Kevin's Hafler p-500

[laatsch55]

Rather tedious eh??

 

[mlucitt]

Yes, short leads on the back of the board, multiple wires connected to the same solder pad, a steel chassis that bends when you drop the amp and is never right after that, and lots of wires that are the same color. Those are my major gripes. However, the amp is fixed and it sounds great. I may have to tweak the bias but I'm listening to some Sphongle right now and I have no complaints.

How long do I have to let a 1/4 watt resistor "burn in" to get the maximum sonic performance due to the alignment of the static DC regeneration factor and the heat absorption characteristics of the dielectric conformal coating to wire lead interface capacitance? Sorry, I just could not resist (ooh that was a pun).

 

[laatsch55]

Sounds like a 5 cup morning and that afterglow of a successful fix!!

 

[laatsch55]

Couple hours outta do it for resistor nesting.

 

[mlucitt]

My thoughts exactly. Ready for the next one, this time the offending channel board comes out right away and I'll check every resistor first!

 

[laatsch55]

That's one thing I definately take for granted, resistors. Whowudda thunk it??

 

[kevin]

Now ... let me ask this ? Im running a plate amp on my sub now...My sub... I think has two 8 ohm voice coils... Can I bridge that Hafler and run my sub ???

 

[laatsch55]

Are the voice coils in series or parallel? Have you measured the ohms accrposs the input terminals to see what the amp would be dealing with?

 

[kevin]

Nope !!! Of course not !! But I'd say ole buddy Sutton can do that for me !! I was just on the phone with him asking him If i could run that Hafler bridged ! I may end up getting me a different driver.

 

[laatsch55]

Dr. Lucitt needs to chime in here. Never had a Hafler in hand so I don't know if they can be bridged or not.

 

[mlucitt]

They have a convenient "Mono" switch on the back that will give you 800 Watts into an 8 Ohm load. Then you have to be careful which jacks you use for the signal going in (left) and the speaker wiring terminals (the two red ones). I think the back panel mentions that the left volume control then becomes the active control for the bridged amp.

Kevin, I sent the amp to the 204 Rigg Avenue address, was that right, that's where the return address said it came from...

 

[kevin]

Yea... Thats fine... Thats Sutton's UPS Store ! Tracey will call me as soon as it hits the door !!!

 

[laatsch55]

It's not a WOPL, It's not a WOPL, It's not a WOPL, It's not a WOPL............trying to help with the expectations.......

 

[mlucitt]

Hey, it works and that makes it all good. Plus, Kevin is going to use it in mono mode to power his subwoofer. It will do 800 Watts RMS into 8 Ohms in that configuration. That would make it almost half a WOPL, wouldn't it? The PL has 200 Watts on it out of the box, so let's keep it real.

 

[laatsch55]

Just messin with im Dr.

 

[mlucitt]

I know, just couldn't resist.

 

[laatsch55]

We count on that!

 

[ksrigg]

If the driver is dual voice coils and ohms each, can Kevin driver just one voice coil? Probably not, but just asking. I think he'll be finding a new driver...maybe the Crites , but I can't remember the fs on it..He's using a 300 watt plate amp now and wanted to go with th Hafler, but I think it will be looking at a ohm load...Anyone know a good 15 " driver for sub use that won't burn a hole in the wallet?

 

[mlucitt]

Kevin can drive whatever he pleases with the Hafler P-500. The key is the layout of the speaker, not the amplifier. If the speaker has one voice coil, it may be 4 or 8 Ohms. If it has two or dual voice coils (DVC) (they are usually the same) each one could be 2, 4, or 8 Ohms. If this is the case, the dual voice coils can be wired in series giving 4 (for 2 ohm coils), 8 (for 4 ohm coils), or 16 (for 8 ohm coils) Ohms (for a little better quality sound in series) or the dual voice coils can be wired in parallel giving 1 (for 2 ohm coils), 2 (for 4 ohm coils), or 4 (for 8 ohm coils) Ohms. Any stereo amp is unstable at 1 Ohm, this would only be useful for car audio applications. The Hafler will drive 2 ohms, but you will have to bump the speaker output fuses to 10 or 15 Amps because you may get peaks of 40 Amps. I would recommend keeping the output to 4 Ohms or more in bridged mode because at 2 Ohms you will be pushing 1600 Watts and there are not many speakers that can handle that much power. I'm just sayin'

 

[laatsch55]

Now your talkin a Soni amp. 1600 would be about right. The Soni's were sucking the Carver dry at 838 a side.