Home » Audio » Speaker » DCA 5.5 T/S Specifications
Food For Thought For Builders [message #21877 is a reply to message #21876] Wed, 17 October 2007 19:33 Go to previous messageGo to next message
DrD is currently offline  DrD
Messages: 19
Registered: May 2009
Chancellor
It needs to be pointed out that although the PAWO and Mini Onken work well with the 5.5, these alignments were not intended for this driver, making it a sub optimal load. I had Scott Lindgren, who is a wiz at Martin J King's MathCAD tables do his own calc for me, for a BIB, which concurred with my own calcs. With the bigger cabinet, and long 138 inch line to keep the driver in check, I would bet a paycheck that as good as the PAWOs and Onkens sound, the BIB will be streets ahead in all ways, including SPL, and fantastic bass reach, we both calcd F0/34Hz, F5/30Hz, with ~92db in the presence region, and all this without room gain. Imagine what a bipole 5.5 BIB would be like...

If Someone Knows How To Post Attachments... [message #21878 is a reply to message #21877] Wed, 17 October 2007 19:37 Go to previous messageGo to next message
DrD is currently offline  DrD
Messages: 19
Registered: May 2009
Chancellor
they can email me at dsmason80@gmail.com and I will forward the computer FRP for a 5.5 BIB.

Re: If Someone Knows How To Post Attachments... [message #21879 is a reply to message #21878] Wed, 17 October 2007 22:01 Go to previous messageGo to next message
Eric Gonzales is currently offline  Eric Gonzales
Messages: 32
Registered: May 2009
Baron
i can post it for you. i sent you my contact info

new amplifier [message #21880 is a reply to message #21879] Wed, 17 October 2007 22:03 Go to previous messageGo to next message
Eric Gonzales is currently offline  Eric Gonzales
Messages: 32
Registered: May 2009
Baron
i need a little help with amps for the DCA5.5M. I'm beginning to really like Eddie Vaughn's Carina EL84 SET amplifier for 1.3w of triode cream. That should be enough for a townhouse, right ? If not, Eddie can add up to a total of 3 tubes for around 3.5w triode.

Addendum: new amplifier [message #21881 is a reply to message #21880] Wed, 17 October 2007 22:06 Go to previous messageGo to next message
Eric Gonzales is currently offline  Eric Gonzales
Messages: 32
Registered: May 2009
Baron
3.5w but with less oomph since tubes will be compounded

From DrD [message #21882 is a reply to message #21881] Wed, 17 October 2007 22:39 Go to previous messageGo to next message
Eric Gonzales is currently offline  Eric Gonzales
Messages: 32
Registered: May 2009
Baron
By the usual T/S pipe-horn calculations Greg Monfort came up with, it'd need a bloody big box due to that high 0.657Qt (see specs sheet 003 you sent). Footprint would be ~150in^2, plus build materials, which is a bit daft for a small driver.

However, due to Vas being low, an under-sized box with a CSA of 65in^2 can be used, because although the LF drops off compared to the ~'ideal', in the LF it's still at least 10db over the driver's nominal IB response, & ~flat to about 34Hz & that's before room-gain kicks in. See the example FR I've attached for a 64in tall box with driver 27.75in down & 65in^2 terminus CSA. The low Vas also means the box air-mass should still be sufficient to help keep the the driver in check. Basically, it's not going to be too critical. Minimum CSA 65in^2, anything you can add to that up to about 145in^2 is a bonus. The 64in tall box BTW looks favourite to me, so it's tuned fractionally below Fs.



FRP [message #21883 is a reply to message #21882] Wed, 17 October 2007 22:40 Go to previous messageGo to next message
Eric Gonzales is currently offline  Eric Gonzales
Messages: 32
Registered: May 2009
Baron

http://homepage.mac.com/vizion8/undersized.gif

Re: FRP [message #21884 is a reply to message #21883] Wed, 17 October 2007 22:54 Go to previous messageGo to next message
DrD is currently offline  DrD
Messages: 19
Registered: May 2009
Chancellor
Note that the program calcs the 5.5 ~95db SPL in half space, and this is without added room gain, which with the bigger BIBs is considerable. Note F7 is 30Hz. Note also how it can be EQ'd from the lower register right through into the treble region, at greater than 90db, more like 95db. Note also that if one subtractively EQ'd to ~90db, F3-30Hz. Interested yet?

Thanks Eric for doing the thang.

Re: new amplifier [message #21885 is a reply to message #21880] Wed, 17 October 2007 22:58 Go to previous messageGo to next message
DrD is currently offline  DrD
Messages: 19
Registered: May 2009
Chancellor
I would bet PP EL84 would be absolutely stunning with the 5.5 in a BIB. i have heard good PP el84 with good Axiom aluminum 6.5, and also Jordans, and could easily live happily ever after with that set up. EL84 is an amazingly musical tube, and gives up NOTHING to DHT, in my opinion.

specs [message #21929 is a reply to message #21867] Tue, 13 November 2007 16:10 Go to previous messageGo to previous message
Eric Gonzales is currently offline  Eric Gonzales
Messages: 32
Registered: May 2009
Baron
Here are some specs I received courtesy of DrD

http://homepage.mac.com/vizion8/DCA5.5M-specs1.jpg
http://homepage.mac.com/vizion8/DCA5.5M-specs2.jpg
http://homepage.mac.com/vizion8/DCA5.5M-specs3.jpg
http://homepage.mac.com/vizion8/DCA5.5M-specs4.jpg


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