one sub it does seem almost impossible to get all tones to radiate uniformly. I can get some tones to do this but not all.

    I was thinking maybe multiplexing microphones because I can tackle everything more or less at the same time without having to keep repositioning a single microphone every 5 minutes!

    A simple patch bay or microphone multi-mixer with inputs and outputs that can be patched into the computers RTA and simple switch or muting of each microphone to determine which parts need addressing over the seating area.

    Now I can’t very well place the SONY CRT onto the JBL 4645 just not possible without the colour getting cowed-up or discoloured with magnetic damage to the CRT colour guns.

    I can’t even flip the sub over to put the 18” nearer to the centre as it would be too near to the SONY CRT. Also placing it up higher will present issues with line-sight its will suited where it is. Also getting the height of the LCR lined up again and the tone of the frequency range will also change. Isn’t it a bitch?

    I’m guessing six Behringer ECM8000 of the same microphone placed over the seating area two for each seat one forward and one placed back a bit as well as placing some in the middle so that all areas would be covered for analysis on an RTA.

  4. #154
    JBL 4645
    My dad dropped around a few items this morning one such item may reduce some of the clutter in the living room with this wooden frame table thingy.

    I sized up one side of it that might be suitable for the Alesis RA300 amplifiers and more.

    I’ll size up an RA300 and if it fits in on one side I’ll start disconnecting the whole system and drilling the holes for the amps rake slot holes, hope they fit?

    This is going to take the best part of the day and its pancake day as well, bugger I like pancakes.

    I’ll let the CD finish then start disassembling.

    “Disassemble! No not disassemble”!

    I tried one Alesis RA300 and the screws is no go, so I’ll work a way around that and lay them on top of each other and there is mild heat issues at risk, I’ll keep them well vented to allow airflow around them.

    Well that’s it CD as now finished and time to get cracking.
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  5. #155
    JBL 4645
    Time from disassemble to reassemble slightly over 4 hours.
    Pink noise has been tested over LF/HF LCR and is in correct order.
    Surrounds have been tested and are also in correct order.
    Sub bass LFE.1 tested and in correct order.

    Now this has made only slight difference in the stacking height is less depth less width just a tiny bit.

    It’s just a little bit neater than before. It will have to do for now, until I can afford some racks which are long overdue and get all this in the bedroom out of the way.
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  6. #156
    JBL 4645

    Talking Reservoir JBL’s full range “Lets go to work”.

    At the present time, with more time, on my hands I’m dealing with the matching LCR yet again with the two subs playing the same range in the low end department 15Hz while the remain frequency response sweeps though up to 16,000kHz.

    So far applied a frequency cut on the left channel as it was a bit high between 15Hz and 47Hz a little Q not going to talk about the rest of the sound politics too much until its finalized.

    Now I have a few more things to address and attend too. Same technique of “In & Out” I get out of the room while it does the full range sweep, as to not disturb the sound waves.

    Also I decided too have a little fun, but being serious at the same time.

    Now you channels’ will all be using allies on this EQ. Here are your names.

    Left channel you’re Mr Red
    Centre channel you’re Mr.
    Right channel you’re Mr.

    Why am I Mr. Purple?

    Because you’re a poof, okay.

    Why can’t I be Mr. Red?

    You’re Mr. Purple!

  7. #157
    JBL 4645

    Something even bigger coming…!

    A close friend called yesterday and asked if I would like a 32” Panasonic CRT FST. I asked how much? £50.00 pounds I asked why and that I’d be surrounded with CRT he laughed and I asked isn’t that your old CRT that evidently he gave to his girlfriend and that she’s got a flat screen now.

    So I said done, deal.

    Only problem now is? What do I do with the SONY 27” CRT and to think I was just getting used to it.

    I have the Toshiba 20” in the bedroom for myself and Sooty my cat. The kitchen is no good as I’m only meters away from each room. I measured/sized it up no way impossible to fit in the kitchen and besides its waste of electricity. I might put it aside on the floor in the bedroom and place the SONY in the bedroom.

