![]() R/F stereos have an externally amplified audio system which is the grey box under the rear deck. Non R/F audio is a 7spkr setup with a RADIO INTERNALLY AMPLIFIED SYSTEM the wiring is slightly different because of this. Oddly this question is asked good day to you all readers. The converter is simply a voltage divider network that functions in the same manner using series-parallel resistance. I would advise against spending alot on a speaker-to-line level converter, as a two pole stereo 5k Ohms potentiometer serves the same purpose. Too much marketing, not enough engineering. I would not spend too much, as any mobile audio amplifier I've seen has fallen short of a good home audio one in several regards. Many control units and amplifiers feature the same circuitry, with more powerful amplifiers making use of a greater number of output Mosfets and higher gain structuring. Like most mobile audio manufacturers, the products are made in the same factory as many others. 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. 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. ![]()
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