Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Join
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Equipment
Subwoofers
what is low imp?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="sfall" data-source="post: 8576249" data-attributes="member: 673086"><p>"1) Impedance is not resistance; it's impedance, resistance is reserved for DC current. Impedance, in regards to car audio subs ratings, is typically a nominal measure of how much an AC current is "impeded" by the load. "</p><p></p><p>Like I've already stated, in context of this discussion, the industry treats the 2 as interchangeable. If you like, I can look up an example and copy and paste it for you.</p><p></p><p>"2) 2 ohms away from a dead short is very much an overly dramatic description. You are NEVER going to get close to a dead short with a subwoofer when it's wired at 2 ohms. You WILL NEVER reach an impedance below the DCR (DC Resistance) of the voice coil, which typically is only a few tenths lower than the rated impedance in most car audio subwoofers. Also impedance typically rises in practice due to heat, box rise, inductance, etc. You definitely can't make make a blanket statement about frequency's effect on impedance when a large portion of the dynamic load is due to extremely complex EM interactions between any induced EMF and the subwoofer motor."</p><p></p><p>2 ohm's away from a dead short isn't dramatic, its a fact. In this case we're dealing with a 1 ohm load, not 2. If you would set your system up to create a 1ohm load over a 4 ohm load, then go ahead and do it. Its you system. I disagree. I would only do a 1 ohm load if I was forced to.</p><p></p><p>"3) A 2 ohm subwoofer amp is typically designed to handle the higher current associated with a lower impedance load. Unless your charging system is garbage or you bought a low quality amp it won't be overly hard on an amp. Have some faith in the engineers who designed some of the solid amps on the market today. Note: Typically it's much cheaper per watt to purchase an amp that produces solid power at lower impedances, and that power isn't just "on paper." High voltage amps tend to be a bit pricey and to maintain a similar power output at 4 ohms or higher is cost prohibitive to most consumers. I can find you a dozen affordable,reliable amps that make 2000 Watts at one ohm and handle it all day. 2000 Watts is a lot more difficult to find at 4 ohms, and you will likely be paying for it unless your willing to go with a Brazilian design."</p><p></p><p>Sorry, but a 4 ohm load is much easier on the amp than a 1 ohm load. To avoid a bunch of back and forth posts that go no where, I got some info on Crutchfields web site.</p><p></p><p><a href="https://images.crutchfieldonline.com/ca/learningcenter/car/subwoofer_wiring/1-DVC-2-ohm-mono-low-imp.jpg" target="_blank">https://images.crutchfieldonline.com/ca/learningcenter/car/subwoofer_wiring/1-DVC-2-ohm-mono-low-imp.jpg</a></p><p></p><p>Notice the warning for 1 ohm use.</p><p></p><p>"4) As others said you seem to have the concept of parallel and series wiring backwards."</p><p></p><p>Anyone can, and will, claim anything to win an argument. I made the OP aware of my 2 word typo, and you're just going to have to be OK with it.</p></blockquote><p></p>
[QUOTE="sfall, post: 8576249, member: 673086"] "1) Impedance is not resistance; it's impedance, resistance is reserved for DC current. Impedance, in regards to car audio subs ratings, is typically a nominal measure of how much an AC current is "impeded" by the load. " Like I've already stated, in context of this discussion, the industry treats the 2 as interchangeable. If you like, I can look up an example and copy and paste it for you. "2) 2 ohms away from a dead short is very much an overly dramatic description. You are NEVER going to get close to a dead short with a subwoofer when it's wired at 2 ohms. You WILL NEVER reach an impedance below the DCR (DC Resistance) of the voice coil, which typically is only a few tenths lower than the rated impedance in most car audio subwoofers. Also impedance typically rises in practice due to heat, box rise, inductance, etc. You definitely can't make make a blanket statement about frequency's effect on impedance when a large portion of the dynamic load is due to extremely complex EM interactions between any induced EMF and the subwoofer motor." 2 ohm's away from a dead short isn't dramatic, its a fact. In this case we're dealing with a 1 ohm load, not 2. If you would set your system up to create a 1ohm load over a 4 ohm load, then go ahead and do it. Its you system. I disagree. I would only do a 1 ohm load if I was forced to. "3) A 2 ohm subwoofer amp is typically designed to handle the higher current associated with a lower impedance load. Unless your charging system is garbage or you bought a low quality amp it won't be overly hard on an amp. Have some faith in the engineers who designed some of the solid amps on the market today. Note: Typically it's much cheaper per watt to purchase an amp that produces solid power at lower impedances, and that power isn't just "on paper." High voltage amps tend to be a bit pricey and to maintain a similar power output at 4 ohms or higher is cost prohibitive to most consumers. I can find you a dozen affordable,reliable amps that make 2000 Watts at one ohm and handle it all day. 2000 Watts is a lot more difficult to find at 4 ohms, and you will likely be paying for it unless your willing to go with a Brazilian design." Sorry, but a 4 ohm load is much easier on the amp than a 1 ohm load. To avoid a bunch of back and forth posts that go no where, I got some info on Crutchfields web site. [URL="https://images.crutchfieldonline.com/ca/learningcenter/car/subwoofer_wiring/1-DVC-2-ohm-mono-low-imp.jpg"]https://images.crutchfieldonline.com/ca/learningcenter/car/subwoofer_wiring/1-DVC-2-ohm-mono-low-imp.jpg[/URL] Notice the warning for 1 ohm use. "4) As others said you seem to have the concept of parallel and series wiring backwards." Anyone can, and will, claim anything to win an argument. I made the OP aware of my 2 word typo, and you're just going to have to be OK with it. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Equipment
Subwoofers
what is low imp?
Top
Menu
Home
Refresh