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JohnDaBass

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Everything posted by JohnDaBass

  1. JohnDaBass
    Hi All, I have checked the tuning frequency of both Mk1 & Mk2 cabs using the online tone generator and grains of rice. I have also rechecked all the as built internal dimensions and actual port aperture sizes. John DaBass DIY Mark 1 cab [attachment=229022:JDB_Mk1.jpg] cab is 12mm ply with an 18mm baffle set back 35mm from port mouth. Internal 235 x 545 x 430 Volume = 55Ltrs Port 33 x 475 x 230 ( port area is 156 sq Cm or equivalent to a 140mm diameter round port) Measured tuning frequency = 51Hz The simple www.linearteam.dk calculator estimates that the tuning frequency should be around 50Hz This is the cab that the Beymer SM212 may have been damaged. John DaBass DIY Mark 2 cab[attachment=229023:JDB_Mk2.jpg] cab is 18mm ply Internal 245 x 494 x 445 Volume = 53.86 Ltrs Ports four ports 66mm Diameter 180mm long Measured tuning frequency = 61Hz The simple www.linearteam.dk calculator estimates that the tuning frequency should be around 58Hz If I increase the port length to 230mm the tuning frequency should be close to 52Hz There has been no issues with the Beymer SM212 in this cab. I apologise to everyone as perhaps I should have started this post in the Build Diaries thread.
  2. JohnDaBass
    Weekend Bump and reminder that this combo is in excellent condition!!
  3. JohnDaBass
    Hi Stevie, Thank you for your contribution. I will try the rice test on both Mk1 & Mk2 cabs with the same good speaker and post the results. So am I correct in my understanding that because the port tuning frequency was too high I actually drove the speaker voice coil beyond it's allowable travel limit (Xmax). So damaging the speakers performance. I have to say that I was unware of the dangers of such a mismatch of port tuning and Xmax. I always thought that when the speaker got to its limit it would complain a bit and that would be the time to reduce the juice. It just goes to show how much us novices can learn from guys like you and Phil. Thanks for your valuable help and experience. John
  4. JohnDaBass
    Trace Elliot 1215SMX combo details H590mm W610mm D 335mm weight 30Kg
  5. JohnDaBass
    Hi Phil, Thank YOU for your analysis.The cab and speaker really sounded great but sadly the speaker is 6 weeks outside the 12 month warranty period. I plan just to buy another SM212 from Bluearan. Thank you again for your continued help and support to all of us on Basschat! I am sure that there are many on here who, like me go straight to any new posts from an Ol'Sage like you. Thanks John
  6. JohnDaBass
    Pm'd John
  7. JohnDaBass
    Hi Phil Gear details cab in my DIY Mark 1 internal 245x425x540 external 566x440x300 vol 56.23lts shelf port 540x35x230 Amp Fender Rumble 500 head settings gain 7 o clock (minimum) Bass 3 o clock Low Mid 12 o clock - flat High Mid 12 o clock - flat Treble 12 o clock - flat Master 9 o clock No effects or pedals. Guitar Fender active PJ Volume max pan P pup solo T M B all set middle position - flat I hope this helps with throwing some light on the root cause of the speaker failiure. The speaker is not dead (Voice coil open circuit) just very distorted with loud random 'clicking' noise from open A downwards. I have no problems with my DIY mark 2 cab (the one you suggested adding the fourth port) now that it has four ports 66mm dia and 180mm long. Brs John
  8. JohnDaBass
    Out of town at the moment send them to you on Wednesday
  9. JohnDaBass
    Has anyone experienced any quality or performance issues with these drivers? I have blown one driver and I was wondering if anyone else has had similar issues. Thanks for you feedback. John DaBass
  10. JohnDaBass
    Monday morning BUMP
  11. JohnDaBass
    Bump for any new buyers
  12. JohnDaBass
    Holiday bump back at end of September
  13. JohnDaBass
    Fender PJ active or EBMM Sterling both with flats into a Fender Rumble 500 V3 head into a Barefaced Super Compact 1x12 plus a BassChat 1x12 when reqiired. Plenty of old school thick heft on tap!
