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09-20-2009, 07:39 PM | #1 |
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RTA plots of the OEM Hi-fi system
I just got this PC based RTA setup so I decided to test it out on the OEM system just to see what we're working with. I've always thought the Hi-fi system is pretty decent. Its weakness seem to be over-emphasized midrange, high frequency rolloff and lack of adjustibility. The RTA seems to confirm that.
Here is a reading taken with bass and treble set to flat. and here is one with some adjustment made on the bass and treble controls There isn't too much information that can be gathered from these plots partially because the lack of a volume level display on the OEM HU makes it hard to set a reference level. What you have to compare is the differences in peaks in valleys in the plot. Based on my comparison, it appears that the bass control is centered at 100Hz and the treble at 10kHz which is pretty common. The high frequency roll-off is very obvious even with the treble control turned up a bit (I think it was +4 in this reading). Bass is set pretty high (I believe its +8). My conclusion is that with a bit more adjustment capability like the EQ the premium audio system has, I think you could get this system to sound pretty good. The high end would still be rolled-off but you get a decent sounding system out of this. We'll see what an aftermarket system run off the OEM HU can do once I get it installed.
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09-21-2009, 09:53 AM | #4 | |
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09-21-2009, 10:45 AM | #5 |
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Hmm. I'm not sure how I would actually get the preamp signal into my laptop and how accurately the sound card in my laptop will be able to receive that signal. I was thinking about using the o-scope feature of the RTA to try to get a clipping point of the HU output but the lack of a volume level display makes that very difficult.
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09-21-2009, 11:00 AM | #6 | |
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09-21-2009, 01:10 PM | #7 | |
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It is a pink noise track off an IASCA SQ Judging Disc that was used specifically for RTA judging.
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09-21-2009, 01:59 PM | #8 | |
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Just use a wire to mini jack cable from Radio Shack then if your card accepts balanced signals. |
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09-21-2009, 02:12 PM | #9 |
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I'll see if I can come up with something. I'm not sure if the two will be directly comparable since I used an outboard source for the RTA plots I did and the pre-amp plots will be based on a signal generator in the software.
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09-21-2009, 04:51 PM | #10 | |
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I'm using the program TrueRTA and a Behringer ECM8000 microphone with the appropriate mic calibration correction file. The microphone is connected to the laptop via a USB Mic Mate so the soundcard in the laptop is bypassed. The Mic Mate has an XLR input on one side and USB on the other.
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