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Everything posted by sundownz
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We don't test that kind of power on the bench - as was mentioned I'd do that in my vehicle. We also have a battery bank to back up short period high power testing.
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All newer SA-8s also feature the bolted down spider.
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My Dad came in and installed the 240v panel for us (he was an electrician for 20+ years) -- each supply has it's own breaker. Brandon did all of the wiring on the board for the supplies themselves. Quite a bit of work in the whole deal but will make testing alot easier
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From: Used, B-Stock, Refurbished Amps, and MISC
sundownz replied to BanginGMC's topic in Test 1, 2, 3...
Poor cosmetic quality used amps would likely be repaired under warranty rather than replaced -- it would go to dB-R for the repair as they handle all of our work. -
The NS v.2 is 2000-watts RMS.
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Hmmm... good question I shipped the prototype to Russia so I'll have to mock up a basket on a motor when I get a chance and measure it all.
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I don't see much reason to tune under 35 Hz in vehicle due to transfer function -- but you could tune them down to 20 Hz if you really wanted.
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Initial un-broken in specs on the SPL D2 coil indicate about 25% higher BL^2/RE -- the glue isn't dry so I can't measure it broken in yet... will do so tomorrow and confirm that it is that much higher.
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Good stuff !
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I am a little busy with the items mentioned in this post -- but later I will work on other things.
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I'll have pre-ordering for SA-15 and E8 v.2 opening up shortly for those waiting. Ironing out all the final details on production.
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Bit more on the SPL coil for NS v.2... here is a comparison of spec : Dual-1 "standard" Coil : WW = 71 mm ID = 76.3 mm OD = 83.8 mm DCR = 0.95 per side Inner Gap = 1.15 mm Outer Gap = 1.35 mm Dual-1 "SPL" Coil : WW = 57 mm ID = 75.5 mm OD = 84.5 mm DCR = 0.8 per side Inner Gap = 0.75 mm Outer Gap = 1.0 mm So we have 0.75 mm more coil thickness in the gap and a lower DCR for SPL burp purposes. I'll do spec comparisons once they arrive... sample D1 versions shipped today so I should have them soon.
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Almost forgot... E8 v.2 will be available around year end too : E8 v.2 Prototype - Car Audio Classifieds And yes... that means E8 v.1 can be re-built again as I will have parts.
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Few other things that haven't been directly talked about... just mentioned in passing : 1) Z v.2 woofers have been revised as time has progressed. * Coils are now 4-layer round quad-wound biflair copper coils... more robust than the original aluminum, the copper has a lower expansion ratio which helps in the tight gap, more BL^2/RE (motor force), lower FS, etc. * My testing shows no loss in SPL at lower power and a 0.3 gain above 6kw burps. * Top shorting ring was removed -- but internal ring was upgraded to copper. * WoofersEtc has ordered some of every size and coil configuration so I'll be posting new T/S specs for every size soon. 2) Nightshade v.2 SPL coils will be available soon... not suggested for daily as they tighten the gap but I expect higher motor force from these and the DCR is lower... also slightly shorter WW for lowered mass. Testing to come when they arrive.
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From: Used, B-Stock, Refurbished Amps, and MISC
sundownz replied to BanginGMC's topic in Test 1, 2, 3...
No, those had no boxes or remotes. -
From: Used, B-Stock, Refurbished Amps, and MISC
sundownz replied to BanginGMC's topic in Test 1, 2, 3...
Lots of these selling... list updated. -
Correct. Without resorting to gigantic sized magnets you can get a VERY powerful motor with Neo.
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Check the ground - if that is good and the amp is not shutting off it's fine. Those do run warm / hot - especially when it's hot outside.
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We got bored a few minutes after close and decided we were going to smoke a pair of mechanically damaged SA-8s -- well it turned out to be harder than we suspected to thermal these little guys... even the 2" coil SA-8 was able to out-last the Type-R 12" that we tested - I am pretty satisfied with that. Video comment : "Comes online at 69v/9.5A=655 watts so 325 each... crank it up a bit and land at 81.5v/10.5A=855 watts so ~427 each. All the way down at 3 minutes we are still at 82.6v/9.16A=756 watts... we keep playing nice until 5 full minutes elapsed at right around rated power levels then crank it up all the way to 115v/12.5A=1437 watts or 718 each !!! Then continued to play for ANOTHER 2 minutes or so at this power level before smoking the coil." Not too shabby for subs rated 400 RMS each... especially keeping in mind that at 60 Hz there is very little excursion so coil cooling is nowhere near optimal. On music with higher excursion the coils will cool even better. So remember... SA-8s are MECHANICALLY limited... chances are you will not smell them or hurt the coil, ever. So don't do the "smell test" to see if you have too much power -- watch the level of excursion and listen for mechanical distortion! Pardon the opening remarks *laughs* Brandon didn't let me finish introducing the video.
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The "back plate" part is 25mm thick -- and is needed for the amount of flux intended for the design. 35mm of the plate is cut out for clearance which leaves a good bit of room so I can use a range of coil lengths. With a 50mm long coil I have 37.5mm of clearance remaining, for example. I didn't want to have a multi-piece assembly so I had it all milled out from a solid chunk of steel... back plate and pole are all one piece.
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Going to do some more work on this as it is then have another one made with more magnet slugs on it.
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I do not know if it will be made so I have not estimated pricing. Nor do I know if the design is even done -- just sharing photos of stuff I'm working on at this point.
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Sample is here -- needs more work before testing is to begin -- but here are some pictures next to an SA-8 : I may have to make the motor a LITTLE smaller too -- it's a huge battle to mount it with speaker wires *laughs*
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Working on an update.
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From: Used, B-Stock, Refurbished Amps, and MISC
sundownz replied to sundownz's topic in Test 1, 2, 3...
It is broken - someone hooked it up backwards.