PR's for the Blueprint 1803?

Discussion in 'Archived Threads 2001-2004' started by Jack Gilvey, Sep 6, 2001.

  1. Jack Gilvey

    Jack Gilvey Producer

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    Playing with more sims, it seems that fitting adequate porting in even a large box to do justice to the Blueprint 1803 is going to be difficult. I've not used them, but this is the point people usually start reaching for passive radiators.
    Which ones, in a group of 3 (the other sides of the box) would handle that kind of displacement? The only one I can think of is that 18" from Stryke.
    I'm picturing this project as a monster SPL machine for the ht room, as not as the last word in SQ.
    [Edited last by Jack Gilvey on September 06, 2001 at 08:59 PM]
     
  2. Brian Steeves

    Brian Steeves Second Unit

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  3. BryanJ

    BryanJ Auditioning

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    Jack why do you care so much about bass ?, is that all you care about when watching a movie ???
    Dont you allready have a few subwoofers ???
    I think one sub is good for you in your small room.
     
  4. Jack Gilvey

    Jack Gilvey Producer

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    Thanks for the suggestions, Ty. Maybe I should try one of those imaginary subs. [​IMG]
    [Edited last by Jack Gilvey on September 09, 2001 at 09:43 PM]
     
  5. BryanJ

    BryanJ Auditioning

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    Message removed, account suspended
    [Edited last by Rob Gillespie on September 10, 2001 at 07:35 AM]
     
  6. Geoff L

    Geoff L Screenwriter

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    Bigger, better, louder, faster, junkys and our fix... It's all good!
    Ground beef is good ~ steaks better, Why, just cause.
    Some like the boogie man.
    Reasoning can sometimes be so confusing.. But I understand.
    The bigger the monster, better the bite. You surely understand (why) now, right. [​IMG]
     
  7. Jack Gilvey

    Jack Gilvey Producer

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    [​IMG]
    Anyway, I received this info. from Pat at Blueprint regarding any PR they might be introducing:
    quote: We have had parts for the our PRs on order for a few months now. We are not
    holding our breath anymore. The cones are carbon fiber/nomex honeycomb
    composites with rubber surrounds. They are quite impressive in their
    excursion as well. We just can't get a straight answer (in dealing with
    overseas) as to when we will get them. So we are not posting anything on
    our sight until we get a more concrete answer.
    200 liters with 3 18" PRs and 2500 grams on each should do quite nicely in
    room. BUT, I hate to recommend anything until I have actually heard it
    play. This is only a computer model with averaged room transfer functions.[/quote]
    There goes one possibility.
    [Edited last by Jack Gilvey on September 10, 2001 at 10:58 AM]
     
  8. Greg Monfort

    Greg Monfort Supporting Actor

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    There's the Contrabass PRs:
    Sp = .129 m^2 (199.95"^2)
    Qmp = 3
    Mms = 1300 Grams
    Cms = 400 uM/N
    Fp = 4.8 Hz
    Xmax = 28.5mm = 2.25" peak-to-peak
    GM
    ------------------
    Loud is beautiful, if it's clean
     
  9. Jack Gilvey

    Jack Gilvey Producer

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    Thanks, Greg, those look killer. Are they available seperate from the sub, and what do they run? I didn't find any info. on the Servo-drive page.
     
  10. Greg Monfort

    Greg Monfort Supporting Actor

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    Part #88-1301, though I don't know the price. I imagine you'd have to order them through a SD distributor such as http://www.earlym.com/pages/kits.html
    GM
    ------------------
    Loud is beautiful, if it's clean
     
  11. Geoff L

    Geoff L Screenwriter

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    Certainly did not mean to offend anyone. Many of us enjoy our hobby to great extreams and love the DIY thing. Very rewarding!
    Was simply makeing light of it in response to anothers not so friendly post.
    Good luck Jack with the possible new BP monster. It would look to be an spl giant.
    Geoff
     
  12. Jack Gilvey

    Jack Gilvey Producer

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    Geoff, you certainly didn't offend me, your intent was exactly how I took it. [​IMG]
    Greg, thanks, I e-mailed them at earlym.com for info.
    [Edited last by Jack Gilvey on September 10, 2001 at 07:00 PM]
     
  13. Greg Monfort

    Greg Monfort Supporting Actor

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    JG, pls let me know as I'm curious now too. I haven't been keeping up lately, so what's the big deal with this new 'monster SPL machine'? Sims indicate it's outgunned by the Tempest (on less power), though it doesn't need nearly as large a cab.
    GM
    ------------------
    Loud is beautiful, if it's clean
     
