Reflex Design For Pd.186 |
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Adam_Iron_Horse
Old Croc Joined: 02 January 2010 Location: Scotland Status: Offline Points: 2043 |
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To answer your question I don't own kick bins. I should probably explain, we play DnB, Garage, Dubstep (old bass heavy stuff), House, (pretty much a real mix of music) with a pair of x12s on top. But pretty much I want a good all round bin that kicks and gets decent low extension, at the moment with the g-sub it sounds okay but as Iv mentioned the size and the fact its a double is the problem. (Our regular venue has a lot of stairs). But its came to the time when we can afford another sub (or pair in this case) so were wanting to build 4 single 18s that would suit the pd.186 At the moment the high pass on our sub is set around 39Hz which seems to be more than enough low extension but more is always welcome but I think Id prefer a nice Kick. Is the port resonance the port gain in WinISD? |
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Is a proven design that works for many drivers unmodified. Some say 2x of these outperforms 1x Gsub. Edited by levyte357- - 30 April 2013 at 7:42pm |
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Global Depopulation - Alive and Killing.
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Adam_Iron_Horse
Old Croc Joined: 02 January 2010 Location: Scotland Status: Offline Points: 2043 |
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Much appreciated, I know of a local guy that has a pair of these may see if i can get hold of them to have a listen to them before I go and build anything...
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Adam_Iron_Horse
Old Croc Joined: 02 January 2010 Location: Scotland Status: Offline Points: 2043 |
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Saying that though still welcome to other suggestions...
Just wanna get a design Ill be happy with all round and then can just continue expanding... |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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The majority uses an electronic crossover on their 18-inch drivers. It is common to use a starting point on the crossover anywhere from 80 - 100 Hz for an 18-inch reflex cabinet. How is the Le going to play a factor when the electronic crossover determines the starting point of the frequency sent to the woofer considering the Le comes into play above the tuning frequency settings of the crossover? Best Regards, |
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Elliot Thompson
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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http://www.speakerstore.nl/constructions
They have helpfully mirrored the Sub18 and the rest of the old B&C designs. There is an 18Sound Kit18 design which is almost identical and probably also suitable. Personally I prefer shelf ports rather than the round ports of the old Fane Design so I would go Sub18 or similar. |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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Below are the curves for the PD186 in 200l tuned to 35Hz, the Yellow one with Le = 0 and the Blue with it set to match the impedance at 1000Hz to the value on the spec sheet, ie 16Ohms. Although no-one's really going to use the driver up at 1kHz, there is still a difference of over 1dB @ 100Hz, not a disaster but we might as well model as accurately as we can when the tools are freely available. In particular, if you try to get a properly smooth crossover from subs to the next bandpass up that difference in level and the shape of the response in the low mid range will throw off the alignment to some extent. I've used 750W to model this, and interestingly the peakier response above Fb also results in more excursion around 50Hz when modelled without accounting for Le as well. Regards, David.
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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A +1 dB gain is not going to mean anything for bass. It takes +3 dB change for the average person to notice a difference. A 1 dB differential is like comparing a 100-watt amplifier to a 125-watt amplifier. If you want something accurate it would be best to literally measure the frequency response of the cabinet using measuring software & a microphone. You will also need to measure the TS Parameters of the driver in question. WinISD, Bassbox Pro in addition to Horn Response are simulators. Best Regards, |
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Elliot Thompson
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rffrecords
Registered User Joined: 06 February 2010 Location: Greece Status: Offline Points: 91 |
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No. You can find the port resonace in Winsd in the third tab of the project window which has the title "vents". Actually what winsd calls the 1rst resonance is the second one. The first one sits one octave below the second one (half the frequency) and is usually the most severe. I did some calculations on the Gsub plan. Total internal volume is 330 Ltrs. Subtraction of the port and the braces leaves it with 300.9 Ltrs. Still one has to subtract the volume occupied by the woofers to come down to the net internall volume. I don't know this volume because I am missing the info on the diameter and the depth of the magnet. Anybody that can measure them let me know. From experience with 18 inch woofers the net internall volume of the G Sub must be between 290-295 Ltrs. So half a G sub uses 145-147.5 Ltrs. Adam, if you find that the G Sub suits your ears and your program very well and if you changed a thing you'd trade a tad of subbass for kick, then stay away of 200 or 185 Ltr boxes and use no more than 147.5 Ltrs. |
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Adam_Iron_Horse
Old Croc Joined: 02 January 2010 Location: Scotland Status: Offline Points: 2043 |
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Okay thanks for that... A Half G-sub kinda size would be nice for us to transport and store really as well. The only thing is I do feel the g-sub a bit lacking in kick and low extension maybe a little bit. |
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