First DIY Sub, DVC385, NU3000DSP, Speakon Connectors, couple of questions - AVS Forum
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post #1 of 6 Old 03-29-2013, 11:25 PM - Thread Starter
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Going into my first DIY endeavor, I need some validation as to how to connect this all for two subs.

Neutrik Panel Mount Speakon Jack NL4MPR: http://www.amazon.com/gp/product/B00067JSFK

Dayton Audio DVC385-88 15" DVC Series Subwoofer: http://www.parts-express.com/pe/showdetl.cfm?partnumber=295-190

50ft 12AWG 2-conductor Speakon Type NL4FC: http://www.monoprice.com/products/product.asp?c_id=115&cp_id=11509&cs_id=1150903&p_id=8771&seq=1&format=2

Powered by a Behringer iNuke NU3000DSP.

So, these are the ideas I have going on right now:

- NU3000DSP in biamp mode
- 20 Hz HP filter
- Speakon jacks wired to pins 1+ and 1-
- Each DVC385 wired in parallel for a 4 ohm load to the amp

Any correction, suggestion or advice would be greatly appreciated.

Note: The receiver is an ONKYO 818 with two sub outputs(same as a Y-Adapter) so stereo mode in the iNuke may be an option? Would I lose the ability to tweak each sub separately?

__________

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post #2 of 6 Old 03-30-2013, 06:00 AM
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Here is what was reccomended for my subs.. Use these Speakon connectors with the gaskets to seal it air tight:

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=092-067

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=092-094


You could use your connectors but you will need to see if they have a gasket for them..


For the nu3000 I am running in Dual mono, I guess you could use stereo..we should see what some other more knowledgable users say on this.. I think you should use Dual mono..
I am still learning too.. I just built my first DIY Sub bit only have 1 sub..

The amp is over 800w per channel 4 ohm load so I would set the peak limiter to your Ohms and 575w max..

I will run a model in Winisd and see what we come up with..here is the model I came up with in Win ISD:

Driver CVD385-88
Volume = 161.60L
tuning = 20.42
Vents = Round 4" Vent length 11.34" Flared both ends..

Filter 2nd order Highpass Butterworth 20hz

System power 575W reached xmax.. perhaps lower the wattage a bit or be carefull when testing watching for clipping..

here is the file for WinISD:

https://dl.dropbox.com/u/42004272/Krakhen%20sub.wpr



You specs for the Driver indicate it is an 8 ohm load?? you are going to go 4ohms, I guess it is a dual 4 ohm and the way you are going to wire it makes it a 4ohm ????

You will also need a Wire(s) from the Reciever to the amp like this one:


http://www.ebay.com/itm/221194483316?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649


That is if your Reciever has a RCA jack out and the behringer definetely uses the XLR connector..

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post #3 of 6 Old 03-30-2013, 07:40 AM - Thread Starter
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I believe I saw that recommendation about the connectors and gasket somewhere, must have been in your thread. Will get those if mine don't work.

You are completely right about dual mono. I already have two RCA to XLR cables as the one you suggested so I would just connect each receiver output to each amp input and be done with it.

For my first project, I'm going sealed to keep it simple. I know this may limit my LF output level but at least I'm going for two subs. In the future I may decide for a third or completely redo the design to a ported enclosure. There is a build by ack_bk which I'm practically copying for these.

I will also look into the peak limiter function, any suggestions for a sealed enclosure (outer dimensions 21x18x21).

The woofer is a Dual Voice Coil(DVC) which, if I understand correctly, measures 8 Ohms at each pair of posts but since it has two you can wire them in series or parallel for 16 or 4 Ohms respectively. My main doubts in that respect where about pin out for the jack and the amp mode which you already cleared out for me.

Thank you very much for your advice Nephilim1.

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post #4 of 6 Old 03-30-2013, 08:16 AM
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ok from what i see abd what winisd modeled it is a 88.15L box with a tune of 38.03hz at 650w max..

I will try your measurments for the box..not sure i can unput manual dimensions??

who designed that box do they have the winisd file for it??

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post #5 of 6 Old 03-30-2013, 10:41 PM - Thread Starter
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I calculated about 85 liters or ~3.0 cubic feet. With those measures WINISD gives me:

Transfer Function Magnitude

Transfer Function Magnitude - No HPF

Max SPL

Cone Excursion

Cone Excursion - No HPF

Impedance


I understand tune freq would apply if the sub was vented. I should be reaching 102 DB Max SPL with just one sub at 20 Hz, I guess 105 with the two of them in a 13' x 17' x 8' room

Edit: I used 300W as System Input Power

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post #6 of 6 Old 04-01-2013, 09:01 AM
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If you are going to be watching a lot of movies, I do like the 165L @ 20.5 Hz box model for this. You could go a little smaller like 140L @ 22 Hz since you are having a HPF at 20 Hz. Those are some big boxes though. How big of a room are you looking at?

Also, with the models I've been doing, with that iNuke 3000 you are getting 500W RMS per channel, you are going to get major chuffing with a single 4" port. Or at least sims say you should. 3x 3" ports or 2x 4" ports works better.
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