    Now the other issue is colour strain due to the subs on each side of the front, that’s right there placed back up front again. I’d soon find out if there’s a colour strain issue and I need my friend to stay around for while, while I try out different positions as its rather heavy to lift on your own.

    Also this would change the front JBL control 5, height placement. There positioning at present is spot-on for directional hard and half dialogue panning and I’m not about to screw that up because it takes hours to get done right.

    The width of the Panasonic will push the JBL 4645 over slightly to the right more, sigh. If I can get the platform built it would help with the LCR placement where I wouldn’t have to stack the JBL control 5 onto tower speakers and empty boxes just so that the height is correct.

    Anyway not sure what day he’s bring it over and I’d pay him half now and another half in few weeks and he’s cool about that.

  8. #158
    JBL 4645

    Just had a rather inspiring bright light idea for JBL control 1 LED project!

    While looking at the new JBL LSR 2300 series which as blue LED placed in the middle of the baffle and while watching one of my favourite Star Trek original laserdisc to DVD-RW the motion picture (1979) as Enterprises leaps to warp 1, leaving a colourful light trail of colour behind it.

    I was suddenly thought there’s enough space behind the grill to baffle where the JBL badge logo is, what if I place a three segment LED type on small PCB glued to the back with the wires hidden. It would then produce a colourful bright backlighting effect when the lights are turned OFF.

    Now one of my friends dabbles in electronics for living as he teaches this each day at school and has he’s own production company. Now all I need to get from him is his opinion on LED type and size, I’m sure he’ll find it fascinating.

    I know the price of the LED’s is cheep and I only need 10 LED or maybe a few more extra?

    I was just thinking what about sticking inside the enclosure I mean I haven’t seen the light-bulb fuse light up since I’ve had the JBL control 1 as I keep levels within reasonable SPL db and it takes a bit of loudness to light them up.
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  9. #159
    JBL 4645
    Just placed a small deposit down on an LCD Hitachi CP-X430 video projector that is going was going for £225.00 now only £150.00 to pay off as the owners other half was kinder enough to lower it to £200.00.

    I’ll figure out what to do with it when I pick it up after final payment which, should be around May 2009.

    Bulb is new in the projector and finding a supplier like eBay or other as it would need back-up bulb and kitty box, to save up for the next bulb. I was told the cost is around £300.00 whoa! It’s no different than a cinema projector expect specifications of course.

    I’ll figure out a design to secure it to the ceiling at the back or wherever to give its optimum brightness and size width or diagonal size on diy screen.

    Well its something I’ve kinder wanted for nearly almost 10 years now.
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  10. #160
    JBL 4645
    Just found a site that stocks spare parts wow £216 whew that’s an expressive bulb

    I’ll keep this link for reference use later on.

    Can’t seem to find a pdf file or users manual on this model as of yet.

  11. #161
    JBL 4645
    Found this piece of information on it. It’s just too wet my, appreciate for now.

    The manual for Hitachi CP-X430 LCD projector is not from because the link to the manual in Hitachi website is not found. Reason being [The link from the referring page may be either invalid, the URL may have been mistyped or the page may have moved due to our redesign.].

    Thus I tried to search from other website and finally I found a copy on

    Inside the manual you will find these aspects on CP X430:
    1. Before use: here you can check on the content of the package
    2. Installation: cabling and example of system setup
    3. Operation: basic operation and menu options
    4. Maintenance: Lamp, air filter and other maintenance
    5. Troubleshooting, specification and warranty.
    Specification of CP-X430

    Item Specification
    Product name Liquid crystal projector
    Panel size 2.3 cm (0.9 type)
    Drive system TFT active matrix
    Pixels CP-X430:786,432 pixels (1024 horizontal x 768 vertical)
    CP-S420:480,000 pixels (800 horizontal x 600 vertical)

