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Car Forum / Driving, Maintenance, Tuning / Car Audio / April 2004Pioneer Premier internal amp
Frequency response 50 - 15000 Hz. Is this typical of most hu amps? > Frequency response 50 - 15000 Hz. Is this typical of most hu amps? A freq resp. is meaningless without a level associated with it. You'll commonly see +/- 1dB or +/- 3 dB after it. Specs only list 5% THD in association with the low and top end frequency pass through. > > Frequency response 50 - 15000 Hz. Is this typical of most hu amps? > > A freq resp. is meaningless without a level associated with it. You'll > commonly see +/- 1dB or +/- 3 dB after it. > Specs only list 5% THD in association with the low and top end frequency > pass through. Not sure exactly what's meant by that. THD changes considerably based on output level as well, so you can't really tag 5% THD to a certain bandwidth without knowing the output level. And then the question becomes...what is the source of the harmonic distortion? And what is its frequency content? In other words, ignore THD ratings, because they not very relevant. Anyway, here's a link to the freq response of a Pioneer DEHP9300: http://www.carsound.com/reviews/hd_units/DEH-P9300chts.html This one has essentially a flat freq resp across the entire bandwidth. The slight -1dB dips that you see on each end are inaudible to to their small magnitude and relatively small bandwidth. So if I understand this correctly, the graph shows that the frequency response of the internal amp is wider than what is stated in the manual(DHE-P930). Based on the manual I was surmising that the internal amp did not process frequencies below 50 and above 15000 Hz. Thanks. > > Specs only list 5% THD in association with the low and top end frequency > > pass through. [quoted text clipped - 12 lines] > slight -1dB dips that you see on each end are inaudible to to their small > magnitude and relatively small bandwidth. > So if I understand this correctly, the graph shows that the frequency > response of the internal amp is wider than what is stated in the > manual(DHE-P930). Based on the manual I was surmising that the internal amp > did not process frequencies below 50 and above 15000 Hz. Thanks. I don't know if it's the same model as yours, but if it's made in the same year the design is quite possibly the same. In any case, there's never a steep cutoff. As you can see from the graph, the frequency response of this unit would be 20Hz-20kHz @ +/-1 dB. It would probably also be something like 10-40kHz @ +/- 3dB if you extended the graph out. The problem is that manufacturers will sometimes just put "20-20kHz" or "10-50kHz" or whatever in the specifications, leaving you without an idea what they're talking about because they're not providing the dB threshold. Anyway, I don't know why your unit says 50-15kHz. The Pioneer manual for the DEH- 9300 states the same; 50- 15000 Hz. > > So if I understand this correctly, the graph shows that the frequency > > response of the internal amp is wider than what is stated in the [quoted text clipped - 12 lines] > > Anyway, I don't know why your unit says 50-15kHz. The online Pioneer manual for the DEH- 9300 states the same specs 50- 15000 Hz > > So if I understand this correctly, the graph shows that the frequency > > response of the internal amp is wider than what is stated in the [quoted text clipped - 12 lines] > > Anyway, I don't know why your unit says 50-15kHz. The only thing I could find online for the DEH-P930 listed a CD frequency response of 20-22,000 Hz. Could 50-15,000 be the frequency response for the FM radio portion of the receiver? I did find another Pioneer receiver that listed a frequency response of 50-15,000 Hz, but that was listed as the RMS Power Bandwidth, and described as the frequency range used in determining the RMS power of the built-in amplifier. This same receiver had a separate frequency response of 5-20,000 Hz for the CD portion of the receiver. Scott Gardner >The online Pioneer manual for the DEH- 9300 states the same specs 50- 15000 >Hz [quoted text clipped - 17 lines] >> >> Anyway, I don't know why your unit says 50-15kHz. You are right about CD player. The frequency response for the fm receiver is listed as 30- 15000 Hz. I can not post a link of the url to the group because the Pioneer website requires registration and a password to download the pdf formatted manuals. Scott, are you saying that if Pioneer were to use a broader bandwidth, they would need to show fewer rms watts? . > The only thing I could find online for the DEH-P930 listed a CD > frequency response of 20-22,000 Hz. Could 50-15,000 be the frequency [quoted text clipped - 7 lines] > > Scott Gardner The frequency range that the manufacturer chooses for testing does have an effect on the power numbers as well as the distortion numbers. That's why some of the cheapie manufacturers use very small ranges for their testing, or sometimes even no range at all, just a single frequency such as 1 kHz. But as others have said in this thread, a frequency response specification is pretty much useless without listing attenuation limits to go along with it. An amp with a frequency response of 50-15,000 Hz, plus or minus 0.5 dB might have a better overall response than another amp with a range of 20-20000 hZ, plus or minus 3 dB. Scott Gardner >You are right about CD player. The frequency response for the fm receiver is >listed as 30- 15000 Hz. I can not post a link of the url to the group [quoted text clipped - 13 lines] >> >> Scott Gardner that sounds like the fr of the fm tuner > > So if I understand this correctly, the graph shows that the frequency > > response of the internal amp is wider than what is stated in the [quoted text clipped - 12 lines] > > Anyway, I don't know why your unit says 50-15kHz. |
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