Martin Audio VRS800 18" driver recommendations |
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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Posted: 01 December 2016 at 7:31pm |
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Hi. I have some Martin Audio VRS800's which I am in the process of refurbishing. Unfortunately 1 of the 18 inch drivers is rubbing and the other has a slipped magnet so reconing is not an option. The original drivers are B18-1000 which had a double suspension. I read somewhere that a FTR18-4080 would be a good alternative but i am unsure which one as there are 3 varients:
Edit: This is the thread I was referring to: http://forum.speakerplans.com/martin-f1-bass-box_topic31739_page2.html Maybe someone could even recommend a known suitable alternative as I was trying to avoid the higher power drivers as it would mean I would need to get another amp. The B18-1000 was specced as 300W RMS 600W peak in this box. Edit: I have a more powerful sutitable amp that I could use if necessary. Edit: I have been able to find the T/S parameters of the original driver, B18-1000: Power Handling: 1000w Highest X-over Freq (Hz) 300 Voice coil diameter (mm) 100 Voice coil Lenght (mm) 19.0 Mag.Grap Flux Density (T) 1.33 Mag.Gap Depth (mm) 9.5 Mag. Weight (oz) 126 Average Sensivity (dB / w @ 1m) 98 Thiele-Small Parameters Free Air Resonance (fs, Hz) 30.0 DC Resistance 5.8 Effective Diameter (d, m) 0.38 Equivalent Volume (Vas, I) 345 Total Moving Mass (Mmt, m) 147 Electrical Q 0.306 Mechanical (Qms) 5.76 Total Q (Qts) 0.291 BI product 22.9 xmax 6.5mm Depth (mm) 202 Net Weight (kg) 15.0 Thanks, Mike FTR18-4080F 600W 18" Driver 8 Ohm Specifications: <ul ="with_dots"=""> Nominal diameter 457mm/18in 600W RMS 8 Ohms 97dB 30-3000Hz 100mm/4in Cast Aluminium Ferrite Round copper Glass fibre Glass loaded paper with weather-resistant impregnation Cloth-sealed Single 6mm/0.24in 10mm/0.39in 22mm/0.87in 3.1kg/110oz Small Signal Parameters: <ul ="with_dots"=""> 0.38m/14.96in 32.7Hz 158.22g/5.58oz 136.61g/4.82oz 5.24 0.32 0.30 5.31 Ohms 271.99lt/9.6ft3 23.31Tm 0.15mm/N 6.21kg/s 1.46mH FTR18-4080FD 1000W 18" Driver 8 ohm Specifications: <ul ="with_dots"=""> Nominal diameter 457mm/18in 1000W RMS 8 Ohms 97dB 35-2500Hz 100mm/4in Cast Aluminium Ferrite Round copper Glass fibre Glass loaded paper with weather-resistant impregnation Cloth-sealed Double 6mm/0.24in 10mm/0.39in 22mm/0.87in 3.1kg/110oz Small Signal Parameters: <ul ="with_dots"=""> D 0.38m/14.96in 34.3Hz 126.39g 112.24 4.33 0.29 0.27 5.39 Ohms 395.56lt/13.96ft3 22.88Tm 0.22mm/N 6.506kg/s 1.41mH FTR18-4080HDX 1000W 18" Driver 8 Ohm Specifications: <ul ="with_dots"=""> Small Signal Parameters: <ul ="with_dots"=""> Edited by Pinyorouk - 02 December 2016 at 11:15am |
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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I have updated the post with the parameters for the Celestion B18-1000. The driver will be used in a horn application. Thanks.
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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I have been told by a very reliable source that the FTR are not as good as the Original Celestions that were made in the UK years ago. I will no longer need help with selecting a driver within that range. Thanks
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madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
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I think all Celestion stuff is made in China now, they closed UK production years ago (and dumped the workforce).
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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So Madoffin, that leads us to the next question, what driver please
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Jimmer
Old Croc Joined: 30 April 2010 Location: Stroud / Glos Status: Offline Points: 2604 |
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I used the rcf L18s801, but found it a little honky higher up. I then switched to a custom ATC remanufacture of the original Celestion driver, I was much happier. If I was looking again I would look at sticking the BMS 18S430v2 in them. I use these in some reflex cabs and did try them in the Martin F1b..... they worked very very well. Good luck on your quest, they will be a lovely set of full range speakers
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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Hi Jimmer. Thank you very much for your reply and suggestions. I didn't know that ATC remanufactured the original Celestion, interesting. Will look into purchasing the driver you suggested. I am pleased that the project will be worthwhile, thanks once again.
Edited by Pinyorouk - 03 December 2016 at 1:05pm |
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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Hi Jimmer, I looked into the BMS 18S430v2 and noticed that the upper frequency range is 200Hz. A suggestion was made that the RCF L18P300 would be a good alternative. My 12 inch drivers would come in around 220Hz so I am wondering if the RCF would be a better option as it's upper range is 1000Hz. I wish someone could compare the specifications of the two and see which one would suit this 3 way enclosure with horn loaded ported bass. Unfortunately I do not understand the T/S parameters but would like to look for the most suitable, affordable driver. I am sure there are members who could help Thanks Edited by Pinyorouk - 03 December 2016 at 1:34pm |
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tv00
Old Croc Joined: 10 August 2009 Location: Denmark Status: Offline Points: 1886 |
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Hello, my reconer fixes some slipped magnets and recenters scratching coils (if contact glue it can be dissolved & re-glued)
Also take a look at this driver, strong motor, light cone, cheap price: Resonant frequency (fs)
Edited by tv00 - 03 December 2016 at 5:25pm |
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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Hi, thank you very much. What is the model number of the driver please? If your reconer could fix my drivers slipped magnet it would really make my life easier. Could you please put me in touch with your reconer so that I can see whether it can be fixed. Have some time next week to travel so distance isn't an issue. Thanks. Edited by Pinyorouk - 03 December 2016 at 5:34pm |
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tv00
Old Croc Joined: 10 August 2009 Location: Denmark Status: Offline Points: 1886 |
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LOL, I don't know if I dare tell you:
It's the IMG Stage Line SP-46/500PA steel-chassis:-) But it costs more than I think a driver of that kind should, perhaps you can get a nice offer, I got 4 hardly used for nothing in a trade (gone). On the good side is relatively light weight. I'm in Denmark, so is my reconer. But there's people in UK fixing slid magnets I know for sure! I'm not sure all reconers know the trick of dissolving a kit, but they should be able to do it, I saved a few drivers by re-centering that way. Edited by tv00 - 03 December 2016 at 7:24pm |
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tv00
Old Croc Joined: 10 August 2009 Location: Denmark Status: Offline Points: 1886 |
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http://www.oberton.com/en/?option=com_content&view=article&id=163:18b450&catid=49:ferrite-loudspeakers
Edit: no, this one: http://www.oberton.com/en/products/ferrite-loudspeakers/162-18b500.html Fs
Qms
Qes
Qts
Vas
Mms
Re
Sd
Xmax*
Cms
BL
Le at 1kHz
34.90 Hz Edited by tv00 - 03 December 2016 at 7:27pm |
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