18sound in Horn 186
Printed From: Speakerplans.com
Category: Plans
Forum Name: 1850 and 186 horns
Forum Description: Discussion / Questions about the 1850 and 186 horns
URL: https://forum.speakerplans.com/forum_posts.asp?TID=38329
Printed Date: 27 March 2026 at 7:15am
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Topic: 18sound in Horn 186
Posted By: dj.elvis
Subject: 18sound in Horn 186
Date Posted: 19 April 2010 at 11:59pm
Hello,
I have some question for members. I have two horns 186 and i have problem with drivers.
Which Driver is better for this horn:
18sound 18LW1250 or Eminence Omega Pro 18?
Please for Answer
Thanx alot..
Piter
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Replies:
Posted By: noislinger
Date Posted: 24 April 2010 at 11:24am
18lw1250
Fs 35 Hz
Re 5 Ohm
Sd 0,1134 sq.mt. (175,7 sq.in.)
Qms 8
Qes 0,28
Qts 0,27
Vas 268 lt. (9,47 cuft)
Mms 142 gr. (0,31 lb)
BL 23,6 Tm
Linear Mathematical Xmax (7) ± 9 mm (±0,35 in)
Le (1kHz) 2,73 mH
Ref. Efficiency 1W@1m (half space) 98 dB
pd186
Fs 27 Hz
Xmax 9 mm
Revc 5.5 Ohms
Vd 1.035 10-4 m3
Qts 0.312
No 2.05%
Qms 7.75
Pmx 700 Watts
Qes 0.326
Cms 188 µM/N
Vas 353 Litres
Mms 184 grams
Sd 1150 sq cm
BL 22.94 T/m
omegapro18
Resonant Frequency (fs) 25hz
DC Resistance (Re) 5.20
Coil Inductance (Le) 1.67mh
Mechanical Q (Qms) 8.81
Electromagnetic Q (Qes) 0.32
Total Q (Qts) 0.31
Compliance Equivalent Volume (Vas) 548.7 ltr/19.4 cu. ft.
Peak Diaphragm Displacement Volume (Vd) 556cc
Mechanical Compliance of Suspension (Cms) 0.29mm/N
BL Product (BL) 18.8 T-M
Diaphragm Mass inc. Airload (Mms) 138 grams
Efficiency Bandwidth Product (EBP) 79
Maximum Linear Excursion (Xmax) 4.8
Surface Area of Cone (Sd) 1159 cm2
Maximum Mechanical Limit (Xlim) 16mm
Qts and Vas determine box volume.
For the flattest frequency response in a closed box, Q = 0.7.
For less low extension and a boost in remaining low response, the box should be made smaller and Q > 0.7.
For a lower extension but a loss in existing low response, the box should be made larger an Q < 0.7.
for a sealed box a qts of 0.38 will require a box volume = Vas to produce a -3db low-cut at fs (theoretically). Q = 0.7
for a sealed box a qts of 0.2 will require a box volume well below Vas to produce a -3db low-cut well above fs. Q = 0.7
for a sealed box a qts of 0.5 will require a box volume well above Vas to produce a -3db low-cut well below fs. Q = 0.7
you can see that the 18sound has a lower Qts and a lower Vas than the 186. so it would prefer a smaller rear chamber.
the eminence has a similar qts (0.31:0.3) but has a much larger Vas (556:353) so would prefer a larger chamber. the eminence has a low fz but a weak xmax (cannot move much air) so is likely to have a worse bass response than the 186.
the 18sound would be better off in the 1850horn.
out of the two id go for the omega pro in the 186, unless you can affors the pd.
lower qts drivers have stronger motors and are in my opinion better.
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http://www.totemaudio.co.uk/" rel="nofollow - www.totemaudio.co.uk/
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Posted By: breakdabeat pete
Date Posted: 25 April 2010 at 4:43pm
id rather stick the 18sound in a 186 horn than eminence any day!
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Posted By: ceharden
Date Posted: 25 April 2010 at 6:02pm
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The 18LW1400 has been used in the 186 horn to good effect.
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