Hafler XL600 Vs Hafler 9505 Much difference?

Also, isn't leaving off the top of the amp dangerous?

Well, for anyone interested. I finally got in a XL-600 amp to compare to the 9505 Model. The XL-600 is Much better. Richer, Fuller sound. As well as the bass being much tighter. The 9505 just couldn't handle the Polk Audio Rti-A9 speakers that are rated at 250 watts a channel and 500 peak. After listening to 2 songs with the XL-600 my girlfried says wow that sounds a lot better. She knows very little about audio and didn't even know what I was hooking up. I was going to bi-amp the Polks but I don't feel I even need to now. Amazing the amp was made about 25 years ago now.

Hi Larry,
I will give you a call. I am actually overseas right now.

Thanks for the help,
Terry

Hi Larry,
Sorry about the disconnect on the phone. When I had the Boston Acoustics A400's I found them very power hungry. I had them Bi-Amped with the XL-280 and found they sounded even better with the XL-600. Overkill yes but they sounded very sweet and needed a lot of power. I was also in my early 20's at the time and pushed them very hard.(Blew a few speakers back then). I don't know about the VS336 but I imagine it needs power as well.
I had a pair of Acoustic Research speakers I hooked up to my XL-600 back then. I don't remember the AR speaker name but it had four 12 inch woofers on each speaker. WOW. XL600 was clipping(I believe) at very high volumes. The sound would go flat or something like that. Not sure not an expert.
What is a Stereophile Class B rating?
Thanks,
Terry

Hi Larry,
Ok, that makes sense. The old A400's were a 4 Ohm load if I remember correctly. Thanks for the info. Now I just need to find a pair reasonable priced.
Terry

The XL-600 is stock. Did some more listening. The XL-600 has a great sound stage and imaging. Better than the 9505 in my opinion. BUT, after listening for a couple days, the XL-600 was very tiring on the ears. Lot of fatigue. That doesn't happen with the 9505. So I bi-amped them with the 9505 on the high end and the XL-600 on the woofers. Sounds excellent. Amazing and not tiring. The speakers were meant to be bi-amped. Sum it up. NO way the 9505 has the power to push the Rti A9's. Bass was very very loose with the 9505 alone. I thought it was the speakers. It was the amp.

Well, my XL-600 is having problems in one channel now, so I will be taking it to a repair shop. Maybe I will buy an upgrade kit for it as well. Hopefully, the Amp sounds more like the 9505 then?? Thanks for your feedback.
I have never heard a Pro5000 before. I will check out prices on that.
Thanks

Ok, assume I know nothing about audio, as that appears to be the case. :) What is a FRED bridge?

No, I looked at the link and it didn't mean much to me. I live in the Philippines and my biggest challenge at the moment is finding someone who will repair the Amps using my parts. I went to a chain shop yesterday that was recommended but I have to use their parts. Who knows what they would be.
I appreciate your input. I should be hearing back about a different tech recommendation today.

Hi Rodman99999 Got my Amp working. Something in one of the fuses only. I blew out the fuse cases and switched the fuses and it WORKS. Happy camper here.

I had taken it to a store here that was recommended but they insisted I uses their parts. Being in the Philippines I said NO way. :)