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JBL MS-8 Processor Integration Thread
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10-27-2010, 05:57 PM | #134 |
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Got myself a MS 8 today for my 07 335 with L7 and will be installing this weekend but abit confuse on how to wire them correctly. .
1) With oem being 9 channels and ms 8 only 8 channels. Am i right to say that i have to forgo 1 channel on ms 8 by spicing both side and rear deck speakers' wires together into 2 of the channnes in ms8? but that will mean 1 ohm load (since both rear and side are oem 2 ohm)??? 2) and also thought of adding a 10" sub in the trunk.Which wire shall i tap the signal from? Tapping from underseat sub??( R+, L-) ?? after oem L7 amp or after ms8? or either one? but again, wouldn't that lower the impedance of that channel? |
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10-27-2010, 06:15 PM | #135 | ||
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Check this post for connections: http://www.e90post.com/forums/showpo...5&postcount=22 |
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11-12-2010, 01:31 PM | #136 | |
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it says in the MS-8 manual max input volume on the low level inputs is 2.8v, the OEM unit when set to HIFI puts out 5v signal |
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11-12-2010, 01:34 PM | #137 |
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did some tuning today on the MS-8
for some reason when i set it up that i have 2 subs i can no longer set the fronts as high pass?? so if i have subs i must have fronts capable of going from 20hz-20khz?? i can run high pass on the sides and center, but not the fronts i don't want to run the underseat drivers as front low because that means i can no longer control their level seperately. would rather have their level controlled by SUB level. any advice? |
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11-12-2010, 01:44 PM | #139 |
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How are your outputs set up in the MS-8 and what are they connected to?
Here's mine: Channel 1: FR High (2 Way) -> Amp -> X-Over Channel 2: FL High (2 Way) -> Amp -> X-Over Channel 3: FR Low (2 Way) -> Amp Channel 4: FR Low (2 Way) -> Amp Channel 5: RR (High Level) Channel 6: RL (High level) Channel 7: Sub R -> Amp Channel 8: Sub L -> Amp In my case I can use the amp gains and/or the EQ to adjust levels. I've got my "quick and dirty" install done and will be tuning this weekend. Will be updating my other thread with the findings, and hopefully lots of TrueRTA data. |
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11-12-2010, 01:51 PM | #140 |
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You know, I've been wondering about this too. I would imagin that overdriving the signal would cause clipping at least. You could set things up to max out at 2.8V and never take it above that, but then your "bong" would be really loud. I wonder if adding an attenuator would help, or just add more "junk" to the signal. If nobody has an answer, I'll sift through the "big thread on the other forum" to see if there's anything in there.
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11-12-2010, 01:56 PM | #141 |
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ch 1+2 B quart RUA210 5.25" in the door and infinity EMIT tweeter in the sail panel
Ch3+4 logic 7 mids and hifi tweets (till i find some cheap logic 7 tweets) in the rear side panel Ch5+6 under seats subs (SWS-8i) ch7 logic 7 center speaker |
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11-12-2010, 01:58 PM | #142 | |
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they SUCK! it sounded a million times better with my soundstream but i am in the process of replacing all the crossover/bridging switches on it as some of them were bad. |
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11-12-2010, 02:09 PM | #143 | |
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Try setting your subs to ch 7+8 and using ch 5 for your center. See page 9 of the manual. I'll edit this again if I think of an answer. Last edited by Sirrus; 11-12-2010 at 02:17 PM.. |
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11-12-2010, 02:12 PM | #144 | |
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No "Bong" volume issues. |
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11-12-2010, 02:19 PM | #145 |
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I was only suggesting a "bong" issue is you limited your head unit output to 2.8 v and raised the amplifier gains accordingly. Technic, what are your thoughts about the 5 V head unit output vs the 2.8 V MS-8 max input?
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11-12-2010, 03:08 PM | #146 | |
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Anyways, when you run input setup -again, not required with HiFi balanced signals- the MS-8 shows its three "OK" when the OEM volume is 46-47 out of a maximum of 52 "clicks" of the OEM volume knob. That tells me that that 2.8V max input level is not that accurate. |
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11-12-2010, 04:20 PM | #147 | |
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When you set the underseat woofers at "subs", I think they will play in mono. Besides that, I believe the low-pass filter you select will automatically become the high-pass filter for the fronts. I tried it both ways, and it sounded much better with a 2-way front rather than 1-way + sub. |
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11-12-2010, 04:39 PM | #148 | |
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11-12-2010, 10:22 PM | #149 | |
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It's actually click 48 of 55 Just max the volume and count down 7 clicks So first click is 54, then 53 etc It sounds much better now I have my crossovers all set to 100hz high pass for all 5 speakers And low pass for the sws-8 Impressive Can't wait to try this with my Soundstream amp Thanks technic, never would have thought of using low level due to the 2.8v listed in the manual. |
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11-13-2010, 07:34 AM | #151 | |
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so 48 was perfect, that was the highest before it started saying noisy didn't know the clicks vary with firmware |
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11-13-2010, 07:43 AM | #152 |
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11-15-2010, 08:34 PM | #153 |
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Ok this ms-8 is a starting to frustrate me!
There is something not right with the crossover points Before I installed the ms-8, my door speakers were being high passed at 60hz at 12db/octave Zero issues, and they sounded great. With the ms-8 anything lower than 100hz they start to distort from too much bass. When I set it up with the under seats as subs It does not do the front crossover point correctly Only way around this is to set the under seats as 1(not 2) subs (to save a channel) And set fronts as 2 way (so i get the crossover crontrol back) and waste 2 channels as front left low, and front right low. I don't want to set it up as 2 way with the sws-8s as the low, because then I can't control their level with the sub level. I also can't set fronts as all pass, you can't have all pass on ANY channel on the ms-8 You HAVE to use the subsonic filter. So if I want to use the crossover in my amp, I have to run the signal through 2 crossovers The subsonic filter, then the crossover in the amp. what if i have a sub that goes below 20hz? why am i forced to use subsonic?? and unlike the 360.2 you can try different crossover settings till you find the right one for each speaker, you have to redo the entire setup for every change so 5min for each frequency you want to test there is no doubt it does amazing things to the soundstage soundstage is now firmly on top of my dashboard but i just can't set the crossovers correctly |
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11-15-2010, 09:04 PM | #154 |
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Think about how it works - logically, after each xover point change, it's going to change its DSP settings.
I would never play a 4 or 5 down to 60, and the 4 I wouldn't play below 100, and I have been doing this for over 20 years, so I'm not clear on your problem there. I select 20 hz and 6dB if I want no subsonic. Remember that the sub level control also boosts the midbass ABOVE the xover point. |
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