SMAART interpretation please |
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jamie-ashton-solo
Young Croc Joined: 26 January 2009 Location: staffordshire Status: Offline Points: 728 |
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the driver is fed with 1 amp to the 2 and 1 so the 1 can't be flipped with dsp, they could flip both with dsp however this then puts a big hole at 450hz making the 2" out. Looking at the picture of the other guys vqnets being flipped at the 1" suggests that must be what they have decided to do. There is no crossover in the cabs so they are just letting the 2 and 1 run to there natural roll off points.
The only thing I'm wondering now is without the flip, that phase trace sits pretty well around 0° but has the dip in response, but with it I get an extra phase line starting from 7k up. So in a perfect world, would the trace be a horizontal line like first screenshot? If so that suggests to Me that delaying the 1" would give much better results than flipping polarity?
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Yes, there is usually a passive xover or active DSP on those drivers that uses a filter set to introduce delay. It suggests yours is missing a component, to be honest.
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jamie-ashton-solo
Young Croc Joined: 26 January 2009 Location: staffordshire Status: Offline Points: 728 |
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Yes that has crossed my mind.
I'll post some pictures for you to look at. See what you think. The first two are of my board and driver. The 3rd is the other guys. It's the same board, same driver, only difference is the 1" is inverted at the driver on his. |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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If blue is -,brown is + than both are wired with voltage drop from red terminal to black terminal on driver. With only passive cap on one section.
Edited by gen0me - 24 January 2019 at 8:44pm |
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jamie-ashton-solo
Young Croc Joined: 26 January 2009 Location: staffordshire Status: Offline Points: 728 |
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No this is the layout I bought them with from the previous owner.
This way creates a dip at 7k. I have since inverted the 1" to remove the dip which smoothes the response and has a better sound. Picture 3 shows somebody else's vqs also with the 1" inverted.
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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Hmm, that still does not seem right to me. Flipping the polaroty does fix the responce, but the phase is wrong.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Edited by gen0me - 24 January 2019 at 9:10pm |
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jamie-ashton-solo
Young Croc Joined: 26 January 2009 Location: staffordshire Status: Offline Points: 728 |
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I'm really lost with all this now. That's what I thought. The phase is right but that gives the dip and lack of hf presence.
Or I flip the 1" and the response is flat but the phase is wrong. I tried every combination last night and measured all and the best phase and frequency response I got was with the 12s and 2" flipped. I don't know what to do now with it all.
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bee
Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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can you measure each driver separately and show all data on same graph, un wire each driver take readings and post up using xover board. something funky defo going on.
to add... has any of the drivers ever been reconed. Edited by bee - 24 January 2019 at 10:36pm |
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https://www.elements-audio.com
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Photo voice coils to show wiring and connections or draw schematic.
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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It's tiny, but here's the BMS factory provided crossover board:
And here's the same driver, and similar horn, using a crossover, wired as normal polarity https://blog-001.west.edge.storage-yahoo.jp/res/blog-fe-e6/bamboo_bun6/folder/975584/51/25364651/img_0 I'm very surprised if that's all they've used in that box, purely passive and natural rolloff. Mostly because the VHF diaphragms on these drivers can pop easily at full tilt, even with the passive the factory provide. Edited by toastyghost - 24 January 2019 at 10:54pm |
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jamie-ashton-solo
Young Croc Joined: 26 January 2009 Location: staffordshire Status: Offline Points: 728 |
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Yes will do that. Will be Wednesday again now though.
The seller didn't mention any reconing but can't be sure of that.
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