    Lens Zoom lens F=1.7 ~ 2.1 f=36.8 ~ 47.8 mm
    Lamp 250 W UHB
    Speaker 1.0W+1.0W (stereo)
    Power supply AC100 ~ 120V, 4.5A / AC220 ~ 240V, 1.9A
    Power consumption 410W
    Temperature range 0 ~ 35°C (Operating)
    Size 360 (W) x 106 (H) x 256.5 (D) mm
    Weight (mass) 4.5 kg
    RGB IN Video: Analog 0.7Vp-p, 75? terminator (positive)
    H/V. sync.: TTL level (positive/negative)

    Composite sync.: TTL level

    D-sub 15-pin shrink jack

    DVI (CP-X430 only) TMDS, DC: 150~1200 mV / AC: 1.56 Vp-p
    TTL Level (Positive/Negative)

    AUDIO IN 200mVrms, 50 k? (max. 3.0Vp-p)
    Stereo mini jack

    VIDEO IN 1.0Vp-p, 75? terminator
    RCA jack

    S-VIDEO IN Brightness signal: 1.0Vp-p, 75? terminator
    Color signal: 0.286Vp-p (NTSC, burst signal),75? terminator

    0.300Vp-p (PAL/SECAM, burst signal),75? terminator

    Mini DIN 4-pin jack

    COMPONENT VIDEO Y - 1.0 Vp-p, 75ohm Terminator (Positive)
    CB/PB - 0.7 Vp-p, 75ohm Terminator (Positive)

    CR/PR - 0.7 Vp-p, 75ohm Terminator (Positive)

    AUDIO IN L - 200mVrms, 50 k ohm (max. 3.0Vp-p)
    R - RCA jack

    RGB OUT Video: Analog 0.7Vp-p, 75? output impedance (positive)
    H/V. sync.: TTL level (positive/negative)

    Composite sync.: TTL level

    D-sub 15-pin shrink jack

    AUDIO OUT 200mVrms, output impedance 1 k ohm (max. 3.0Vp-p)
    Stereo mini jack

    Control functions CONTROL - D-sub 15-pin shrink plug
    USB - USB jack (B type)

    Optional Parts Lamp: DT00471
    Air Filter: NJ06131

  12. #162
    JBL 4645
    Just found this brief pdf file description on the CP-X430 that gives details like screen size distances, input signals, and 16:9 mode and more

    2,500 ANSI lumens
    • Native XGA resolution
    • 9.9 lbs
    • 2 RGB inputs and RGB
    output/DVI inputs
    • Manual zoom/manual focus
    • Contrast ratio 350:1
    • HDTV theater ready
    • FCC class B
    • Component/composite/S-video
    • Vertical & horizontal keystone correction
    • “My screen” (user programmable start-up screen)
    • Reverse image function for ceiling mount
    • Remote control with laser pointer
    • Whisper mode 36dB
    • 16:9 mode
    • Digital zoom/freeze function
    • Switchable IR receiver for
    remote controller
    • Gamma correction
    • Supplied with soft case
    • Kensington security slot
    • Picture in picture

    Model name CP-X430 series
    Liquid crystal panel structure 0.9” polysilicon active-matrix TFT x 3
    Number of pixels 786, 432 pixels (H 1,024 x V 768)
    Resolution Video 540 TV lines
    RGB 1024 dots x 768 lines
    Colors 16.7 million colors
    Aspect ratio Native 4:3/16:9 compatible
    Lens Manual zoom 1:1.3 (F1.74 - 2.08)
    Throw ratio (distance:width) 1.94 ~ 2.57 : 1
    Lamp 250W UHB
    Expected lamp life Approx. 2,000 hours
    Brightness 2,500 ANSI lumens (2,000 ANSI lumens in whisper mode)
    Contrast ratio 350 : 1
    Speakers 1W x 2
    Power supply AC100-120V/AC220-240V 50/60Hz
    Power consumption 410W
    Operating temperature 0°~ 35°C (32° ~ 95° F)
    Input signals RGB VGA, SVGA, XGA, SXGA (COMPRESSED), MAC13”, MAC16”
    Composite video NTSC, NTSC4.43, PAL, PAL-M, PAL-N, SECAM, PAL60, S-video
    Component video 480i, 575i, 480p, 1,080i, 720p
    Acoustic noise level 40dB (36dB in whisper mode)
    H sync 15kHz ~ 80kHz
    V sync 50Hz ~ 120Hz
    Vertical keystone correction Digital keystone +/- 15°
    Horizontal keystone correction Digital keystone +/- 5°
    Approvals UL, C-UL, FCC Class-B, CE, TUV
    RGB input Digital RGB DVI x 1
    Analog RGB 15-pin D-sub connector x 2
    Audio Stereo mini jack x 2
    Audio output Stereo mini jack x 1
    Video input S-video Mini DIN 4-pin connector x 1
    Composite video RCA jack x 1
    Component video RCA jack x 3
    Audio RCA jack x 2 (L/R)
    Control terminals 15-pin D-sub connector x 1
    USB connector (USB mouse) x 1
    Compatible controls PS/2, ADB, Serial
    RS-232C (Serial)
    Dimensions 14.2” x 4.2” x 10.1” (W x H x D)
    Weight 9.9 lbs.
    Supplied accessories Remote control with laser pointer, PS/2 mouse
    cable, batteries (AA), power cord, RCA
    component cable, RGB cable, multiple language operator/
    safety manual, soft case
    Lamp CPX430LAMP (Part #: DT00471)

