posted
I'll make it clear up front. I didn't have enough battery to get the most out of the 4k2d nor was our impedance rise low enough to maximize either amp. Mostly because it was tested in a prefab ported box less than 2 cubes each sub, which is pretty small for two 12" square Hifonic Brutus's dual 2ohms. And if you don't know smaller the box higher the impedance rise bigger the box lower the impedance rise. And obviously subs play a roll with impedance rise too.
Battery: CS9000 or equal to 1 1/4- NSB90's, NSB G3100, odyssey 2150, PM 3100's etc.... Alternator: Ohio Alternator 180 amp. Nominal impedance in all test is 2ohms with a impedance rise in all test from 4.9 to 5.6ohms
43hz test tones with cross over full range or 100hz amp did same power.
Test tone power 43hz, 99-98 AC volts, 17.5-18 AC amps with a voltage drop to 12.8-13v=1782w @ 5.5ohms 144db peak
Power with music 94-90 AC volts, 19-19.3 AC amps with a voltage drop to 12.6 during peak music playing.=1814w @ 4.8ohms 142db average
Conclusion for 2k5d: It did better than what rated with the impedance rise to 4.9-5.6ohms compared to mfg rating. With a box with lower impedance rise you could easily expect close to rated non-reactive power. And we took temperature of amp after 30mins of music playing and amp was only 88 degrees. Not bad for being mounted to the back of a box. Over all killer amp for size and coming from a SQ PPI amp the amp sounded great.
43hz test tones with cross over full range or 100hz amp did same power.
Test tone power 43hz, 128-127 AC volts, 22 AC amps with a voltage drop to 12.2-12.5v=2828w @ 5.8ohms 145.7db peak
Power with music 123 AC volts, 23.9 AC amps with a voltage drop to 11.8 11.9 during peak music playing.=2939w @ 5.1ohms 144db average
Also did some .5ohms spl testing in our spl car NSB G3100 battery. Impedance rise needs to be close to 2ohms so amp won't go into protect but expect at least 4300w with a single good group 31 batter with a voltage drop to 11.4v. We tried it at .5ohms with the music box but the impedance rise was only to 1.4ohms from .5ohms and amp went into protect even with mute roll. It's a bad little MO FO.
Conclusion for 4k2d: Again this amp did better than MFG rating even with voltage dropping into the 11's. Like stated in beginning we didn't have enough battery to keep voltage in the 12's so I would recommend two group 31 batteries for optimum power for the 4k2d. This amp sounds great in my opinion. We tuned it to rock music and it was very punchy and my friend who was skeptical was impressed how good the amps sound. Also after 30 min of about 60% volume playing amp only reached 92 degrees. Much cooler than the 102 degrees the 4 channel PPI amp got to during the same run time. lol
I hope everyone take this information for what it is. And if you disagree with my testing or not this was my test results and I try to test as fairly as possible. Stetsom did a great job with these little amps and I'd be hard pressed to find this much power for this price for this small of a package. Next test will be the 600.4.
What was your battery voltage (no load)? The 2K5d was factory rated 1856 watts at 12.6 volts. Your test results showed a drop to 12.8 to 13 volts.
Posts: 2029 | From: Chicago | Registered: Jun 2005
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posted
way to go jeff, i been telling everyone since 05 that these amps are bad ass, and musical too!!! oh no now the secret is out, guess i wont have the advantage anymore.......and my amps are four years old used daily with the same factory fuses still in them.......NO problems with these amps..other than keeping speakers from frying...but i think i have that problem resolved....NEO DRIVERS BABY!!!!!!see ya in the lanes
-------------------- 12 VOLTS BABY!!!!! TEAM STETSOM USA & SALES REP TEAM STINGER BUY OHIO GENERATORS WORLD FINALS COMPETITOR 2005,2006,2008,2009 SUPER STREET 1-2 CERTIFIED 161.0 DB MARYLANDS LOUDEST DAILY DRIVER N.S.P.L. STATE RECORD HOLDER 2005,2006,2007,2008,2009 TEAM USAudio Stetsom Sales and Service stetsomrep1@hotmail.com Posts: 2226 | From: Maryland | Registered: Oct 2005
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quote:Originally posted by Team Maxxsonics - John: Good test Jeff.