  14. JohnDaBass
    Bump for price reduction to £275
  15. JohnDaBass
    NOW REDUCED TO £140
  16. JohnDaBass
    Great upgrade for any Fender Jazz Bump
  17. JohnDaBass
    Great sounding amp ---- weekend Bump
  18. JohnDaBass
    PM sent
  19. JohnDaBass
    1st Bump
  20. JohnDaBass
    1st Bump
  21. JohnDaBass
    I do not have any experience of the GK MB210 but I have used a Fender Rumble 500 head with a Barefaced Super Compact and its a great rig. Offers a loud broad range of amp styles with loads of low end. Try both and see what sits your needs. Brs John
  22. JohnDaBass
    Hi All , I have for sale a pair of Fender Lace Sensor Pickups and matching Kubicki pre-amp. The preamp and pickups were carefully removed from a my 1992 Fender Jazz Plus Deluxe bass. [size=4][font=Arial][color="#000000"]Phil Kubicki-designed active/passive circuit is similar to that of today's American Deluxe basses.[/color][/font][/size] [size=4][font=Arial][color="#000000"]The active stacked bass tone circuits he innovated are called "Kubicki Tone Circuits."[/color][/font][/size] [size=4][font=Arial][color="#000000"]The Active pre-amp is in fully functional working order. [/color][/font][/size] [size=4][font=Arial][color="#000000"]The matching set of Fender Jazz Lace Sensor pickups were the early low noise Jazz pickups which retained the true depth, honk and glass-like highs of Fender Jazz.[/color][/font][/size] [size=4][font=Arial][color="#000000"]l am prepared to sell separately for the right offer.[/color][/font][/size]
  23. JohnDaBass
    [size=5][b]SOLD [/b][/size] [size=4]To a very good home of a BassChatter!!!![/size] Hi All, I am in the process of de-cluttering and have for sale my Trace Elliot GP12 SMX 1x15 bass combo. I purchased new in 1999. The amp has only been used occasionally and is in excellent condition. The [b]Trace Elliot Combo[/b] is a 300 Watt bass amplifier combo featuring [b]GP12SMX[/b] preamp with 1 X 15 special design Celestion speaker. The [b]Trace Elliot GP 12 SMX Combo[/b] features including Pre Shape, Valve, 12-band EQ, Compressor, Effects Loop and output Muting. The amp also features electronically balanced XLR DI outputs for pre-EQ/post-preamp left and right, left and right Line Outputs and two valve/tube driver stages for signal pre-conditioning before the power stage. [b]The Trace Elliot Combo Main Features Include:[/b][list] [*][b]GP12SMX[/b] preamp [*]Pre Shape Circuit [*]Valve Drive Circuit [*]12-band Classic Graphic EQ [*]Dual-band Compressor with Separate Controls for Each Hi and Lo Bands [*]Effects Loop with HI-Pass/Lo-Pass/Full Range Outputs, Left/Right/Mono Returns, Series/Parallel Switch and Level Control [*]Output Mute Switch, Active on all Outputs Except Tuner Out [*]Electronically Balanced XLR DI outputs for Pre EQ and Post Preamp Left & Right [*]Additional Speaker Output (8 Ohms Minimum Load) [*]300 Watts (4 Ohms) Output Stage (with additional speaker cabinet) [*]1X 15 Special Design Celestion speaker [*]Cabinet Tuned, [*]Lightweight Poplar Plywood Construction [*]Metal Handles and Protective Corners [/list] Pick up only from West Wales but I would consider a meet somewhere on the M4 as far as the Severn Bridge.
  24. JohnDaBass
    Hi All, I have just ordered Beyma SM212 from Bluearan and I note that some of the sepecs have changed from those used by Phil &Co on the original Basschat 12 thread. Spec now Xmax 8.25 Vd 435ccs Freq range 45- 4000Hz Sensitivity 97dB 1W @ 1m Is it still okay to use in the Basschat Cab?
  25. JohnDaBass
    I have owned a Cube Bass 100 for over 8 years, I added extra porting to the rear to extend the internal speaker low end and added a parallel 2 xjack socket plate. I can run the internal speaker in parallel with an extension cab or just an external cab on it's own. The amp comfortably drives the two 8 ohm speakers at 4 ohms without any fuss or bother.Great flexibility for home or small pub venues.
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