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Eminence Sigma Pro-18A v1 Spec Sheet |
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ethnbh0110 
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Joined: 05 May 2025 Status: Offline Points: 6 |
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 Topic: Eminence Sigma Pro-18A v1 Spec SheetPosted: 11 September 2025 at 3:04pm |
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Hi all,
I have a pair of both the Eminence Sigma Pro 18-A v1s and v2s. I am struggling to find specs for the v1s anywhere online. Eminence only advertise the spec sheet for the v2 and there doesn't seem to be any record of the v1 which were released in the 90s and have a purple label on the back. Reaching out to see if anyone here has a spec sheet for them or has any leads on why there isn't any existing information about them. I am cautious about treating them as if there the same driver because they look physically different and the v2 will likely be an upgrade or a solution to an issue with the v1. Cheers, Ethan
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APC321
Young Croc 
Joined: 24 August 2013 Location: West Midlands Status: Online Points: 797 |
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Posted: 11 September 2025 at 4:49pm |
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Try emailing Eminence on info@eminence.com
I have found them very helpful for answers to this kind of question. |
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ethnbh0110
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Posted: 11 September 2025 at 4:58pm |
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Hi,
Thanks for your prompt reply. I have emailed eminence but they haven’t got back yet, only with an automated message saying to read their FAQs. Maybe I just need to be a bit more patient, haha! Cheers Ethan
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APC321
Young Croc
Joined: 24 August 2013 Location: West Midlands Status: Online Points: 797 |
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Posted: 11 September 2025 at 5:46pm |
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I hope that Eminence give you an answer to your question, rather than being yet another audio company to reduce it's customer service.
Fingers crossed... |
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ethnbh0110
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Posted: 11 September 2025 at 6:07pm |
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Appreciate the advice, and I hope so too!
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cravings
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Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7507 |
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Posted: 11 September 2025 at 6:10pm |
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from archive.org, 2002
Nominal Basket Diameter 18", 457.2mm Impedance 8 ohm Power Rating 500W rms Resonance 28Hz Usable Frequency Range 25Hz - 2.5kHz Average Sensitivity 1W @ 1m 100 dB Magnet Weight 95oz. Gap Height 0.375", 9.52mm Voice Coil Diameter 3", 76.2mm Mounting Information Overall Diameter 18", 457.2mm Baffle Hole Diameter 16.56", 420.5mm Front Sealing Gasket fitted as standard Rear Sealing Gasket fitted as standard Mounting Holes Diameter 0.25", 6.4mm Mounting Hole B.C.D. 17.25", 438.2mm Depth 8.15", 207mm Shipping Weight 27.2 lbs, 12.4 kg Thiele-Small Parameters Resonant Frequency 28Hz Impedance (RE) 6.29 ohm Coil Inductance (Le) 1.90mH Electromagnetic Q (Qes) 0.30 Mechanical Q (Qms) 8.28 Total Q (Qts) 0.29 Compliance Equivalent Volume (Vas) 441.2 liters 15.58 cu. ft. Peak Diaphragm Displacement Volume (Vd) 688cc Mechanical Compliance of suspension (Cms) 0.24mm/N BL Product (BL) 22.1 T-M Diaphragm Mass inc. Airload (Mms) 130 grams Equiv. Resistance of mechanical suspension loss (Rms) 2.81N*sec/M Efficiency Bandwidth Product (EBP) 95 Voice Coil Overhang (Xmax) 6.0mm Surface Area of Cone (Sd) 1140.1cm2 Impedance at Resonance (Zmax) 180 ohm Materials of Construction Kapton coil former Ferrite magnet Die-cast aluminum basket Polyamide-imide coated copper voice coil Paper cone/cloth cone edge Solid composition paper dust cap |
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ethnbh0110
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Posted: 11 September 2025 at 6:58pm |
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You’re an absolute legend. Do you think you could send me the link to the archive page where you found them please?
Cheers Ethan
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cravings
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Posted: 11 September 2025 at 8:04pm |
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Archive.org
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ethnbh0110
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Posted: 11 September 2025 at 8:53pm |
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I meant the url for the specific page but that’s fine. I will search it up myself.
Cheers Ethan
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Lucasdude
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Posted: 12 September 2025 at 12:16pm |
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DMorison
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Posted: 13 September 2025 at 3:33pm |
Note that apart from the reduced power handling, (500W vs 650W), those are the current specs per Eminence's website: https://eminence.com/products/sigma_pro_18a?_pos=1&_sid=588aaf204&_ss=r#specifications Now it might just be that the difference in power handling was the only difference between the older and current ones, but hopefully the OP will get the full info from Eminence in due course.
Edited by DMorison - 13 September 2025 at 3:45pm |
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cravings wrote: