New Projects Forum - Right guys I need help!

Right guys I need help!

Printed From: Speakerplans.com
Category: Plans
Forum Name: New Projects Forum
Forum Description: Forum for new speakerplans projects, in memory of Tony Wilkes, 1953 - 2014
URL: https://forum.speakerplans.com/forum_posts.asp?TID=81055
Printed Date: 27 March 2026 at 5:32am
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Topic: Right guys I need help!

Posted By: MilitantYouthSounds
Subject: Right guys I need help!
Date Posted: 08 August 2013 at 6:10pm

Right i have two 1508-8 HE SF drivers lying around and I need advice on wether to make a scoop each out of them or make a single dual 15" reflex cab? Anyone got any advice, guidance etc. Some dual 15" reflex plans would be great! Also im using these in a Dub/Reggae Soundsystem so want that smooth bass that the popular soundsystems produce! Thank you in advice!

Replies:

Posted By: craig582
Date Posted: 08 August 2013 at 7:15pm

i would say 2 single 15" reflex, download winisd, put the parameters in, then see what you can get after having a play,

Impedance: 8 Ohms
Power capacity: 2000 W Peak 1000 W Program 500 W Continuous
Sensitivity: 100.3 dB / 1 W 1 m
Usable freq. range: 40 Hz ~ 2 kHz
Cone: Kevlar® impregnated cellulose
Voice coil diameter: 4.0" / 100 mm
Voice coil material: Aluminum ribbon wire Polyimide-impregnated fiberglass former Nomex® stiffener Solderless diffusion welded OFHC copper leads
Net weight lb. / kg: 17 lbs. / 7.7 kg
Znom (ohms) 8
Revc (ohms) 5.32
Sd (Square Meters) 0.084
BL (T/M) 16.04
Fo (Hz) 51.2
Vas (liters) 182.4
Cms (uM/N) 182.0
Mms (gm) 52.90
Qms 10.60
Qes 0.352
Qts 0.341
Le (mH) 0.34
SPL (1W 1m) 100.3
No (%) 6.70%
Vd (cu. in. / ml) 19.5 / 319
Pmax (Watts pgm.) 1000
Disp (cu. in. / ml) 197/ 3229
Xmax (mm) 1.9
15"

give it a go, it will be more rewarding knowing you designed them, plus if you put the best response graphs up here, we will be able to help you get the best out of them :)

Hope this helps

Posted By: b grade
Date Posted: 08 August 2013 at 7:19pm

Not scoops. Make some BRs. I would make a pair of them, personally. Easier to carry.

I assume you do not use Bass box or WIN ISD, so maybe an online calculator would help.

http://www.mh-audio.nl/ReflexBoxCalculator.asp" rel="nofollow - http://www.mh-audio.nl/ReflexBoxCalculator.asp

By a quick calculation you could make a box with an Fb of 56.63hz and an F3 point of 60.03hz with a box volume of 124.77L (add more total volume depending on how much volume will be taken up by the driver and braces and such). The vent area could be about 177.89 cm^2 and 18mm (thickness of the wood) long.

I am not saying that this is your only option, you can mess with the volume and get a louder box with less low extension or change the vent to be smaller or longer or multiple vents, just you will need to mess with the numbers. This will not be a subwoofer but it should play pretty deep for midbass/kick. Your drivers have an FS too high for true sub. It is a big box, and you can make it smaller, but the port alignment frequency will get higher.

Really, if you are after sub, sell the black widows, or use them as the woofer in 3 way mid tops.

Posted By: rffrecords
Date Posted: 08 August 2013 at 7:40pm

This peavey woofer is intended as a midrange in very big 4-way PA system. The sensitivity of 100.3dB (which is not exagerated a bit) and the tiny xmax of 1.9 mm give it away at first sight.

You can't give more than say 100 watts if you don't high pass it at least at 120 Hz. Ideally is to be crossed to a dedicated kick at 225 Hz if one want to make use of it's full SPL capabilty.

I am sure eighteensound has a similarly spec'ed 15 inch midrange.

Posted By: MilitantYouthSounds
Date Posted: 08 August 2013 at 9:54pm

Thanks everyone but im having a problem? How do i calculate the vdr?:S

Posted By: craig582
Date Posted: 08 August 2013 at 10:01pm

Have a read of this, suggested box sizes etc, including VD
http://%20assets.peavey.com/download.cfm?file=/literature/specs/116637_13789.pdf&name=1508-8_HE_BWX%28TM%29_.pdf%20" rel="nofollow - http://assets.peavey.com/download.cfm?file=/literature/specs/116637_13789.pdf&name=1508-8_HE_BWX(TM)_.pdf

Posted By: b grade
Date Posted: 09 August 2013 at 12:24am

Use the suggestion in the link above. My earlier suggestion, the vent seems not to jive with their recommendation so the calculator may have been off or something. Probably best to go with Peavey's recommendations.