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volvo 245 |Digital Designs| 4x18" | 161,07dB @Kick 158,5 @28Hz @headrest, 159,84 @windshield


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Yeah, thanks for advice, i will have the 4SPL back on wednesday so i can test all ports with 145+ sweeps.

Sofar i tought the 57l -port should work best and stested it out...

Result:
12029854_880312788712143_216773517518355

I am so happy and angry at the same time!!!

So close!

1ohm:
97V 33,6A Z=2,89 W=3259
157,0 kickpanel
155,3 windshield
@44Hz
0.25ohm:
68,9V 98,9A Z=0,69 W=6814
159,78 kickpanel
157,90 windshield
@44Hz
I did prot the amp couple of times...
It's gettin hard to control the volume knob at 159+ with new port as the air movement is MASSIVE.
I need to develop a way where i can raise the volume slower, as between 50% and 53% of volume the voltage drop is from 12V to 9V (Oh yes, DD M4a has 9V low voltage protection circuit, and yes the amp did survive.)
What a beast of an amp...

Maybe a 200A+ alternator could help me keep the voltages up, so i can get more output!
Make sure you vote in this month's SOTM!!!

May the best volvo win!
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12034226_881045195305569_546844727934844

Port #1 (No port) 140dB+ sweep from kick

12091326_881045295305559_704531026136095

Port #2 (the 159,15dB -port) peaks at 44Hz 12l in volume.

12087104_881045455305543_388496926942343

Port #3 (the 159,78dB one) peaks at 44Hz (same as #2) but dB's went up due the higher airvolume of the port (57l)

Tho the subs closest to the port gets over excited and almost hits max excursion at 159dB+

with smaller port the furthest subs from the port goes crazy.

I think i need to find perfect port where excursion does not strech to the limits.

12006663_881045578638864_580520512497947

Port #4 (the lowlows 38Hz) (peaks still at 44)

12087934_881045668638855_159709979298336

Port #5 the higtuned (54Hz) peaks at 50Hz.

Then some comparison:

12052588_881045768638845_493434207265230

Port #2 vs #3 (159,15 vs 159,78)
Both are around 44Hz tuned, peaks at 44 both.

The port with the higher volume (57l #3) peaks more at 26Hz and at 44Hz, but does not play high notes as well as the #2 port ( 159,15dB)

I have plenty more pics at: http://www.peranurkka.net (our facebook page).

What i have noticed is that it does not matter where you tone your enclosure if you plan to play it door open or doors open.

At the kickpanel the output is almost the same whatever you do with the ported section.

I think i have some sort of "tuning frequency" at 26Hz ( Maybe sealed section??) as it peaks at 26 and 44 everytime.
Or the 26Hz is somesort of a standing wave that builds up between the back of my wall and the windshield.

I also did some dB Drag -measuring just to test how the box works when sealed up:

12091440_881045418638880_268273534010021

Port #3 ( 159,78dB one, 44Hz 57l)

peaks at 41Hz sealed up.

12030302_881045665305522_270285880251837

Port #5 (54Hz) peaks at 44Hz.

As you can see the low end drops off when i close the doors.

11875433_1628647077407726_39770317_n.jpg

Time to get hands dirty...
I'm going to hook up some 2Volt cells i have had laying around...


I want that 160 so bad, i am willing to burp the shit out from my system, then rebuild it in winter, so i can play the 160 with music on next summer :)

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  • 2 weeks later...

Thanks dB_speakerbox, i got updates, but they are not as happy as i would have liked em to be :/

12010748_881421361934619_801895327705804I Finally got my 14volt system to work.
Amp starts nicely at 15,7-15,8V.

12118676_881422105267878_619702124746257

I made some fixing to the port, lenghten it out and filled the gaps.

Then i tested it out:



It turned out that M4a has a protection circuit at 100A on the speaker side.

I cannot get any more watts out from it even if i raise the voltage to 15,7V.

But at 1 ohm (rise to 2,67) i get 5700w ( +2500W more!!) (43,4A 123,9V) so the +2V did a HUGE different.

lowest voltage i got was a 13,8V (measured from terminals, sith FLUKE min/MAX -setup).

Measurements:
13.10.2015 (outside temperature 10c)
14v system (15,7V float, 13,8V lowest)
0,25ohm:
159,55dB @44 (99,4A, 71,4V W=7107, Z=0,71)
1ohm:
157,30dB @44 (43,4A, 123,9V, W=5749, Z=2,67)

Now i will be making more room for more batteries and probably another M4a.
We will be having snow any day now so this season is over :(

159,78dB was the highest and i cannot get that anymore as the weather is so much colder now.
:cray::cray::cray::cray::cray:
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  • 2 weeks later...

That's a bummer, you were so close!

Still very impressive man, 159 is still freakin loud.

Did you try out all the ports or just a few?

I tested them all at 1ohm (155dB+) and chose the one that worked the best :/

BTW!

We have opened a fanshop, where you can buy apparel that has our logos in it.

1,width=400,height=400,appearanceId=29,v

2,width=400,height=400,appearanceId=54,v

1,width=400,height=400,appearanceId=366,

3,width=400,height=400,appearanceId=1,ve

1,width=400,height=400,appearanceId=1,ve

220+ and more coming every day.

Check em out at:

http://shop.peranurkka.net

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Good point there, but i really want my doors to look more agressive than now.
3xmids 1-2 highs / door is enough.

i am getting these to the back of the car:
http://www.ddaudio.com/products/mobile-audio/voice-optimized/vo-ccx8

so i can get fullrange -speakers to the back also.

May i ask, what is MLV ?

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