What was your battery voltage (no load)? The 2K5d was factory rated 1856 watts at 12.6 volts. Your test results showed a drop to 12.8 to 13 volts.
Before burps or music no load voltage was 14.0-14.1v with alternator charging. Voltage during burp was as low as 13.0-12.8v during burps but with consistent full tilt music voltage would dip as low as 12.5-12.6v. Some of the voltage issue may have been because there was only a 2ga power wire coming from the front to the back battery. Maybe that wasn't enough for the alternator.
posted
The 4k2d is pretty amazing. Its alot more powerful then the 2k6d it replaced. Drove around for about 3-4 hrs each of the last two days and the things not even getting warm to the touch. I have it wired at 1.4 ohms pushing a eclipse ti-pro 18. I have it powered by an odyssey 1500dt and 1750 and a 300 amp alternator. No comps just a daily beater. The amp could use a subsonic filter but thats okay I just set it on the 360.2. The brazilian car audio amps remind me alot of swedish company lab gruppen that makes pro audio power amps. I'm from the old school and was use to using crown macrotech's, qsc's, and crest audio. The labs really save the back at 15-19lbs with 6-10k of power. The reason that I bring this up is because technology has come along way and I think the day of the 30-40lb surfboard amps are coming to an end.
Posts: 36 | From: richmond va | Registered: Jan 2006
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-------------------- The debate between Christians and athiest's has never been an intelectual one, but a moral one. When presented with evidence that they have no answer for they just sling mud and call us stupid! Posts: 694 | From: Michigan | Registered: Jul 2008
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posted
K- help me! Stetsom amps- having difficulty with the CLIP light and level matching. Bin doing hi-comp stereo installs for many many moons. Picked up an older 2k6d? (gave it back so dont remember the model numbers?) Had a PG MPS 2500 on 2x MJ 18" Mack5Audo subs= 2 ohm load mono. No prob- but not loaded down to get any real power. Put in a RF 5002- great punch, loads of volume & bass. THEN picked up a Used 2k6d. Wired it in. 1/0 cable. 1000 amp batt. Charging & running 13.7. Amp clips and then goes into protect. LOST a DBDrag event cuz it kep shutting down! Grrr. Deck goes to '50' on vol knob, at 20, the Stetsom would clip & go into protect. Guy whom I got it from is a Record holder, he was adjusting the gain and turning it down, & checking the voltage & it kept shutting itself off. BOTH other amps just wailed away. Hmmm. Gave amp back to fella. PICKED up 2 more 4K2Ds, used, same guy. He set RECORDS with these. IN MY truk, I have 8x IXL 12" Mach5AUDIO subs, dual 2 ohm, 4 per ported box. Each set of subs wired to 2 ohm mono to a RF 5002. 8 subs on 4 amps. LOUD as hell. Plays hours with truk off. 1000 amp up front, 2 Yellow tops in back, Alt putting out 15.3 when running. Volt meters on rear batts reading 13.7-14.1
Swapped out ONE Stetsom 4K2D for 2 RF5002s. Wired 4 subs parrallel, - dig meter read 1.8 ohms. Supposed to be 2 ohm mono stable. Guy had them wired to 1 ohm in his install. AND his was loud! 160 db Termlab.
SO, with a 150 amp wafer fuse, 3 batts, truk running, 13.7 at rear batts. 4K2D on 4 subs, other 4 subs have RF's on them ( hadnt changed out all the amps yet- just trying the 4K2D.)
Watching the RF subs stroke, raised 4K2d gain to match the sub travel and before it put out enuf to match the visible stroke of the RF- it went into clip and shut it self down! Time and time again. RF5002 just wailing away, no problems. Happy happy amps. 4K2D NEVER even popped the 150 amp wafer fuse, these amps just seem to go into clip and shut themselves off repeatedly.
