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Post by backousis on Apr 3, 2011 8:57:05 GMT -7
i was thinking of changing my drivers
4xjjbl gt5-15 with jbl gto 1514
the reason i want to do that is i want tighter bass
more for music and less home theater oriented?
gto 1514 has lower qts 0.49vs0.67
higher bl 17.13 vs 16.53
and less cone mass 243 vs 317 gramms.
do you guys thing it will help me get closer to my target?
george.
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Post by ThomasW on Apr 3, 2011 11:20:12 GMT -7
I would wait until such time as you have money to buy drivers that don't have polypropylene cones and do have more Xmax.
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Post by backousis on Apr 3, 2011 12:03:49 GMT -7
and what kind of cones should they have? xmax is more than enough for me. the y shake the building without sweat.  |
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Post by ThomasW on Apr 3, 2011 12:44:22 GMT -7
Looking at the drivers from Fi or AE the cones are pulp reinforced with a layer of epoxy applied Kevlar. These are extremely stiff and offer more pistonic cone motion than poly which by nature is not stiff at all. That's why the JBL drivers have those massive ribs in the cone. To try and stiffen the poly
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Post by backousis on Apr 3, 2011 13:09:36 GMT -7
this AE spb15 looks interesting.
i guess they will be around 400$ the 4 like the previous ib15.
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Post by ThomasW on Apr 3, 2011 18:57:03 GMT -7
My bad AE isn't using reinforced cones. Fi, DIY Cable, and Mach 5 use them
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Post by chrisbee on Apr 3, 2011 23:11:44 GMT -7
Don't quote me, but I just read on their own forum that AE have made their very last IB15s.
AE's IB15 coated paper cones had a flared cone form. Their earlier plastic cones were straight sided.
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Post by FOH on Apr 4, 2011 5:26:52 GMT -7
Don't quote me, but I just read on their own forum that AE have made their very last IB15s. That's bad news if it comes to be. The motor technology, and driver quality AE puts out sure seem outstanding by all accounts. I had always hoped there was a significant enough market for John to make an all out assault IB driver,..ie higher a displacement product based on their excellent motors and a larger cone than their 15". |
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Post by ThomasW on Apr 4, 2011 6:11:50 GMT -7
I think JohnJ was having problems maintaining the low price point for the IB15"s.
Although he's marketing them for car audio use, there's no reason his new SPB 15's couldn't be used for home IB subs.
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Post by FOH on Apr 4, 2011 7:01:55 GMT -7
Looking at the drivers from Fi or AE the cones are pulp reinforced with a layer of epoxy applied Kevlar. These are extremely stiff and offer more pistonic cone motion than poly which by nature is not stiff at all. Although this is my first real excursion into IB subs, I've seen and handled a lot of drivers over time. It's funny how human nature pre-disposes one to prejudices, and certain perceptions that become formed without just cause. And even knowing these influences exist, and being mindful not to allow them to influence your opinion, it still happens. Well, a perfect example of what I'm attempting to convey is my preconceived feelings about the Fi products, and specifically the Fi IB3-18. For some reason, prior to getting my hands on them, I viewed the drivers as cheap, low quality drivers. This was despite nearly universal approval from the DIY community. My opinions were way, way off. I was pleasantly surprised to receive them and upon inspection, I discovered they have a very nice build quality to them. And to take the comments above a step further, the pulp, epoxied Kevlar cones are phenomenally stiff. I haven't read any negative reports about the driver's abilities either. For the price, the offer a great value. Every sub-woofer driver in the marketplace consists of a set of compromises, even "cost no object" designs have areas of compromise (ie., sensitivity etc). Well I hope the new Blueprint IB3-18 driver continues where they left off, because the set of compromises that they chose, seemingly possesses all the right elements for high value/strong performance. I do, however have a complaint. The shipping box and foam retainers etc., are so marginal that I'm happy to have received them un damaged. I'm sure they weigh the cost of a bullet proof container, vs. a lesser approach, and likely this is one of the compromises above,...but damn, it does seems risky. I'll include pics in my build thread of the packing. All that said, they arrived unharmed  Thanks |
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Post by backousis on Apr 5, 2011 7:48:16 GMT -7
i wonder how the different cone materials sound.
and what about qts?
i read ay the faq that the lower qts have tighter bass but
nobody seems to care.
ficar considered the best have high qts.
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Post by ThomasW on Apr 5, 2011 8:40:15 GMT -7
i wonder how the different cone materials sound. Sound differences are minimal given the passband IF the cone is sufficiently stiff It's the standard trade off situation. Currently there are no low buck (stiff coned) IB drivers with a low Qts for sale. So a low buck well made driver with a higher Qts is the best option |
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