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Multi-Way Conventional loudspeakers with crossovers

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Old 12th April 2003, 06:41 AM   #11
jleaman is offline jleaman  Belgium
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is that for one driver per box or 2?
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Old 12th April 2003, 06:58 AM   #12
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Quote:
Originally posted by JasonL
is that for one driver per box or 2?
Single. For 2 double the box volume to 1.06 ft^3 and a convienient port is 3" diameter 5" long or 4" 10" long

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Old 12th April 2003, 03:18 PM   #13
Bull is offline Bull  United Kingdom
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Bumper loudspeaker drivers are fairly good,they look very simular [materials and construction] to ZEUZ pa speakers and also look like Eminence speakers.

Bumper's best driver is a 700w rms 18 inch,which looks very well built,but the website does not say about what voice coil former they use or the x mech of the moving parts.
Voice coil formers[bobbins] are either paper,composition[ paper and aluminium],aluminium,kapton,normex ,fibreglass.
With Kapton being the most common for high power loudspeakers,but Normex is the best because it can stand 800 o C continous,where as Kapton can stand 350 0 c continous.

Jason L,the Bumper driver you choose is good and bad.
Good: 48 0z magnet for an 8 inch,175 w rms,stamped steel frame,
BL 10.60,2 inch voice coil diameter,frequency range 60hz-6khz,good 4.32 x max,vented pole piece.
Bad: low sensitivity for a pa driver 88.5 db SPL 1w at 1m, no indication of the x mech[maximum cone excersion],not very good quality cone or surround,no indication of what voice coil former was used.
This driver is not suitable for a subwoofer,but it's ok for bass and bass-mid.Being 88.5db average i'd only use it for hifi,for car or pa you need something more sensitive.[The more sensitive the speaker,the louder it sounds at the given volume].
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Old 12th April 2003, 03:48 PM   #14
Bull is offline Bull  United Kingdom
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If your going to buy more Bumper drivers,I think it's better to get the Eminence Beta 8 instead,doesn't cost that much more than the bumper driver,the Eminence driver is a much better driver than the Bumper driver.Eminence Beta 8 costs 40 inc vat each

Here are the specs: Eminence Beta 8a

Kapton coil former
polyamide-imide coated copper voice coil
APS ferrite magnet
pressed steel chassis
paper cone
plasticised cloth [linen] cone edge
solid compostion paper dust dome

8 inch diameter
8 0hm
225 w rms
55hz-4khz
resonance 58hz
average sensitivity 1w at 1m 97 db
magnet weight 38 oz
2 inch voice coil
vented pole piece
31 gauge copper wire
vd [peak diaphragm displacement volume] 65cc
EBP[ Efficiency Bandwidth Product] 163
X MAX 3.0mm
X MECH 15mm [Double this for maximum excersion before cone damage,so maximum excersion for this driver is 30mm or 3 cm].
BL Product 9.4 T-M

This driver is suitable for midrange between 400hz-4 khz,vocal pa,keyboards,discos,stage monitors,club systems,and bass guitar.
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Old 14th April 2003, 05:26 AM   #15
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lets get this straight.
you got a box. you got a driver. you dont liek the sound of the combination. you can change box or driver or both.

1. if you got drivers change box if yo have both then you dont have much choice unless you are willing to discard wither box or driver. usually i cant discard driver so i rebuild box. in your case it might be cheaper to find driver that will work in the small box you got.

2. if you want to build a new box why not build a really nice box. the more i hear TLs the more i like them. I have built proted, sealed and aperiodic boxes. sealed is easy with your driver it will work fine expect the F3 will be kinda high.

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Old 14th April 2003, 05:57 AM   #16
jleaman is offline jleaman  Belgium
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well i dont like the box i have now because it is a car subwoofer box with a amplifier in the end. I need a ported box for this driver so that is what im going to do. if i like it ill buy more 8" subs like these ones. if i dont ill build some thing better with better drivers. : O )
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Old 14th April 2003, 07:04 PM   #17
navin is offline navin  India
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NEED a ported box? why?
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Old 14th April 2003, 07:06 PM   #18
jleaman is offline jleaman  Belgium
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Because i like ported boxes better. There smoother and i like the deep bass that i can get from a ported box.
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Old 14th April 2003, 07:10 PM   #19
navin is offline navin  India
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ever tried TL? i prefer them to ported.
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Old 14th April 2003, 07:12 PM   #20
jleaman is offline jleaman  Belgium
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nope i havent. Got a box layout or plan.
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