WHY is this? IF 15.3 alt & 3 batts are not enuf to have ONE 4K2D play for more than 20 seconds- then its sure NOT a daily driver! RF's got me 4x 1st's, no hic-ups, no farting, no coughing, no thermaling, no shutting down, no protect- anything. Put these Stetsom amps in and to TRY to get the same volume as the RF, they just go into CLIP- whats the deal??? The RF 5002 puts out 1054 rms Mono into 2 ohm. I'm trying to get more power but have limited install space in the SQ vehicle. Fresh charge. Set the volume, other amps just rocking, turn the Stetsom up and it clips and shuts down- never even pulls enuf to pop the fuse- just goes into protect??? whats going on????
Posts: 1 | From: Canada | Registered: Sep 2009
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posted
and what was voltage on amp itself? having 150A fuse on such large amp is not good, you will overheat it!
Posts: 30 | From: SLO | Registered: May 2009
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posted
Have you measured your line out voltage off your rcas? To mch input voltage could be causing this issue, and i agree you need bigger fuses or no fuse from the rear battery to the amp.
Posts: 464 | From: West | Registered: Mar 2006
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posted
4k2d will shut off if being run at 1ohms for music with a low impedance rise, if it sees more then 14.8v or there is a small piece of speaker wire shorting out at the amps speaker terminal. Besides that a 4k2d should never shut off.
As for clip light even if you see it blink doesn't mean it's a full clipped signal. It could be just a light clipped signal. I've power tested with no clip and full clip and power isn't that much difference.
quote:Originally posted by CREATOR: K- help me! Stetsom amps- having difficulty with the CLIP light and level matching. Bin doing hi-comp stereo installs for many many moons. Picked up an older 2k6d? (gave it back so dont remember the model numbers?) Had a PG MPS 2500 on 2x MJ 18" Mack5Audo subs= 2 ohm load mono. No prob- but not loaded down to get any real power. Put in a RF 5002- great punch, loads of volume & bass. THEN picked up a Used 2k6d. Wired it in. 1/0 cable. 1000 amp batt. Charging & running 13.7. Amp clips and then goes into protect. LOST a DBDrag event cuz it kep shutting down! Grrr. Deck goes to '50' on vol knob, at 20, the Stetsom would clip & go into protect. Guy whom I got it from is a Record holder, he was adjusting the gain and turning it down, & checking the voltage & it kept shutting itself off. BOTH other amps just wailed away. Hmmm. Gave amp back to fella. PICKED up 2 more 4K2Ds, used, same guy. He set RECORDS with these. IN MY truk, I have 8x IXL 12" Mach5AUDIO subs, dual 2 ohm, 4 per ported box. Each set of subs wired to 2 ohm mono to a RF 5002. 8 subs on 4 amps. LOUD as hell. Plays hours with truk off. 1000 amp up front, 2 Yellow tops in back, Alt putting out 15.3 when running. Volt meters on rear batts reading 13.7-14.1
Swapped out ONE Stetsom 4K2D for 2 RF5002s. Wired 4 subs parrallel, - dig meter read 1.8 ohms. Supposed to be 2 ohm mono stable. Guy had them wired to 1 ohm in his install. AND his was loud! 160 db Termlab.
SO, with a 150 amp wafer fuse, 3 batts, truk running, 13.7 at rear batts. 4K2D on 4 subs, other 4 subs have RF's on them ( hadnt changed out all the amps yet- just trying the 4K2D.)
Watching the RF subs stroke, raised 4K2d gain to match the sub travel and before it put out enuf to match the visible stroke of the RF- it went into clip and shut it self down! Time and time again. RF5002 just wailing away, no problems. Happy happy amps. 4K2D NEVER even popped the 150 amp wafer fuse, these amps just seem to go into clip and shut themselves off repeatedly.
WHY is this? IF 15.3 alt & 3 batts are not enuf to have ONE 4K2D play for more than 20 seconds- then its sure NOT a daily driver! RF's got me 4x 1st's, no hic-ups, no farting, no coughing, no thermaling, no shutting down, no protect- anything. Put these Stetsom amps in and to TRY to get the same volume as the RF, they just go into CLIP- whats the deal??? The RF 5002 puts out 1054 rms Mono into 2 ohm. I'm trying to get more power but have limited install space in the SQ vehicle. Fresh charge. Set the volume, other amps just rocking, turn the Stetsom up and it clips and shuts down- never even pulls enuf to pop the fuse- just goes into protect??? whats going on????
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