    Screen Size 4.3 Throw distance
    Diagonal* Width* Min* Max*
    40 32 62 82
    60 48 94 123
    80 64 127 164
    100 80 160 205
    120 96 192 246
    150 120 241 308
    200 160 323 411

  13. #163
    JBL 4645
    Type of screen? Now I sure don’t have hundreds for screen so I’d have to look around at what is on hand and see if it can’t be put to some good use. Fabrics are not all that good it needs to have some degree of refractive gloss or neutral matt look

    Perforated is important to allow the sound to pass though.

    I wonder if there’s any second hand screens going or maybe new ones at revolutionary low price.

    Mounting it would have to be closer to the upper middle rear ceiling.

    One thing is clear thou I won’t be using this all the time, due to bulb life 2,000 hours. I’d use it for new films or the odd one now and then, but use the SONY CRT for most regular viewing, so I’d have to make screen that can be removed kinder like pull down screen but perforated.

    At most its 83 days running time at full, halve that and it should give around 1 year at best. That would mean around few films once every week average is 2 hours, hmm, yeah about a 1years worth out of the bulb damn costly.

    Average domestic light-bulbs don’t even cost no more than £1.00 pound today and some might last just over 1 year. Sigh, the price you have to pay for life’s little luxuries these days sigh.

  14. #164
    JBL 4645
    Been looking at alternatives like pre-made video projection screens but as of yet can’t find a realistic price with a perforated screen. Costs can run as high as near to £grand.

    I’ll have to visit fabric shop around May and see what types of white fabric that can be used as projection screen. Even some fabrics can cost quite a bit per square metre.

  15. #165
    JBL 4645
    Just got off the phone with a friendly chap where I was asking for perforated screens. He said we don’t stock them and replayed some company’s that do supply perforated screens micro screens due to the different size in perforations VS distance.

    I knew instantly what he meant about some customers complaining about seeing the regular cinema screens due to the size in perforations and VS distance. In a cinema front seats are at least 20 feet or more away from the audience.

    In the home you’re considerably a lot closer due to the room size length.

    I wanted to look at my options for screen as I was thinking about a bed sheet not that there is anything wrong with the idea, it just won’t have the refractive surface.

    So I thought how about taking a hobby drill as this is for model making and drill bits are very tiny for precession model drilling. Now if I can look at sample micro perforated screen or use it as (template) placed over a none perforated screen I could drill out the parts of the screen I need.

    For example if screen speaker is placed LCR at given distance width and height of speaker as well, all that I need to do is drill the holes for the width and height and yes it would take days if not weeks to do this.

    Also due to drilling small perforated holes and only in three locations might, stick out like a soar thumb with kinder grey tone look, maybe?

    Anyway the chap is sending me two samples to look at so I can evaluate and make decision to go with non-perforated and modify it for less of the cost or track down a suppler for perforated screens and pay a bit more.

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