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E90 Professional HiFi stereo upgrade
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10-07-2008, 08:35 AM | #45 | |
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10-07-2008, 08:37 AM | #46 | |
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10-08-2008, 06:30 AM | #47 |
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Yep - more tweaking
An audio frequency analyzer would really come in handy about now. A decent mic + laptop + software would do the trick - I wonder if sw exists ... I upped the gain on the lower frequencies for the front and rear a few db's and it helped to warm the sound. I also had to reduce the upper freq's on the sub channel because it was clipping the under seat subs. I've rolled off the high-mid's almost completely and brought up the highest freq on the EQS. The tweeters are not getting swamped now but I still consider them to be lacking. At this point I have shaping control and I am compensating for the factory speakers. I will consider the bsw stage 1 speaker upgrade for the next step. |
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10-09-2008, 03:23 PM | #48 | |
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It has 5 channels including a Class D amplified subwoofer channel, differential inputs and also a preout if I need an additional amplifier for a separate subwoofer later on Hopefully this combined with the SWS-8 woofers I've ordered will scare some life into the sound system Also on a sidenote: I peeked under my seats today, and my sub enclosure appear to be ported towards the rear / back seat, not toward the side, so hopefully I won't get the sideskirt rattle problem (My car is german / european spec). |
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10-10-2008, 06:57 AM | #49 | |
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I think I cooked one of my factory subs by driving them with lower frequencies from the EQS. |
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10-13-2008, 04:34 PM | #50 |
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Update -
I haven't replaced the seat "subs" yet but lowered all freqs 60hz and below and I am just using them to augment the 4" drivers for bass. At least the seat subs are not making protest noises. (one is weaker than the other). I still plan to replace them. After hitting them with a puny 45 watts and lower frequencies they stand out as the weak link. I decided to install my Infinity Basslink in the trunk (left over from my e36) and it helps. The crossover on the basslink is at the default. No point in filling the trunk with 100+ hz bass I can't hear. Current Setup: From the [STOCK HU] : Front Out --Y-> [EQS FRONT IN] - [EQS FRONT OUT] -> [Alpine 3527V chan1/2] -> Door Speakers Front Out --Y-> [EQS SUB IN] - [EQS SUB OUT] -> [Alpine MRP T306 chan1/2] -> Seat Subs Rear Out --Y-> [EQS REAR IN] - [EQS REAR OUT] -> [Alpine 3527V chan3/4] -> Deck Speakers Rear Out --Y-> [BASSLINK IN] Last edited by fdiprete; 10-13-2008 at 04:58 PM.. |
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10-18-2008, 10:23 AM | #51 | |
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It's so good that I'm a bit uncertain wether the SWS-8s will be installed at all, but only listened at stand-still so far, will take the car for a spin tomorrow (too hung over at the moment ) Only problem is that I have some background hiss/whine, and for some odd reason it seems to come from the speakers under the seat. I've changed both the cables and contacts (all cables are connected to the original wires for the bmw amplifier), but didn't help. As long as the amplifier is on, the sound is present. It does not change with rpm, and the volume of the noise is the same regardless of gain settings.. The amplifier has RCA inputs even for the fifth (subwoofer) channel, but I don't use these (the amplifier sends output to this channel even though only input channel 1 through 4 is connected). So I'm wondering if this can have anything to do with it. I tried connecting terminated/dead end RCA plugs in the inputs for the subwoofer channel, but that didn't make any difference.
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10-19-2008, 07:52 AM | #52 | |
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Slight hiss and whine that did not change with rpm. I solved the problem by: 1) using rca Y cables to go from the front outs into the SUB input of the EQS 2) rolling down the input gain on the EQS 3) adjusting the output gain. High input sensitivity caused noise problems for me. (see text in my previous post) Result is damn near silence. I checked the manual on your kicker amp and it has rca inputs for the sub channel and adjustments for in/out gain. I'd try using a Y adapter to use the sub inputs and make adjustments. It should not make a difference but in my case it did. Having signal on that input was different than using the internal channel bonding. - but - If you are using channel 5 to drive both seat subs then they must be wired in parallel ? That would be bad. The stock subs are 2 ohms and wired in parallel they would have a total impedance of 1 ohm. yikes! They won't last long. |
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10-19-2008, 01:05 PM | #53 | |
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Yeah, I guess the original speakers are running at 1ohms now, probably not ideal for the speakers or the amplifier. Wonder if that could cause the sound somehow. But I'm not playing very loud - hopefully my pair of SWS-8 will arrive soon.
