FH9HVX - Budget Conscious 100w Class AB for Lean Times - Page 62

xrk971 · Yesterday, 02:16 AM

Hi Wtnh,
So have you had enough time to listen to the new FH9 amp to tell us your listening impressions? I think you have LX mini's for speakers?

wtnh · Yesterday, 03:16 PM

Only a few hours so far with my "street speakers", but I can say it is very clean in the midrange and high end and has plenty of low-end "grunt". I would describe it as effortless since it has so much reserve power.

I am still tweaking bias. My workbench area is a bit chilly (65 F) so it takes about an hour of playing at moderate volumes to reach thermal equilibrium.

Still to do - button it up and do some full-power dummy load testing and distortion measurements.

I may get brave and try it with my Martin Logans - but I will probably wait until I can install SSRs. I may a-b it with my McCormack DNA (500 Watts), but I suspect it will hold its own.

So far I am very happy with the sound! I would recommend this amp to anyone wanting to build a quality A/B amp and I am very glad I chose it.

xrk971 · Yesterday, 07:13 PM

Glad to hear that the amp is sounding promising. Effortless is a good word to summarize it.

Quote:

I am still tweaking bias. My workbench area is a bit chilly (65 F) so it takes about an hour of playing at moderate volumes to reach thermal equilibrium.

Your chassis heatsinks are probably oversized.

I would not worry about it reaching equilibrium - it gets there eventually. You can also leave it on - but maybe wait until you have an SSR speaker protect to do that.

dBel84 · Yesterday, 09:19 PM

Mine has been left on for weeks at a time. Still perfect and no bad behavior.

Yesterday, 02:16 AM	#611
xrk971 Got Foam? diyAudio Member Join Date: Oct 2012 Location: Metro DC (Virginia)	Hi Wtnh, So have you had enough time to listen to the new FH9 amp to tell us your listening impressions? I think you have LX mini's for speakers? __________________ XRKaudio https://www.etsy.com/shop/XRKAudio

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
I tried the ebay MX50 DIY Kit, Class AB 100W+100W; Worked but problem.	Buckeye	Solid State	93	24th September 2020 03:51 PM
December 2019, best sounding class D amp at the moment - Class of 100W @ 8 Ohm	Michelag	Class D	11	5th December 2019 04:05 PM
Make a class AB tube amplifier lean more towards "A"	jjasniew	Tubes / Valves	24	5th August 2019 02:32 PM
TDA7498 100W+100W Class D Amplifier	comasus	Class D	1	18th November 2015 10:05 PM
Audiom \| 100-W audio amp is 20 times more efficient than Class D chips	coloradosound	Class D	81	22nd June 2011 08:03 PM

New To Site?	Need Help?
Register to Participate Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

Yesterday, 03:16 PM	#612
wtnh diyAudio Member Join Date: May 2015	Only a few hours so far with my "street speakers", but I can say it is very clean in the midrange and high end and has plenty of low-end "grunt". I would describe it as effortless since it has so much reserve power. I am still tweaking bias. My workbench area is a bit chilly (65 F) so it takes about an hour of playing at moderate volumes to reach thermal equilibrium. Still to do - button it up and do some full-power dummy load testing and distortion measurements. I may get brave and try it with my Martin Logans - but I will probably wait until I can install SSRs. I may a-b it with my McCormack DNA (500 Watts), but I suspect it will hold its own. So far I am very happy with the sound! I would recommend this amp to anyone wanting to build a quality A/B amp and I am very glad I chose it.

Yesterday, 09:19 PM	#614
dBel84 diyAudio Member Join Date: Jul 2006 Location: midwest USA ~ WI	Mine has been left on for weeks at a time. Still perfect and no bad behavior.