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Earthquake SWS-8xi 2ohm review
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05-29-2018, 09:52 PM | #45 | |
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And please, don't come on here telling people to run 2 ohm speakers on factory amps that were designed to run 4 ohm (and it is OK to do so because the voice coil is "higher"). Just because your amp has not fried yet does not mean somebody else's won't. Intentionally overloading expensive factory amplifiers like that is just plain ignorant and the smart thing to do is use aftermarket amplification, and separation of frequencies. Furthermore, you state "setting a range of 80-200 Hz on the underseats would sound terrible". Were are you coming from to make such a statement? - Just before I sold my 335i I had 10" mid woofers under the seats, driven 250W each. They were playing 55 - 110Hz, an even tighter range. If you had heard that set-up, you would have shut up real fast and admitted that you have absolutely no clue as to what you are talking about. Finally, you state in another post that "the impedance rating on a sub is done when the cone is at a neutral resting position" and you mumble about voice coil height and "resistance". That is just plain wrong on so many levels and I'm not getting into a technical discussion about loudspeaker design. Google is your friend here, and your teacher.
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05-30-2018, 11:00 AM | #46 | |
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1. Typically Impedance is measured in neutral position. That being said a 4 ohm sub will not measure as a 4 ohm sub. (3.5ohm) and a 2 ohm typically measures 1.5ohm. Common knowledge for anyone in this industry for 30 years. IMPEDANCE VARIES as a subwoofer plays. 2. The impedance DOES go down when a coil leaves its magnetic gap. The stock sub certainly has a shorter coil meaning that it is possible for it to leave the gap and have impedance fluctuations. What i think Sahyoun was trying to say is that the SWS appears to have a much longer coil and that even though it is 2 ohm it is more consistent than the 4ohm. 3. It is VERY common for an amp IC to be 2-ohm stable. And i have seen it mentioned that the stock amps are 2-ohm stable. That being said, this is still he said she said. I will see if I can find further confirmation. 4. Of course your 2 10" with dedicated amp sound better. You cant defy the laws of physics. That is a setup that easily costs double the money of two drop in SWS. 5. For someone with 30 years experience, your language is very vague. "The Earthquakes are terrible at midrange". How so? SQ? SPL? This is an industry filled with opinion so you should be specific. Moreover, sound is the most subjective thing to discuss so it is futile. For what they are worth, the SWS are a GREAT bargain and a noticeable improvement over stock. I have ran the SWS in about 4 different e9x cars without failure. The only failures I saw were online where some people blew the dustcap off. I have yet to see someone kill an amp from using the SWS.
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05-31-2018, 10:24 AM | #47 |
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^^^
1. Impedance is not DC resistance. Look it up. 2. Voice coils typically operate only within the magnetic gap. If they leave the gap, the speaker is overdriven and distortion occurs. Impedance is frequency dependent, not position of coil. 3. Even if the ICs can handle the load, the power supply may not. In any case, the amp will run hotter and will fail sooner. 4. The laws of physics apply to my claim that the Earthquakes cannot reproduce all frequencies well. My 10" woofers were optimized, by speaker design and installation position, to reproduce a tight frequency band. The Earthquakes cannot accurately reproduce frequencies above ~80Hz by design. 5. That was not my statement. I said they sucked at "mid-bass". This is roughly 100-200Hz, in this case. Male voices fall into this range, for example. Listen to Johnny Cash with the earthquakes, and then on a system with proper mid bass. You will not believe your ears! Also kick-drums, or the snappy bass from a bass guitar, will just underwhelm when using the Earthquakes. Again, try to compare, and gain some perspective.
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05-31-2018, 03:03 PM | #48 |
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Eq SWS woofers were the worst woofers I have ever used( and killed on 75w rms at 35-100hz).
I support/agree with everything that kaigoss69 stated above in his posts.
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05-31-2018, 04:06 PM | #49 |
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I had my stock subs fail on the stock amp, i've never had an sws fail on me but subs from any manufacturer can fail based on abusive use or in some cases a defect but having run 6 different SWS's on 3 different cars all with top hifi and not a single sub or amp failed. If you guys only knew what the SWS internals look like compared to every other shallow woofer you'd realize. The coil alone is wound more with a much larger travel capability. The main attracting point of the SWS is the patented mounting position of the spider, having it in line with the motor allows for the most excursion per unit mounting depth. All the shallow subs look like rip offs of each other except the SWS when it comes to internals.