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10-20-2008, 07:01 AM | #54 | |
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If it's not exclusively causing the problem it is at least making it hard to isolate the cause. A much lower load on an amplifier circuit changes the bias characteristics is a very big way. All bets are off http://www.tpub.com/neets/book7/25c.htm When you get that changed out, check your ground connection for the amp. I am using the grounding block above the wheel well. There is one on both sides of the trunk. It has a bunch of brown wires attached to it. |
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10-21-2008, 02:04 PM | #55 |
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Moved and fitted the amplifier properly, and it seems like the attentuator whine vanished. I'm using the grounding bracket on the left side.
Also I disconnected one of the speakers under the seats so the load is back to 2 ohms I guess that'll have to do until the SWS-8 pair arrives. Got some permanent whine/hiss (can only hear it when there's no music), I'll look more into that and will try to split the front signal so I can input it into the fifth input channel on the amplifier when the new speakers arrive. Here is what it looks like so far
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11-16-2008, 03:12 PM | #60 |
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SWS8 in place
Finally got around to mounting the speakers - very happy with the result.
After a bit of experimenting I ended up stuffing the enclosures almost ending up with a closed enclosure (or to be more specific, similar to putting a foam plug in a ported loudspeaker). This gave the best and cleanest bass, although sacrificed a little bit of the deepest frequencies. The sound is now powerful and clean with plenty of bass, working extremely well on rock tunes, but also good for general pop/rnb/dance music. Also wanted to note that I've actually turned down both treble and bass to negative settings to help the midrange appear. I think I'm running treble at -2 and bass at -3 (helps the main speakers focus on other things but bass, and I can control the basslevel freely from the external amplifier by adjusting gain on the subchannel). I find this works very well. After these adjustments combined with the new amplifier and SWS-speakers the total sound experience is now far superior to the original hifi sound system. Just thought I'd share it to give people some alternative ideas. A few pics of the enclosures: (note that the hole for the original cable socket was stuffed extremely tight with foam after mounting the speaker to ensure that air don't go through there, but mainly escapes through the original port)
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11-17-2008, 08:37 AM | #62 | |
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The original enclosure with the quite large port doesn't look all that scientific to me (that port is probably not matched and tuned to the original speaker, and certainly not to the aftermarket SWS-8). So my approach was that heavy damping and basically closing up the enclosure would give cleaner and less boomy sound - which appeared to work out well.
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11-20-2008, 02:08 PM | #63 | |
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11-24-2008, 10:49 AM | #64 |
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Hey guys, what do you think of the 2-ohm SWS 8" ?? I know most people run the 4ohm version because that was what was available but i have source the 2-ohm version that matched the 2-ohms on the factory amp. I'm just looking to get more and cleaner bass. will this be enough? i dont turn up my bass TOO loud, i like it smooth and stealty
http://cgi.ebay.com/NEW-EARTHQUAKE-S...QQcmdZViewItem what do you think? |
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11-28-2008, 08:31 PM | #65 |
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I an also thinking of using the 2ohm version.
My 2 channel amp doesn't have the power to do the 4 ohm version justice. It's also compatible with the factory amp at 2 ohms so easier to revert ... |
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04-20-2009, 07:00 PM | #66 | |
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EQS
Hello everyone, I'm reviving this old thread. I have a 335i sedan with hi-fi non-logic system. Recently I did an upgrade to the stereo system. It consist of: HU-OEM ==> SVENR==>4-band EQ ==> alpine pdx-5. It move two components at the front doors (Focal 100KP), two coaxial at the rear (Focal cvx) and a subwoofer at the trunk (earthquake).
It is possible to connect the OEM HU outputs directly to the EQS speaker level inputs? See picture bellow. I want to remove the 4band EQ which help tweak the sound quality but it could be better. Quote:
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