JEFFYBOI Posted April 11, 2014 Report Share Posted April 11, 2014 So I grabbed a clamp meter today from work and wanted to try to clamp my amp. Now just throwing this out there that I havnt used a DD1 or anything to tune my HU or amp so im not gonna push it to much. I got the volume at 45/62. ( was told by someone else on forum the HU does 61/62 clean but not risking it until I check it myself) Amp is about 1/3 on the gain. the subs are wired 2 ohm load. So I connected DVM to the pos and neg on the speaker output and got 54V AC and I clamped the clamp meter around the pos wires and got 12 amp AC. I did this playing 40 Hz flat on repeat. So volts x amps = watts I got 648W? is this correct? does this mean the amp is roughly putting out 648W at a 2 ohm load or did I miss anything ? "Toyota Camry rebuild page 21 (link)http://www.stevemeadedesigns.com/board/topic/183768-94-crossfire-camry-18s-walled-singer-alt-has-arrived-rebuild-starts-pg-10/page-21 PIONEER DEH-P8400BH 2 CROSSFIRE C5 1700D 2 CROSSFIRE C7 18 HOOD. NSB GROUP48 TRUNK SMS AGM400 DUAL RUNS X SCORP 1/0 OFC 275A SINGER ALT. DYNAMAT XTREME SOUNDSTREAM TA4.280 PIONEER COMPONENTS Link to comment Share on other sites More sharing options...
pioneerforlife Posted April 11, 2014 Report Share Posted April 11, 2014 Clamping amps like that doesn't really work. that's why something like the AD-1 is so expensive. you have to also take into account box rise. so who knows the amp might be seeing 4 ohms or even higher at 40 hz. its not really a true test. 2007 Ford Focus SES Hatchback Pioneer HU 4 Digital Designs 9515i's in a B pillar. 2 Soundstream XXX 15K's (running at 16 volts) Soundstream Mids/Highs in custom door panels (getting rebuilt soon) Soundstream TA2.160 and TA2.400 Sky High and KNU wiring 3 Banks of Maxwell caps Winston Lithium (not a fan) Bump4Life 250 Amp Alt. aka USAlternators Soundstream Focus and Avenger Build Log Instagram @p4linnovation YouTube: Team Blowin Loud Link to comment Share on other sites More sharing options...
subsonicluv Posted April 11, 2014 Report Share Posted April 11, 2014 If you had a purely resistive load on the amplifier, then yes that number would be correct. Unfortunately it's not that easy. What you got was actually 648VA since the amp sees a reactive load. It takes the tools you already have plus an o-scope and some more math to convert your number to actual power. 04 Blazer Xtreme HU: Kenwood KDC-MP235 Front Stage: Lanzar MX6C Components Rear Stage: Lanzar MX693 6X9's Sub Stage: (2) Obsidian 18 D2 V2 Mids / Highs Amp: Boston Acoustics GTA 704 Sub Amp: Boston Acoustics GTA 1000m Optima Yellow Top (up front) Singer 275A Alternator Future Plans: One More GTA 1000m (maybe) More batteries More runs of 1/0 Pioneer DEH-X7500S (on order) Link to comment Share on other sites More sharing options...
JEFFYBOI Posted April 11, 2014 Author Report Share Posted April 11, 2014 Gotcha. Yeah I knew it wasn't a accurate test but thought I would try it. I just need to get that DD1, lol. Man I wish someone live close to me with 1. "Toyota Camry rebuild page 21 (link)http://www.stevemeadedesigns.com/board/topic/183768-94-crossfire-camry-18s-walled-singer-alt-has-arrived-rebuild-starts-pg-10/page-21 PIONEER DEH-P8400BH 2 CROSSFIRE C5 1700D 2 CROSSFIRE C7 18 HOOD. NSB GROUP48 TRUNK SMS AGM400 DUAL RUNS X SCORP 1/0 OFC 275A SINGER ALT. DYNAMAT XTREME SOUNDSTREAM TA4.280 PIONEER COMPONENTS Link to comment Share on other sites More sharing options...
TeamHT Posted April 11, 2014 Report Share Posted April 11, 2014 The 2 ohm load is nominal, not reactive, and does not take into consideration the phase angle. But to properly answer your question reverse the equation to find impedance. Tell me...does this smell like chloroform to you? Link to comment Share on other sites More sharing options...
