I was impressed with the Ampere 3800 that I reviewed a few weeks ago, so my eyes about popped out of my head when I saw that a 7500 had somehow made it's way to Tantric HQ.
I'm not exactly sure why this amp isn't currently offered in Ampere's line up. I think they got a few just to see if they wanted to offer it and didn't follow up or perhaps wanted to concentrate on the 3800.1. Or perhaps they didn't think there would be enough interest in an amp of this size. Well, let's see if it's worth any interest or not...
First impression... this bish is BIG. It's beefy as shit and surfboard size. It's difficult to get an idea of just how long it is in the pic, but it barely fit in the CRX lengthwise from front to back. It was against my driver's seat and barely had enough clearance from the back wall for the power and ground.
Dual power and ground. Triples would be nice, but not totally necessary. The set screws are phillips head. I used to hate them, but swapping amps in and out as much as I do, they're growing on me. If you use a properly sized screwdriver, it shouldn't be a problem. Ever. Besides, as many used amps as I run across, you people seem to have no trouble stripping Allen head screws anyway. And worse than stripping the heads out, the use of folding sets of hex keys seemingly lends itself to crossthreading and stripping of the actual threads. OMG. That is my biggest pet peeve ever.
Strappable. Lovely. And an on/off switch for the SSF. I like that since I never use mine anyway. And finally! a board with no bass boost. Who uses that shit?
Okie dokie. Let's test this big bish. Testing ground will be my CRX. Ohio Gen 300A alt, XS power 5100 underhood and (5) banks of caps. I don't show voltage drop in any of the pics, but the 2.5ohm is 14v and the rest dropped to ~ 13.5v.
Setting unloaded. 96.6v. That's tasty. You'll also notice I added a Velleman to the arsenal. That's Ryan's (StoveBolt) big, bald hed in the reflection, in case you were wondering.
2.5ohms resistive. 3,000w @ 2.5ohms & 14v. 86% efficiency
1 ohm resistive. 7,100w @ 1 ohm & 13.5v. 79% efficiency.
Let me digress here for a moment... You can see in the pic above that I had a little knob left before the amp got into a clip. I usually only report the results I get from where the gain and volume was set unloaded, but just to see, we adjusted the gain to get some clipping going.
Look at this shit. And I'm not picking on Ampere here. This is indicative of the kind of crap that happens when your amp gets dirty. I've just never done a pictoral on it. You know how when people say, "Oh, that amp is power hungry."? Yeah... this is probably why.
This is still 1 ohm resistive, but clipped to shit. This is another 1,400w, but it added another 220A of draw! Holy crap. So, 8,500w dirty @ 1, but dropped overall efficiency to 71%. No way is that extra 1.4k worth another 220A of draw. If you do the math on the difference, that's 1.4k with like 47% efficiency. Clipping sucks.
Ok, anyway... this is where it gets good. This is a clamp on sub. Same settings and everything but clamped traditionally on an SHD12 in the CRX.
Yep. 10,491w rising to .62 ohm at 13.5v. Ten thousand and five hundred watts.
This is tasty for a couple reasons. First... it's 10,000 friggin watts. And second... it played a .62ohm reactive load. I had to do this clamp 4-5 times to verify. I am duly impressed.
Ok. So, Ampere Audio 7500.1. Give it an extra volt on the 1 ohm test and it makes rated "certified". Impressive efficiency. Probably the best I've seen in any amp of any size. Plays stupid low reactive loads and makes a ton of power on 12v. Bonus... this thing is 18v stable. Bump that shit up to 18v and you have yourself a monster.
Ampere, if you're listening... get this thing into production ASAP.