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05-31-2018, 04:10 PM | #50 | |
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With regards to the power supply, it can handle it. These amps are rated for 600W and you really arent passing 400W total by much on the stock subs. What most people dont know is bmw has been using this same amp with different part numbers on multiple models that have varying impedance on not just the sub but the entire system. BMW just tunes the crossovers. I guess someone will just have to contact LEAR to get a straight answer.
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05-31-2018, 05:43 PM | #51 |
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Well for what it's worth, I googled for "Logic 7 amp internals" and came across information that leads me to believe the IC used is a "TDA1562". All the data sheets I have found for that IC reference a 4 ohm minimum load, and a maximum output of 70W (at 10% THD).
http://www.mouser.com/ds/2/302/TDA15..._SD-355606.pdf
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05-31-2018, 06:27 PM | #52 | |
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05-31-2018, 07:32 PM | #53 | |
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06-27-2018, 02:48 PM | #54 |
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This tread is too important to die. Thank you N54B30A. Gonna try this.
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12-08-2018, 05:47 AM | #55 |
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12-08-2018, 12:28 PM | #56 |
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BMW stereo types
http://www.e90post.com/forums/showthread.php?t=352586 http://www.e90post.com/forums/attach...2&d=1266451970 http://www.e90post.com/forums/attach...2&d=1260829447 http://www.e90post.com/forums/showthread.php?t=343673 http://www.e90post.com/forums/showthread.php?t=138949 http://www.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/attach...1&d=1209780865 http://www.e90post.com/forums/showthread.php?t=641323 http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/ http://technicpnp.com/menuDiagrams/d...e90_92_93.html http://www.musicarnw.com/page-2/ http://www.e90post.com/forums/attach...3&d=1169133185 http://www.e90post.com/forums/attach...4&d=1278871872 2 x70 W (4 Ω) Bass 6x40 W 40 (2 Ω) from the second link. Also from the first sentence of this entire thread. Last edited by ctuna; 12-08-2018 at 12:33 PM.. |
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08-08-2019, 04:29 AM | #57 |
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So...... Anyone blow up a L7 amp from installing 2ohm subs yet? I want to get the 2 ohms but this thread has been 50/50 on either 2 ohm or 4 ohm 😂. The talk about the 2 ohm sounding better is a nice plus🤷🏻*♂️
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08-20-2019, 05:57 PM | #58 |
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Sorry to revive an old thread again but I ended up going with the 2ohm one and made a how to on it. Hope it helps some people in making their decision!
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01-02-2022, 02:02 AM | #59 | |
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01-03-2022, 10:19 AM | #60 |
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None you can buy today AFAIK. They were old school Morels, and I had to totally destroy the plastic tubs (enclosures), as well as vent to the bottom (outside air).
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06-28-2022, 01:21 PM | #61 |
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For anyone wondering, Earthquake Sound just released some very in-depth video on the SWS in BMWs.
You can buy them directly from Earthquake Sound: https://earthquakesoundshop.com/?s=s...t_type=product For the record I've run these in 2 e90s, 3 e92s, my f87, my F15 and have NEVER had the subs or amp fail even after dropping to a 2ohm load.
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12-23-2023, 10:50 PM | #62 | |
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I’m so glad he made that video because nowhere does it say that those drivers use a neo magnet. Neo magnets are paramount to a high efficiency driver. I don’t know why Earthquake doesn’t advertise this anywhere. I also really like how passionate this guy is - and he well should be - because his design really is the best out there right now for shallow mount subs.
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01-19-2024, 10:03 AM | #63 |
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Reading some people with wierd ideas of what underseat xover points (55-200 is idiocy) should be and apparently trying to use these as mid basses. I ran my 8xi down to 24hz with a 30db slope on the match up7bmw in my f31. As I recall I was playing them only up to about 85-90 as they start localizing at about 86 ish,, and had them overlapped with the factory 4” which played down to 80 but had no authority until around 95ish… thus the xover overlap to use the 4 for localization and the SWS to help fill in volume level
SWS are subwoofers not mid basses. Mid bass is 80 and up. Read the specs, and compare the actual numbers. Best underseats out there and clean as hell , completely unlocalizable, when used and tuned appropriately.
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