|12th April 2003, 06:58 AM||#12|
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
|12th April 2003, 03:18 PM||#13|
Join Date: Oct 2002
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].
|12th April 2003, 03:48 PM||#14|
Join Date: Oct 2002
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
plasticised cloth [linen] cone edge
solid compostion paper dust dome
8 inch diameter
225 w rms
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.
|14th April 2003, 05:26 AM||#15|
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.
...still looking for the holy grail.
|14th April 2003, 05:57 AM||#16|
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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