TESTED: 2008 Stetsom 4k2d and 2k5d for music.

[dtbrown 10+ year member]

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

2k5d:

MFG rating @ 12.6v, 4ohm non-reactive load 1850w, 2ohms non-reactive load 2500w

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 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.

4k2d:

MFG rating @ 12.6v, 4ohm non-reactive load 2800w, 2ohms non-reactive load 4200w

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. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Any questions feel free to ask.

Click to read more...

 

[audioarsonal 10+ year member]

Nice results.

 

[chunky cumz 10+ year member]

Wow, very interesting, i was wondering about these amps recently.

how much did each cost?

 

[dtbrown 10+ year member]

2k5d $799.99

4k2d $999.99

For size and power at 2ohms the price is killer.

 

[audioarsonal 10+ year member]

Yeah off one battery the numbers are pretty good.How do you think they would preform off a regular battery instead of the CS?

 

[dtbrown 10+ year member]

Yeah off one battery the numbers are pretty good.How do you think they would preform off a regular battery instead of the CS?

I would never recommend these amp or any amp that puts out 2k+watts to be on a stock/regular battery. You'll need some type of upgraded battery and electrical for sure.

We did test the 2k5d on a stinger 1700 right before we put in the CS9000 and the voltage drop difference for music was only .3v. But power was reflected by only 200w or so. Spl was reflected by only a couple tenths of a db too.

As stated in the beginning of test the CS9000 is only a little stronger than a good group 31 battery. I still at a minimum for either amp recommend a good group 31 battery like a stinger/odyssey 2150, nsb G1300/ nsb90, PM 3100 or two smaller batteries. But for the 4k2d one of these batteries I think is still pushing it. Two stinger 1700's or two NSB G3100 or equal would be best.

Keep in mind that yes you could use less battery but the amp won't be as strong as it could be.

 

[RipDaJacka]

i want a 4k2d

 

[dtbrown 10+ year member]

i want a 4k2d

Hit me up. stetsomusa@gmail.com

 

[audioarsonal 10+ year member]

I would never recommend these amp or any amp that puts out 2k+watts to be on a stock/regular battery. You'll need some type of upgraded battery and electrical for sure.
We did test the 2k5d on a stinger 1700 right before we put in the CS9000 and the voltage drop difference for music was only .3v. But power was reflected by only 200w or so. Spl was reflected by only a couple tenths of a db too.

As stated in the beginning of test the CS9000 is only a little stronger than a good group 31 battery. I still at a minimum for either amp recommend a good group 31 battery like a stinger/odyssey 2150, nsb G1300/ nsb90, PM 3100 or two smaller batteries. But for the 4k2d one of these batteries I think is still pushing it. Two stinger 1700's or two NSB G3100 or equal would be best.

Keep in mind that yes you could use less battery but the amp won't be as strong as it could be.

Thanks for the info.

 

[denali804 10+ year member]

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.

 

[C3 Customs 10+ year member]

.....Honestly I'd like more people to have their hands on 4k2d's and 2k5d's and share their results. The people that do have these amps are not on the boards or just don't share feedback. But thanks for keeping the conversation positive and maybe in the future you'll give us a try.

Just thought I would highlight this review and let people see what these amps can do...

 

[n8skow 10+ year member]

still have the 4k2d?

I need power (~4000watts)

will it do 1-ohm stable okay?