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General Car Audio
Very "Bright" Setup, sad face
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<blockquote data-quote="keep_hope_alive" data-source="post: 7907448" data-attributes="member: 576029"><p>what an annoying issue.</p><p></p><p>a couple things to verify.</p><p></p><p>1. does the 80PRS have different settings for each input - i.e. level/eq/sound shaping?</p><p></p><p>2. if you listen to the same song on USB HDD vs USB Thumbdrive vs CD (i.e. just burn that same mp3 to a CD in mp3) and it sounds different, then I agree you have a USB issue.</p><p></p><p>3. Note that a large HDD is a power hog, and you need adequate power (current) to deal with that. Voltage fluctuations in the supply voltage will compound the issue. SSD is recommended for automobile use - they have lower power requirements and are faster... but more expensive. If the thumbdrive sounds different than the HDD, i would suspect the HDD is underpowered.</p><p></p><p>Auto EQ is only as good as the mic placement. I recommend you move the mic around during the EQ process (like a figure-8 pattern). Keeping it stationary will result in the program trying to compensate for standing waves and modes - peaks and nulls that are specific to that location. some systems are more sensitive to this than others, but all will suffer some form of it. You can see this effect with a narrow band RTA (1/24th octave can show it also).</p><p></p><p>Placement and aiming are key. Each song will peak and sustain different notes. Each note has a set of frequencies associated with it, and each frequency has a wavelength. Speaker placement and aiming affect what frequencies suffer constructive and destructive interference. This gets back to the Auto EQ as well.</p><p></p><p>Keep EQ flat until you resolve the issues overall. Defeat it totally. Systems that rely heavily on EQ are usually poorly implemented. Proper speaker installation, aiming, and placement can alleviate a lot of the symptoms that cause people to reach for an EQ.</p><p></p><p>Pioneer's internal crossovers are fairly poor. It's hard to know exactly what they do to phase, but note that 12dB/oct and 18dB/oct give a 180deg phase shift - like reversing polarity on the speaker. I've found it's best to just use the same slope for everything - and you suffer the least phase issues. Amplifier crossovers are analog and more predictable. Fall back on them when possible. I found on my Alpine that I needed to overlap HU crossover points (after I did an RTA on the outputs). They drop off faster than expected.</p><p></p><p>In the '05 Scion tC build, the Audison crossovers are far superior to the Pioneer 980bt crossovers - night and day difference.</p><p></p><p>tweeter placement can cause harshess at some frequencies and not others - it's phase interference due to reflections combining with direct. it will vary song to song.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7907448, member: 576029"] what an annoying issue. a couple things to verify. 1. does the 80PRS have different settings for each input - i.e. level/eq/sound shaping? 2. if you listen to the same song on USB HDD vs USB Thumbdrive vs CD (i.e. just burn that same mp3 to a CD in mp3) and it sounds different, then I agree you have a USB issue. 3. Note that a large HDD is a power hog, and you need adequate power (current) to deal with that. Voltage fluctuations in the supply voltage will compound the issue. SSD is recommended for automobile use - they have lower power requirements and are faster... but more expensive. If the thumbdrive sounds different than the HDD, i would suspect the HDD is underpowered. Auto EQ is only as good as the mic placement. I recommend you move the mic around during the EQ process (like a figure-8 pattern). Keeping it stationary will result in the program trying to compensate for standing waves and modes - peaks and nulls that are specific to that location. some systems are more sensitive to this than others, but all will suffer some form of it. You can see this effect with a narrow band RTA (1/24th octave can show it also). Placement and aiming are key. Each song will peak and sustain different notes. Each note has a set of frequencies associated with it, and each frequency has a wavelength. Speaker placement and aiming affect what frequencies suffer constructive and destructive interference. This gets back to the Auto EQ as well. Keep EQ flat until you resolve the issues overall. Defeat it totally. Systems that rely heavily on EQ are usually poorly implemented. Proper speaker installation, aiming, and placement can alleviate a lot of the symptoms that cause people to reach for an EQ. Pioneer's internal crossovers are fairly poor. It's hard to know exactly what they do to phase, but note that 12dB/oct and 18dB/oct give a 180deg phase shift - like reversing polarity on the speaker. I've found it's best to just use the same slope for everything - and you suffer the least phase issues. Amplifier crossovers are analog and more predictable. Fall back on them when possible. I found on my Alpine that I needed to overlap HU crossover points (after I did an RTA on the outputs). They drop off faster than expected. In the '05 Scion tC build, the Audison crossovers are far superior to the Pioneer 980bt crossovers - night and day difference. tweeter placement can cause harshess at some frequencies and not others - it's phase interference due to reflections combining with direct. it will vary song to song. [/QUOTE]
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