I was planning on buying the Kenwood KDC-X491
and this is what it says about it:
The unit's Mos-Fet amplifier is rated at 22 watts x 4 channel RMS and 50 watts x 4 channel peak.
3-Sets of 4V Preamp Outputs: The KDC-X491 features front, rear and subwoofer 4V preamp outputs. The Subwoofer preamp output can be turned On or Off and adjusted independently. The front and rear speaker preamp outputs are balance and fade adjustable. The subwoofer preamp output is non-fading. The front and rear preamp outputs are fixed to the chassis, while the subwoofer output is on 7.5" pigtail lead.
Front and Rear High-Pass Filter: The KDC-X491 features an independent High-Pass Crossover for the front and rear channels. You can adjust the high-pass crossover from through, 40, 60, 80, 100, 120, 150, or 180, 220Hz. The "Through" selection is a full-range setting. This feature is very helpful when you have smaller-type speakers in the front and larger-type speakers installed in the rear of the vehicle.
Low-Pass Filter: The receiver features a built-in Low Pass Filter control for the preamp-output when the Subwoofer Output is "on". You can select from 50, 60, 80, 100,120Hz or Through. The "Through" setting allows your external amplifier's crossover network to do all the filtering for your subwoofer.
Subwoofer Level: Once you have switched the Subwoofer Output to "on" you can independently control the subwoofer preamp output level from the CD receiver. You select levels between -15 to +15.
Speaker Settings: The Speaker Setting function tailors the System Q Sound Control settings according to the type of speakers in your vehicle. You may select a Speaker Setting of "SP Off" (flat), "SP OEM" (for OEM factory speaker systems), "SP 6x9/6" (for systems with 6" and 6"x9" speakers), or "SP 5/4" (for systems with 4" and 5" speakers).
Note: The Speaker Setting affects the bass, midrange, and treble values of the System Q presets. The speaker setting should be selected first.
System Q Sound Control: Six EQ curves are preset into memory, allowing you to recall the best preset EQ curve for different types of music. Each preset has its own level settings for bass (100Hz), midrange (1kHz), and treble (10kHz). The 6 preset curves with their respective bass, mid, and treble levels are as follows:
* Rock: Bass +6, Mid +1, Treble +2
* Pops: Bass +3, Mid +2, Treble +6
* Easy: Bass +6, Mid 0, Treble -2
* Top 40: Bass +3, Mid +1, Treble +8
* Jazz: Bass +5, Mid +2, Treble +2
* Natural (Flat): Bass 0, Mid 0, Treble 0
Note: The above values reflect the System Q settings when the Speaker Setting function is turned off. When the Speaker Settings are selected, the System Q level settings are different.
Bass/Treble/Mid Control: The KDC-X491 features independent Bass, Treble and Midrange control. You can adjust each one from -8 to +8db.
Detail Audio Control: The Detail Audio Control allows you to adjust the following settings for the Bass, Treble and Mid levels.
* Bass Level:
o Frequency: 40/50/60/70/80/100/120/150 Hz
o Q-Factor: 1.00/1.25/1.50/2.00
o Bass Extend: On/Off (when this feature is set to "On", the low frequency response is extended by 20%)
* Mid Level:
o Frequency: 0.5/1.0/1.5/2.0 kHz
o Q-Factor: 1.0/2.0
* Treble Level:
o Frequency: 1.0/12.5/15.0/17.5 kHz
Loudness: The Loudness feature compensates for low and high tones during low volume. You can turn this feature either on or off. Only the low tone is compensated for when the tuner is selected as a source.
