Impedance of Alpine Hu's
#11
Originally posted by Lethal:
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
#12
If I remember correctly anything less than 100 ohms is considered good. 10kohms is quite high.
My old Alpine 7894 was rated at 4V outputs, but I found the output very weak. Apparently some people tested them to be less than 1.7 volts RMS.
My old Alpine 7894 was rated at 4V outputs, but I found the output very weak. Apparently some people tested them to be less than 1.7 volts RMS.
#13
Originally posted by Lethal:
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
#14
Remember V=IR, so at a constant voltage (4 volts), the higher the resistance, the less current. This higher impedence makes the preouts more impervious to voltage fluctuation due to temperature. inductance, co-axial capacitance, etc.
The current will be much weaker though, but this will not make a differencein most practical applications.
The current will be much weaker though, but this will not make a differencein most practical applications.
#15
Originally posted by Lethal:
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
#16
Originally posted by PerryB:
</font><blockquote>quote:</font><hr />Originally posted by Lethal:
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
</font><blockquote>quote:</font><hr />Originally posted by Lethal:
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
#17
Originally posted by JeepBeats:
</font><blockquote>quote:</font><hr />Originally posted by PerryB:
</font><blockquote>quote:</font><hr />Originally posted by Lethal:
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
</font><blockquote>quote:</font><hr />Originally posted by PerryB:
</font><blockquote>quote:</font><hr />Originally posted by Lethal:
100 ohm 4volt preouts on the CDA9833. Tom (alpine Rep) said that number (4volts) was closer to 5.5
I notice an audible output difference from my 4volt 100ohm Panasonic DPX95 to my new HU.
I have seen many posts from alpine owners complaining of weak sub pre outs over the past couple of years. One guy tested 2 7897s(I believe I referenced his testing on here). The sub out did 3.5 volts which isn't too far off from 4 volts. That wasn't his issue. The front/rear pre outs clipped very hard at 32 on the volume(so 31 was now max volume before hard clipping). Well, at 31 on the volume, the sub out was at 1.7 volts(the sub out level was maxed, 100hz and 1000hz test tones and tested with an o-scope). Now, if that holds true for other alpines is anybody's guess.
I understand that alpine, ofcourse, wasn't too far if on "max voltage" on that sub out, but if only 40% of that is useable, I think alpine owners would have a legitimate issue with them. I mean, if you have an amp that does 1000 watts, but that is at 40% distortion, that 1000 watt spec doesn't mean a whole lot.
Maybe alpine has solved the issue(if they felt that it was a big enough issue to deal with).
[ May 02, 2004, 12:24 PM: Message edited by: PerryB ]
#18
Did you ever get you system working right?
I am not doubting you, but, imo, if an alpine "4 volt" deck is doing closer to 5.5 volts at 100 ohms, that certainly isn't the kind of spec you should have to get from the rep. Those specs would be VERY good, and I would think Alpine would list them clearly in the manuals, lit, website, etc.
Thats all I was stating. I don't know for a fact and am going by someone elses information albeit a rep.
I really love the features and looks of this HU (CDA9833) but I am starting to pull my hair out as to what my issue is with the speakers shutting down through the IC.
I just checked the Alpine tech centre, the manual for the 9833 states that they are 4 volt at 10,000 ohms.
4V/10K ohms looked morelike 4V/108 ohms at a quick glance. Sorry for any confusion.
Perhaps the Pioneer HU are 100 ohm preouts if I remember hearing correctly.
#19
Originally posted by Lethal:
</font><blockquote>quote:</font><hr />Did you ever get you system working right?
</font><blockquote>quote:</font><hr />Did you ever get you system working right?
I am not doubting you, but, imo, if an alpine "4 volt" deck is doing closer to 5.5 volts at 100 ohms, that certainly isn't the kind of spec you should have to get from the rep. Those specs would be VERY good, and I would think Alpine would list them clearly in the manuals, lit, website, etc.
Thats all I was stating. I don't know for a fact and am going by someone elses information albeit a rep.
I really love the features and looks of this HU (CDA9833) but I am starting to pull my hair out as to what my issue is with the speakers shutting down through the IC.
I just checked the Alpine tech centre, the manual for the 9833 states that they are 4 volt at 10,000 ohms.
4V/10K ohms looked morelike 4V/108 ohms at a quick glance. Sorry for any confusion.
Perhaps the Pioneer HU are 100 ohm preouts if I remember hearing correctly. </font>[/QUOTE]It says they are on their website.. (pioneer = 100 ohms)