![]() ![]() While it says Rockford Fosgate on the front, it's actually Clarion. This is done using a variable attenuation control circuit, possibly via terminals 12 to 13, although I haven't taken the time to put an oscilloscope on it. When the preamp volume is increased past setting 13, the subwoofer does not increase as much as much as the main speakers. Finally, the subwoofer power follows a non-linear gain curve. The signal-to-noise ratio is quite poor and it's easy to tell when it has been turned on. Common among mobile audio AM/FM receivers, the radio sound compressed, irritating, and needs alot of tone adjustment to flatten its response, compared to CD. That is common among low cost all in one tone IC chipsets. The problem is that the bass center frequency is too high and can sound muddy. The tone control provides the listener with control over two fixed ranges bass and treble, +/-10dB. The turnover frequency is a bit high and there doesn't appear to be any low frquency equalization to compensate for the sealed subwoofer's inherent roll off, leading to bass that can be weak or boomy. The subwoofer level is non-adjustable, as it is references off the other channel's lines. Look for a head unit with a highpass filter for the main channels, usually around 40Hz or higher, and rely upon a subwoofer for all bass under that range. Bass enhancement causes most of the headroom issues. Modern aftermarket integrated control units have at least 25 Watts per channel, providing over 10dB dynamic headroom over average listening levels in excess of 85dB on common sensitivity speakers. I don't know exactly what your listening needs and expectations are, but I'm confident in writing that a control unit with a decent DAC conversion stage, soft-knee antialiasing fiter or upconversion for CDs, and greater than 320kbps MP3 (even better, FLAC compatibility) and adjustable equalizer points will sound better than the Rockford Fosgate/Clarion premium system. The premium upgrade audio system has several limitations, making a modest aftermarket system comparatively better sounding. However, it may use the other channel's negative lines, and if so, it may be the subwoofer input. Since it does not have any indicated polarity, nor a return conductor, it doesn't appear to be capable of carrying audio waveforms. There is an additional connection between the head unit and power amplifier, labeled terminal 12, and on the amp13, and I have not tested it to uncover its purpose. Those two subwoofer channels appear to be referenced at line level from the four main stereo channels there is no discrete subwoofer preout and pre in labeled anywhere. The head unit has four output channels that connect to the power amplifier, and that power amp adds two subwoofer channels to drive the 10" woofer's dual coils. I find it odd that your Spec-V has the smaller subwoofer package, because my 04 SE-R has the 10" woofer in its own enclosure, factory mounted behind the passenger-side rear seat, along with the amp mounted in the trunk under the speaker deck.Īnyway, the Fosgate head unit serves as a source and preamplier, leaving the speaker driving duties to the power amplifier that is mounted in the trunk. Pics should accompany that install.Ĭlick to expand.Is it possible to add a subwoofer to the stock stereo?Īnd with this you would n ot have to dayhing with the head unit.Hi Andrew, I'm going to assume that the head unit and power amp are the upgrade units from Nissan at the time the car was sold. Please stay tuned for updates as LBC (one of the mods) will be doing this to his car in the near future. If your amp allows it, you may also be able to use the speaker cables for the input (some amplifiers have line-level inputs for this purpose). A line level converter can then be used, as mentioned above, to convert the signal to patch cables. If you have the basic stereo (non-Bose), you will need to tap into the speaker wires for the rear speakers. This can be easily tapped from the turn on lead that already runs to the Bose amp. You will also need to connect a remote turn on lead (the signal that tells the amp to turn on so it is only running when the stereo is on). These can then be plugged into the aftermarket amplifier. ![]() You should then use a line level converter to take the speaker wire signal and convert it to patch cables. With the Bose system, you will need to tap into the speaker wires in the trunk (it is best to do this before the amplifier). Is it possible to add a subwoofer to the stock stereo? ![]()
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