Dual 15" subwoofer, rcf design? |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Problem is that, all 4 are still same type drivers.. which is a bit confusing, as the seller was :D I'll add a video soon :) |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Short videoclip of this sub in action:
Edited by Tonskulus - 02 November 2017 at 7:52pm |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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Are you using any high pass filter?
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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no atm, that particular music I was playing didn't have much content under 40Hz.. but for sure, I can try it with high pass if it makes any difference :) |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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Well, there's your problem right there. That model has an Xmax of 6.5mm, so if you can see that the cones are moving well past that, what did you expect it to sound like? Also, didn't you say earlier that they were tuned to around 50Hz? If so, putting tracks through them with strong 40Hz content and no HPF is asking for sh1t sound quality in the first place, followed by damaged drivers if you persist. To expand a little - the stated power rating of a driver has almost nothing to do with how good it sounds or how well it suits a specific box type and tuning frequency - that's what all the other parameters tell you. You can't assume that just because RCF have tested it without damage at 500W (continuous, implying 1000W program), it'll sound good in this box with this type of musical content at that power level. HTH, David.
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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Yes, but as I said I can drive those 18" rcf's well beyond their xmax limits no problem (mechanical limit is 50mm). Clean and loud! Anyway, it sounds like these 15" drivers are reaching their mechanical excursion limits which makes it sound "flobby" even tho thats not the case, spec sheet says limit is 36mm. As you said, these are indeed not designed much under 40Hz frequencies and that might be a problem. I need to try these w/ highpass filter. Edited by Tonskulus - 03 November 2017 at 2:08pm |
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Tonskulus
Registered User Joined: 15 September 2017 Location: Finland Status: Offline Points: 425 |
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I just loaded this sub with old Cerwinvega 15" drivers and flapping is much much worse! Some 50Watts / driver and things go horribly wrong.
Is it possible that manifold makes cone loading asymmetrical somehow? Something really weird there is.. |
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