Speakerpower SP1-4000-HT plate amp
Hi, I just want to make a few comments regarding the Speakerpower SP1-4000-HT plate amp. I ordered one almost two months ago. I was told it was going to take at least three weeks to receive since they have to make it. I told them if they could do it in 10-days or so since I had my inlaw visiting and I wanted him to run the wires on my subs and connect the amp (he's good with electricity). Anyways, I got my amp shipped to my house in 9-days. I realize that Speakerpower has a lot of work, they provide amps to JTR, Seaton, PSA and Reaction audio. They went out of their way to make my amp and delivered it quickly, that's what I call customer service!!
I've been using the amp for a few weeks now and simply love it. It's powering four 15" JBL GTI MKII DVC6ohms subs in dual opposed sealed boxes. Each box is about 5cf and fully stuffed. All the subs are wired for a final load of 3ohms. The amps does 2,800/4 and 4,000/2 so at 3ohms I'm guessing it does somewhere between 3-3,500 watts which is perfect for my subs which handle 800wrs each. The amp is on the master box connected to a slave box. Both of my sub boxes are in the front corners of the room, which is about 5,500 to 6,000 square feet.
The only thing I found somewhat frustating was when the subs were on the auto switch of the amp. The amp seemed to be hunting for a signal to activate itself, it made clicking sounds. That was when watching TV. I put the switch to on, connected the amp to a smart power strip that I bought and that problem was solved. Also, the back of the amp is open which I find somewhat confusing since previous amps that I had always had the back covered. I wonder why is that? Should not the amp internals be protected with a cover? I don't see any heat sinks or fans on the amp either. Here are the things I like about the amp:
1. Power, there's plenty of it to drive all my subs to or near their limits. This is the most powerful amp I've used. Previous amps I had were Crest Prolite 3.0DSP, Yamaha P7000, ED LT1300 plate amp and Funk Audio 2,400Watts plate amp. Going by Notnyt's test of the SP2-8000 amp, I feel confident that this amp should do half the power of the SP2-8000 amp.
2. Efficiency, I believe this amp is over 90% efficient. Why is that important to me? I have it connected with the rest of my gear on one 15A circuit and so far, no problems whatsoever. It produces less heat and runs cool.
3. Size, it's a very small and lightweight amp, some six pounds or so. Also, I doesn't take any rack space like a regular amp would.
4. Quiet, I love this feature!! I can't overstated it. No need to mod fans or bright lights to worry about.
5. Gain/Volt issues when connected to a receiver, issues I had in the past. No bump boxes to worry about.
6. Built here and by its history, Speakerpower has been a very reliable brand.
7. Features, there's plenty of them. Gain, Delay/Phase, Crossover (to 120hz), auto/on/12v trigger, on/off swicth, speakon outlet out for a second sub, XLR/RCA inputs and LF Adjust. The LF is very valuable since you can adjust it to fit the size of your room. You can bump up the low bass or lower it, depending on your room gain. The Speakon connector out is also important if you need to connect a second sub to the amp, which is my case. Seaton Sound also does it with their submersives.
The negatives? These amps are not cheap but they have come down in price and have more features than before. For under $1,000, I think it's not bad, considering all you get. Are there better bang for the $ amps out there? Yes there are, but do they offer all of the above options? Also, I would like to see a more extensive DSP, perhaps some parametric EQ. In my case, my Denon, with its XT32 does a very good job with the sub's EQ. I took a couple of pics of the amp for you to see. Brian and co. at Speakerpower, great job!
Last edited by spanish68; 07-09-2016 at 05:23 PM.
Reason: Adding information.