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03-18-2012, 08:05 PM | #45 |
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Hmmm, interesting. I've got the OEM sides/rears in parallel (1 ohm) running off one channel pair on the HD900/5. The fronts (4 ohm) are driven by the HD600/4. With gains set to minimum on "low" (2V) the rears are a few dB louder than the front doors. Theoretically, the max output of the HD900/5 at 1 ohm is 75W and that of the HD600/4 at 4 ohm 150W, so the fronts should be a lot louder, but they are not. I'm not worried about it though since I can raise the gains on the front channels to compensate.
The "low/High" input switch discussion though has got me thinking. I've had a problem with noise on the HD900/5 amp. When I switch from low to high, the noise goes away but of course the output level gets reduced and of I raise the gain to compensate, the noise comes right back. I was thinking, since the MS-8's speaker level outputs are of very good quality, what if I used those instead of the low level RCAs? Any potential downsides to doing that? This may be a good solution since it would kill 2 birds with one stone - getting rid of the engine noise AND utilizing the reportedly superior input option on the HD amps.
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03-19-2012, 05:49 AM | #46 | |
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03-19-2012, 02:48 PM | #47 |
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No, I meant using the MS-8 speaker level outputs as the HD amp hi-level inputs.
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03-19-2012, 03:32 PM | #48 |
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03-19-2012, 06:52 PM | #49 |
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It is my understanding that the input voltage rating on the amp input is in RMS, not max volts. At 18W RMS at 4 ohm it would seem the MS-8 is capable of outputting a maximum of 8.5V RMS. Close enough for me, especially since I am not thinking about subwoofer outputs, rather midrange outputs.
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03-19-2012, 06:58 PM | #50 | |
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Last edited by Technic; 03-19-2012 at 07:06 PM.. |
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03-20-2012, 06:11 AM | #52 | |
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The one HD-600/4 I came over with was NIB from JL. I did switch the amps (HD-600/4s) and I got the same uneven power output with the 2ohms vs 4ohms! |
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03-20-2012, 06:15 AM | #53 | |
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I also have "engine noise" with the HD-600/4 but only when I use unbalanced outputs from the MS-8. |
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03-20-2012, 06:20 AM | #54 |
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03-21-2012, 05:59 AM | #55 | ||
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03-31-2012, 01:55 PM | #56 | |
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600/4 150w almost across the board 900/5 - supposedly LESS power to a 2ohm vs 4ohm load (75 vs 100w)? Both supposedly have RIPS...I doubt it would be implemented differently in the respective amps. Good news is that by bridging two 900/5 channels, I can have a perfectly power matched center |
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03-31-2012, 01:58 PM | #57 | |
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03-31-2012, 01:58 PM | #58 |
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I think it has to be. The 900/5 has a bit of a reputation for underperforming relative to expectation... Not that it doesn't meet spec, I don't know, but it may not exceed spec by as much. To jam 900 watts and 5 channels into the same form factor, SOMETHING had to give...
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03-31-2012, 02:00 PM | #59 | |
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04-02-2012, 07:59 PM | #60 | ||||
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Above 4ohms, the 600/4 will halve the available power...i.e. 75wpc. But since you still have 2x voice coil you get that 3dB back, so you are back to (rears+sides)=fronts. Thus I think you should wire in series (according to the manual this is a supported load). Edit: I can't account for the different behavior of the PDX under this theory. |
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04-02-2012, 08:07 PM | #61 | |
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04-11-2012, 11:47 AM | #63 |
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I'd be interested in the answer to this as well.
My HD600/4 has the same issues as reported above, but I've determined its an input signal issue (present even with the OE HiFi amp). The car is an E82 with HiFi + Technic harness adapter. Taking the front channels from the harness to the HD in conjunction with the low input setting (gains at min), I get noise. Switching to high voltage removes the noise but as mentioned above, it returns when the gains of the amp are turned up. Recently I ran the front channels from the Technic harness into a Mosconi 6to8 DSP. This processor has low/high input settings as well. Interestingly, I ended up using a high voltage input configuration to the 6to8 and retained the low voltage setting at the input of the HD. Other combinations resulted in what sounded like a really compressed signal; very poor sound quality with an unnatural dynamic range. |
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04-25-2012, 02:28 PM | #65 |
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04-25-2012, 06:19 PM | #66 |
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