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Post by John on Feb 15, 2019 19:34:09 GMT
I just been listening to my friend new arrangement He is now using the Dayton UM18 www.daytonaudio.com/index.php/um18-22-18-ultimax-dvc-subwoofer-2-ohms-per-co.html for his bass drivers. This are in Isobarek arrangement , are fully suspended on a metal frame and powered by two Berhinger Inukes I have to be honest I never heard bass quite as good as this in any system. They go down really low, have a massive sense of scale and impact. Yet they are nimble enough to capture acoustic music. Its been a long time since I had that experience of listening to music with new insight. To be honest I am kind of in shock to just how good the system is. They system also sounds better throughout the range. I used to think of balancing bass with the mids and treble as a balancing act I have experienced this my Neos, a bit to much bass and they system sounds muddy. However not so with this new arrangement. We listened to a few tracks The ones I am familiar with included George Duke The Black Messiah, Supertramp School, Gordian Knot Aries and Dream Theater In the Presence of enemies pt2 The impact was like nothing else I heard but everything else just flowed    |
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Post by John on Feb 15, 2019 19:35:25 GMT
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Post by MartinT on Feb 15, 2019 20:17:42 GMT
Big 'uns can certainly move air. Is he using a pair of isobarik configurations, i.e. four drivers?
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Post by jandl100 on Feb 15, 2019 20:44:52 GMT
18 inches, 2kW, 19Hz Bass freaks rejoice  |
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Post by John on Feb 15, 2019 21:33:27 GMT
Yes 4 drivers
They do bass like nothing else I heard
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Post by MartinT on Feb 15, 2019 22:52:59 GMT
They even have car audio suggestions. Putting that driver in a car would not be my idea of fun.
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Post by ChrisB on Feb 15, 2019 23:59:44 GMT
Interesting.
Having said that, someone needs to come up with a better label than Isobaric for this configuration. As far as I understand, two drivers facing each other, does not an isobaric system make. You'd need an infinite baffle enclosure for that. This is as far from an infinite baffle as it is possible to get!
By the way, it's not a Linn thing at all. All Linn did was swap the letter 'C' for a 'K'. The configuration was first described by Olson in the 1950s, who worked for RCA.
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Post by John on Feb 16, 2019 10:03:40 GMT
It a good question Chris no idea what to call it.
Yes these are sometimes used in cars in America
Most people would say this cannot work but hearing is believing
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Post by DaveC on Feb 16, 2019 13:41:37 GMT
Celestion did this some time ago ? Are these driven in our out of phase to each other ?
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Post by ChrisB on Feb 16, 2019 14:21:08 GMT
Yes, the SL6000 system.
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Post by ChrisB on Feb 16, 2019 14:24:38 GMT
They were in phase, I think, so a bi-pole.
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Post by DaveC on Feb 16, 2019 14:40:22 GMT
They were in phase, I think, so a bi-pole. Was that physical or electrical phase ? So a positive signal drives both inwards, or one in and the other out ? Never could get my head around that ? |
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Post by ChrisB on Feb 16, 2019 14:55:16 GMT
Aaaah, I have just Gurgled it.
Colloms' Stereophile review of it says they were in the same acoustic phase, so that would mean physical phase & therefore a dipole, wouldn't it?
Speakers like my Mirages are in electrical phase back & front, so therefore a bipole.
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Post by ChrisB on Feb 16, 2019 14:55:53 GMT
No idea how John's are wired though - I just can't remember.
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Post by MartinT on Feb 16, 2019 15:21:28 GMT
I think John's are in phase (allowing for one cone reversed) so the air gap in between is constant? This is isobaric/k.
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Post by ChrisB on Feb 16, 2019 15:22:15 GMT
Not without a box, it ain't!
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Post by John on Feb 16, 2019 15:56:28 GMT
On mine it true Isobarek as a frame between the two drivers The other has about a 10cm gap but this has no affect on sound quality
In some ways I think the metal frame is a lot better approach as becomes a more modular design and you can suspend the bass drivers
Cables are swapped around on one driver
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simon
Rank: Duo
Posts: 71 
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Post by simon on Feb 16, 2019 16:31:57 GMT
On mine it true Isobarek as a frame between the two drivers The other has about a 10cm gap but this has no affect on sound quality In some ways I think the metal frame is a lot better approach as becomes a more modular design and you can suspend the bass drivers Cables are swapped around on one driver John do you have 2 selenium drivers facing each other in your speakers? My father's OB's are using Banstanis drivers with a single Selenium bass driver each side. Based on one of Vic's previous designs. They sound great, but are a little bass light IMO. |
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Post by John on Feb 16, 2019 16:57:57 GMT
Yes they face each other so back is showing both ends
Having two bass drivers gives a lot better bass than just one I do not know anyone who would say my system is bass light so think this type of configuration makes a big difference.
IMO the PRV with the bass drivers (no matter if it is the Dayton's or Seleniums facing each other) really is where the magic starts to happen
The UM18 is a lot better than the Seleniums
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Post by MartinT on Feb 16, 2019 18:31:00 GMT
Not without a box, it ain't! I stand corrected, then. I thought isobaric was having a constant air gap, not being enclosed necessarily. |
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