  14. Jack Gilvey

    Jack Gilvey Producer

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    The one I'm referring to is the 1803, an 18". They also make the 1503, maybe this is the one to compare to the Tempest? I do find that, outside of an eq'd box (where the higher Fs of the driver wouldn't come into play, but the 45 P-P Xmax would), like a Linkwitz transform, the Tempest models better than the 1503. Certainly in an install like an IB, the Tempest is the clear winner. The Vas of the 1503 is much lower, as you noted.
    I'm only going by the published specs on the 1803, but with an Sd of 1217 cm^2 and an Xmax of 45mm P-P, it's got a Vd of about 5.5 liters for $249 ($229 pre-order). This compares rather favorably with the 3.3 liters of the HE15. Supposedly, the Xmech is in the neighborhood of 80mm. The Qts is low, and the Fs is listed at 25Hz, so it needs a pretty good size ported box to flatten things down to 20Hz.
    Even in 12ft.^3, an 8" port is 30" long with an Fb of 18Hz, and port speed still creeps higher than I'd like, so I figured PRs might be the way to go. That's where I stalled.
    Have a gander and tell me what you think:
    http://www.blueprintdrivers.com/1803.html
    I would be interested in your thoughts on that comparison, of course.
    p.s. Based on your recommendation of last February, I finally got hold of some 3/4" marine ply, which is sitting nice 'n flat in my garage.
     
  15. Greg Monfort

    Greg Monfort Supporting Actor

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    The 1803 is the one I compared to the Tempest. 11.7ft^3/16Hz Vs 5.5ft^3/16Hz. The 1803's extra excursion is really only useful in a sealed/IB design. At $229 though, that's cheap for this much Vb reduction. And of course 18" drivers look bitchin'. [​IMG]
    GM
    ------------------
    Loud is beautiful, if it's clean
     
  16. James W. Johnson

    James W. Johnson Screenwriter

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    Damn Jack I wish we were neighbors, we would have all sorts of fun building new subs with these Blueprint drivers!
    I think I am going to stick to a basic vented design using big boxes and ports. I have never tried a PR sub before but from what I have read it seems to be a good route to go if you are limited on space. I considered sealing my 1803s but doing this takes away too much low end, I have experimented with sealed subs quite abit and have never made one that I really liked.
    How about this for two 1803s with 2000watts , just add a little EQ to the low end and your all set..
    Driver : Blueprint 1803
    Number of drivers : 2
    Box type : Vented
    Box size : 20.000 ft^3
    Tuning frequency : 20.00 Hz
    Vent : 1 vent(s)
    19.83 in length for each
    10.00 x 8.00 in rectangle
    Relative
    Freq Gain SPL
    [Hz] [dB] [dB]
    20.00 -6.25 121.87
    25.00 -4.44 123.68
    30.00 -3.76 124.36
    35.00 -3.26 124.86
    40.00 -2.82 125.30
    45.00 -2.45 125.67
    50.00 -2.14 125.98
    55.00 -1.87 126.25
    60.00 -1.65 126.47
    65.00 -1.46 126.66
    I have my heart set on something like this [​IMG]
    6000 watts applied
    Driver : Blueprint 1803
    Number of drivers : 6
    Box type : Vented
    Box size : 45.000 ft^3
    Tuning frequency : 22.00 Hz
    Vent : 1 vent(s)
    13.28 in length for each
    20.00 x 10.00 in rectangle
    Relative
    Freq Gain SPL
    [Hz] [dB] [dB]
    20.00 -8.42 129.25
    25.00 -5.08 132.58
    30.00 -3.67 134.00
    35.00 -2.89 134.77
    40.00 -2.37 135.29
    45.00 -1.98 135.68
    50.00 -1.68 135.98
    55.00 -1.44 136.22
    60.00 -1.25 136.41
    65.00 -1.09 136.57
     
  17. Jack Gilvey

    Jack Gilvey Producer

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  18. Greg Monfort

    Greg Monfort Supporting Actor

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    Thanks for the link! I don't understand either of ya'lls alignments as they are both underdamped, especially JJ's. Do ya'll factor in thermal compression?
    GM
    ------------------
    Loud is beautiful, if it's clean
     
  19. Jack Gilvey

    Jack Gilvey Producer

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  20. Chris Sherman

    Chris Sherman Second Unit

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    "Imaginary subs" huh? Well you and Ty actually have a lot more in common than you would probably care to admit. You both seem to spend a lot more time talking about building subs than actually building them. Here's an idea, how about spending a little less time posting on the message boards and more time building subs and then posting some pictures. Let's see some of your handiwork. [​IMG] [​IMG]
     

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