JEFFYBOI Posted April 11, 2014 Author Report Share Posted April 11, 2014 The 2 ohm load is nominal, not reactive, and does not take into consideration the phase angle. But to properly answer your question reverse the equation to find impedance. So Volts divided by amps is 4.5 ohms? Does this mean roughly 648W at 4.5 ohms? Im getting confused now, lol.... and Im not familiar when you say phase angle? "Toyota Camry rebuild page 21 (link)http://www.stevemeadedesigns.com/board/topic/183768-94-crossfire-camry-18s-walled-singer-alt-has-arrived-rebuild-starts-pg-10/page-21 PIONEER DEH-P8400BH 2 CROSSFIRE C5 1700D 2 CROSSFIRE C7 18 HOOD. NSB GROUP48 TRUNK SMS AGM400 DUAL RUNS X SCORP 1/0 OFC 275A SINGER ALT. DYNAMAT XTREME SOUNDSTREAM TA4.280 PIONEER COMPONENTS Link to comment Share on other sites More sharing options...
pioneerforlife Posted April 11, 2014 Report Share Posted April 11, 2014 D'amore engineering has some good vids about this. 2007 Ford Focus SES Hatchback Pioneer HU 4 Digital Designs 9515i's in a B pillar. 2 Soundstream XXX 15K's (running at 16 volts) Soundstream Mids/Highs in custom door panels (getting rebuilt soon) Soundstream TA2.160 and TA2.400 Sky High and KNU wiring 3 Banks of Maxwell caps Winston Lithium (not a fan) Bump4Life 250 Amp Alt. aka USAlternators Soundstream Focus and Avenger Build Log Instagram @p4linnovation YouTube: Team Blowin Loud Link to comment Share on other sites More sharing options...
JEFFYBOI Posted April 11, 2014 Author Report Share Posted April 11, 2014 D'amore engineering has some good vids about this. Ya im looking more into it. Always learning something new "Toyota Camry rebuild page 21 (link)http://www.stevemeadedesigns.com/board/topic/183768-94-crossfire-camry-18s-walled-singer-alt-has-arrived-rebuild-starts-pg-10/page-21 PIONEER DEH-P8400BH 2 CROSSFIRE C5 1700D 2 CROSSFIRE C7 18 HOOD. NSB GROUP48 TRUNK SMS AGM400 DUAL RUNS X SCORP 1/0 OFC 275A SINGER ALT. DYNAMAT XTREME SOUNDSTREAM TA4.280 PIONEER COMPONENTS Link to comment Share on other sites More sharing options...
revoracing247 Posted April 11, 2014 Report Share Posted April 11, 2014 If you had a purely resistive load on the amplifier, then yes that number would be correct. Unfortunately it's not that easy. What you got was actually 648VA since the amp sees a reactive load. It takes the tools you already have plus an o-scope and some more math to convert your number to actual power. what would you use the o-scope to find? just interested in the how to do the process to find it I think you have a bit of truck stuck in your mud bro ~Ford Ranger, ext cabKenwood DDX4701/0ga stinger wiring for big 31/0ga ofc flextech wiring 3 kinetik 800's AQ2200 @1ohm Sundown Audio X15 in a 27Hz tuned ported box LE BUILD LOG!!! Link to comment Share on other sites More sharing options...
subsonicluv Posted April 11, 2014 Report Share Posted April 11, 2014 If you had a purely resistive load on the amplifier, then yes that number would be correct. Unfortunately it's not that easy. What you got was actually 648VA since the amp sees a reactive load. It takes the tools you already have plus an o-scope and some more math to convert your number to actual power. what would you use the o-scope to find? just interested in the how to do the process to find it IIRC, You would use it to measure the time difference between voltage and current. This is how you find the power factor. Tony explains it a lot better... 04 Blazer Xtreme HU: Kenwood KDC-MP235 Front Stage: Lanzar MX6C Components Rear Stage: Lanzar MX693 6X9's Sub Stage: (2) Obsidian 18 D2 V2 Mids / Highs Amp: Boston Acoustics GTA 704 Sub Amp: Boston Acoustics GTA 1000m Optima Yellow Top (up front) Singer 275A Alternator Future Plans: One More GTA 1000m (maybe) More batteries More runs of 1/0 Pioneer DEH-X7500S (on order) Link to comment Share on other sites More sharing options...
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