RD D9 vs IA 40.1 vs AB500.1

Which amp is built better?
Which amp is stronger and puts out most power in a 14v setup?

From what I was told:
D9 is the cheapest made out of all the ones with similar boards. And the fets have like the smallest connections too the board that always break.

I have 4 D9s... never had a problem with them(on both 12/16v).... Sanman(16v) was the original owner and they survived him as well without any issues... I haven't used any of the other amps, so can't speak to them.

well to me D9s are bullet proof. weve put them in protect wired at .4 strapped 100000000000000000 times a night and they keep on ticking. i really dont know of anyone blowing one up with out a explainable reason that was probly thier fault.. so if DBR claims the others are built better then they must be great. but i dont see the output/spl being much different in either of them.. they are almost identical amps besides the caps in the center of the D9s.

d9 hands down ive had all the amps in ?

ab500.1 i clamped 8800@.25
40.1 (the touchiest amp i have ever played with)7300@.25
d9 as long as your below 17.8v@5 (this is where i got power at) did 10.2k

how low did your voltage drop jeff for the 10k and how many were u running and number of batts? i am still looking for 3 more D9

george szawan wrote:

how low did your voltage drop jeff for the 10k and how many were u running and number of batts? i am still looking for 3 more D9

he had 6 of them and I think like 20 batts, I don't believe he ever had any issues with them. That was in the truck, I don't remember how many he tested in the van.

george szawan wrote:

how low did your voltage drop jeff for the 10k and how many were u running and number of batts? i am still looking for 3 more D9

If I decide to let any of these D9's go, i will let you know... really only use 1-2 of the 4 I have right now

please let me know i am looking for 3 more

0n the 6 in the s10 i was on 24 batts at finals i went from 17.8-14.9

this is at .5 per amplifier is where i got the most power from themi didnt mess with them in the van much at all

2 d5 dropped 28 batts t0 14.5v though

D9 is still bullit proof, i dont care what the crabby MOFO at DBR says... im curious how the updated one works..

Skip01 wrote:

The D9 is a NEWER version of the 40.1, 500.1 board. It has a bunch of small rail caps rather than a few large caps. The capacity is the same combined. The D9 uses cheap Fairchild FDA24N40F output mosfets which are about half the cost of the IRFP360LC mosfets used in the 40.1, 500.1, etc.

I have 6 of the D9's in my shop right now. If you ever need them serviced, they are $300-$400 to rebuild. We do them all the time. Primary cause of failure is vibration breaking legs off the mosfets, right at the circuit board. They connect to the circuit while the amp is running, then disconnect, then reconnect, eventually the surge causes one of the mosfets to fail and it starts a chain reaction which blows the entire output section and power supply section if you have good enough batteries to blow the power supply. Some do, some don't. It all happens too quickly for the protect circuit to catch it. If your amps randomly go into protect, but then work fine later, you likely have this problem. We have a soldering upgrade that takes about 3-4 hours total that will solve the mosfet leg breakage problem. We do it to all our D9 rebuilds, and any other amps that use the spring clips and have the mosfets standing up along the edge of the board.

Alan wrote:

D9 is still bullit proof, i dont care what the crabby MOFO at DBR says... im curious how the updated one works..

Skip01 wrote:

The D9 is a NEWER version of the 40.1, 500.1 board. It has a bunch of small rail caps rather than a few large caps. The capacity is the same combined. The D9 uses cheap Fairchild FDA24N40F output mosfets which are about half the cost of the IRFP360LC mosfets used in the 40.1, 500.1, etc.

I have 6 of the D9's in my shop right now. If you ever need them serviced, they are $300-$400 to rebuild. We do them all the time. Primary cause of failure is vibration breaking legs off the mosfets, right at the circuit board. They connect to the circuit while the amp is running, then disconnect, then reconnect, eventually the surge causes one of the mosfets to fail and it starts a chain reaction which blows the entire output section and power supply section if you have good enough batteries to blow the power supply. Some do, some don't. It all happens too quickly for the protect circuit to catch it. If your amps randomly go into protect, but then work fine later, you likely have this problem. We have a soldering upgrade that takes about 3-4 hours total that will solve the mosfet leg breakage problem. We do it to all our D9 rebuilds, and any other amps that use the spring clips and have the mosfets standing up along the edge of the board.

Im with u, i never had a problem with mine at all, i just randomly asked him what he thought about him, cuz too me it was stronger than 500.1 and 40.1, i owned both too

ive heard of good gains over the 40.1 but some sound to good to be true for it to just be the basically same amp but slighty upgraded.. like over a db , thats alot..