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Question Section – Audio Advice

5 July 2011 5 Comments

Message: I need your expert advice, I am not a expert on installing sound, but I know how to help myself.
I recently installed a small system into my Nissan 1400 bakkie, but I am not that happy with it.
Equipment I have in;
Sony Xplod CD Player
2 x 6×9’s in the doors
2 x Starsound SSWD-4000d4 dvc subs
1 x SSA-S1D-6800D amplifier (installed 1 week ago)
Gauge 4 wiring kit
1 x Standard battery


I’am only getting 135.8 db with the 2 subs and I ran them on a 6000w XTC amp. I now installed a 6800w Monoblock 1 channel amp, how do I connect the subs to get the best out of them for sound shows, the guys with their Corsas and V dubs laugh at me whenever I enter for a sound competition. Do you have any suggestions, ideas to make it play better, louder, more bass,  maybe going for 140db+ ??

AutoModified Reply: Hi Ben, best is to go for a fibreglass sub enclosure, the woofers must be from the same brand- Power Handling (watts), Frequency Response (Hz) ,Sensitivity (Efficiency)and Impedance(Ohm) must be the same. The amp must also have enough power (RMS) to be able to handle the power of the woofers(RMS). The box must also be built to spec-Recommended Enclosure Size! Hope it all make sense!

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  • Hennie said:

    First of all witch subs do you have daul 4 ohm or dual 2 ohm and how do you have them connected. Do a upgrade on you cable to 0 gauge cable . Connect you subs + of the first coil to the + on the second coil and the same on the – and then join you 2 + cables from the 2 subs together and the – together so that you only have 2 wires going to you amp 1 + and 1 – ( if you have the dual 4 ohm subs your amp will see 1 ohm and will perform on its best )


  • Ben said:

    Hi Hennie, yes it’s the dual 4 ohm. I have a wrong connection, i will rewire it tonight at home. I tweaked it a bit an it sounds better, but will try your way for sure and will let you know what my Db reading is then. Oh, i removed the cap, and i have the 2 yellow cone starsound subs in..

    Thanx for your help
    Play it loud and keep it loud



  • Ash said:

    Hi Ben, for subwoofer wiring diagrams, check out:


    They pretty much cover all wiring options & combinations.

    I agree with Hennie, check your sub connections.

    The enclosure is extremely important and must be build to spec. Port size also plays a big role (if you are running a port) & must be tuned accordingly. I would recommend re-inforcing your enclosure with fibreglass, to eliminate any flex.

    Battery power is very important, you will struggle to achieve good DB figures if your initial power supply is unable to provide the system with enough power. You might want to look at an alternator upgrade, along with a battery upgrade. We have had good results from fitting a larger battery and upgrading the alternator. If you decide to upgrade your power cable, to the amp, remember that you also should do the same with your ground cable.

    Hope this helps.


  • Joe Klein (author) said:

    thanks for that, Ben and Ash.


  • Ben said:

    Hi Guys me again

    Does anyone have specs for a box to run 2 x SSWD-4000D4 subs in a Nissan 1400?

    Oh, Ash and Hennie, I gone up to 138.8 db bassboxing lol just a few tweaks done..

    Take care guys


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