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I want to know what the SP1-6000 long term power is at 4ohms.

Those look nice, but the data looks cherry picked. They need to provide information at 2, 4, and 8 ohms for each model.
 

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Man I've been eyeballing them over the rack mounted amps just because of the price difference.


Biggie for me is what happens below 12hz.
 

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From the comments from testing the qsc tells me that the fp more then likely did not have enough ac power to put out more. Maybe there is a 1500watt limit when not enough a/c power is available.




"CUTS BACK, BUT NEVERTHERMALS OFF. 2 &4 OHMPOWER WOULD HAVE BEENHIGHER BUT AC SERVICEWAS LOW B/C HOT DAY"
 

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Discussion Starter #8
"fp14k was 1500w at 2, 4, and 8ohm? When's the last time you've seen an amp behave that way?"


that was the medium term power test. the short term power test has the results that will be more familiar, as power goes up as resistance goes down. the problem he obviously ran into is that the 4800 watts into 2 ohm run only held up for...0.08 seconds. that is only 4 cycles of the 50hz test signal, so at that power, there is no "medium term".
 

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I like how he couldn't measure the iTech because it exceeded his rig. LOL


"COULD NOT TEST 2OHMS, DRAWS TOO MUCHPOWER!"

How about in dual 1-ohm like I do?


Note: I just reconfigured mine to run at 240v with a dual 20amp breaker (one for each hot wire).


"2 FANS EACH DRAWS 100W! A REAL SCREAMER"

Yes, I've said this at least once before.


Cherry picked to some degree perhaps. Still good results, but I want to see an independent test done by Crown or Gruppen.


How many seconds is long-term? We need enough power to get through a 5 minute song.
 

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Quote:
Originally Posted by LTD02  /t/1471303/lab-gruppen-fp14000-gets-spanked-by-plate-amp#post_23278952

http://www.speakerpower.net/comparative-performance.html


SP1-4000: 4000W into 2 ohms for 6.0 seconds.

FP14000: 1500W into 4 ohms for 0.5 seconds.


Review of SP1-4k: http://www.diyaudio.com/forums/subwoofers/187472-speakerpower-torpedo-sp1-4000-plate-amp-review.html

FP10000Q Clone was tested 3 years ago and produced 2000W/ch, 2 channels driven @ 40 Hz into 4 ohms continuous (per the tester: "Continuous" means 5 seconds or greater )


Something's rotten in Denmark.
 

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Jeff from JTR, I think, has a real FP7k, and since he uses the Speakerpower amps as well, maybe he can chime in?


I don't think there's any doubt that the Speakerpower amps are the real deal, but the tests on the itech, lab, and pl380 don't look right at all.
 

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Quote:
Originally Posted by BassThatHz  /t/1471303/lab-gruppen-fp14000-gets-spanked-by-plate-amp#post_23282055


I like how he couldn't measure the iTech because it exceeded his rig. LOL


"COULD NOT TEST 2OHMS, DRAWS TOO MUCHPOWER!"

How about in dual 1-ohm like I do?


Note: I just reconfigured mine to run at 240v with a dual 20amp breaker (one for each hot wire).


"2 FANS EACH DRAWS 100W! A REAL SCREAMER"

Yes, I've said this at least once before.


Cherry picked to some degree perhaps. Still good results, but I want to see an independent test done by Crown or Gruppen.


How many seconds is long-term? We need enough power to get through a 5 minute song.

In the details at the top, a 50A 120/208V line was listed. I believe most of the amps were run at 120V. The SP1-3200 & SP1-6000 were definitely run at 208V, as they need >180-200V to reach the maximum power indicated. You can see that the 3200 & 6000 models converge to match the long term power of the 2400 & 4000 as they are similar designs with different power supplies. Of course in listening no one uses maximum continuous power for 60sec unless the signal is hard clipped the entire time.
Quote:
Originally Posted by lukeamdman  /t/1471303/lab-gruppen-fp14000-gets-spanked-by-plate-amp#post_23282578


Jeff from JTR, I think, has a real FP7k, and since he uses the Speakerpower amps as well, maybe he can chime in?
Jeff had confirmed to me that the SP1-4k was clearly louder/stronger than one channel of the FP7k as a sub amp.


For the record, Brian from SpeakerPower is an engineer, and a rather poor marketer. The tests posted represent what he feels is the important metrics for a subwoofer amplifier, especially class D type designs where duration of power delivery varies greatly. We saw the efficiency come into play at Gorilla's sub meet where his 5kW Crown popped the breaker while the 3 SubMersive HPs plugged in up front did not.
 

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Quote:
Originally Posted by bossobass  /t/1471303/lab-gruppen-fp14000-gets-spanked-by-plate-amp#post_23282568

Quote:
Originally Posted by LTD02  /t/1471303/lab-gruppen-fp14000-gets-spanked-by-plate-amp#post_23278952

http://www.speakerpower.net/comparative-performance.html


SP1-4000: 4000W into 2 ohms for 6.0 seconds.

FP14000: 1500W into 4 ohms for 0.5 seconds.


Review of SP1-4k: http://www.diyaudio.com/forums/subwoofers/187472-speakerpower-torpedo-sp1-4000-plate-amp-review.html

FP10000Q Clone was tested 3 years ago and produced 2000W/ch, 2 channels driven @ 40 Hz into 4 ohms continuous (per the tester: "Continuous" means 5 seconds or greater )


Something's rotten in Denmark.

More likely that the properly working protection circuits limit the duration, where the Clones don't, thus allowing more sustained power at 4 Ohms and possible death at 2 Ohms. I know they copied the internal layout pretty exactly. Is the circuit design of the amplifiers similar (with exception of the limiting/protection circuits)?
 

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Quote:
Originally Posted by Mark Seaton  /t/1471303/lab-gruppen-fp14000-gets-spanked-by-plate-amp#post_23296132


More likely that the properly working protection circuits limit the duration, where the Clones don't, thus allowing more sustained power at 4 Ohms and possible death at 2 Ohms. I know they copied the internal layout pretty exactly. Is the circuit design of the amplifiers similar (with exception of the limiting/protection circuits)?

Of course the circuit design and layout is very similar in the 1/2 dozen or so Asian Class D amps I've messed with. Protection circuits are irrelevant with flat response to 2 Hz running stereo into 2 ohms playing WOTW at 0dBRL. Have you tried it with your SM amp?


Most likely the problem is in stereo operation with a 2 ohm load, which I wouldn't recommend for L/T'd HT subwoofer systems with any amplifier. Problems such as pumping can occur using a single side X2 that are eliminated by bridging, for one example. This is one reason I've never experienced problems running bridged 4 ohm vs stereo 2 ohm with the various iterations of Class D or so-called TD amps from Asia.


Most importantly, when the average driver is handed the keys to a NASCAR vehicle with no prior instruction, a crash is most likely to occur.


Who cares what a single channel does vs a monoblock? Why not run the 2 Ch amp as a monoblock as well if there's a comparison being made for SW duty?


The amp looks interesting, but there's no chance it hangs with the FP14000 bridged, cloned in any of its variations or actual LG.
 
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