Amplifier feet--energy-absorbing? By Herbies Audio Lab?


#1

Herbies Audio Lab states on that site:

Tenderfoot isolation feet are the stock footers used with Purity Audio Design Statement Series preamps ($19,495-$31,995), Purity Series preamps ($25,995-$52,995), and new PS300B Ultra mono bloc amps.”

http://herbiesaudiolab.net/compfeet.htm

I presume they’re using a somewhat-generic name for the PSA BHK 300. Paul, is it correct that Herbies makes the feet for these big amps? I’ve ordered a handful of Big Tall Tenderfoot energy-absorbing feet plus Hi-End Booster Bases for my '250s. Maybe I won’t be using them.


#2

Hmmm. Not sure. If they do it’s something I am unaware of.


#3

They’re referring to a Purity Audio Design “Purity Series” mono amp, they have no relation to PS Audio.


#4
audio.bill said

They’re referring to a Purity Audio Design “Purity Series” mono amp, they have no relation to PS Audio.


Ahh! They omitted the ‘Purity’ label on the third item. TY, Bill.

I will be using the Tenderfoot and Booster Base energy-absorbing footers. FWIW, I’ll use, initially, per amp, two Big Tall Tenderfoot (BTT) Extra Firms and four regular BTTs, all on Boosters. Here’s a pic of a few Herbies footers I have.

2018Jan21_1030518_6-Herbies-footers_1500w.jpg

They seem to be very good at absorbing vibrational energy.

http://herbiesaudiolab.net/compfeet.htm


#5

I too have had good results with Herbie‘s products. I’ve used several different ones and they have almost always resulted in improved sound. And they are very cheap by audiophile standards.

Perhaps the most surprising result is the following. My SolidSteel audio rack has MDF shelves supported on inverted aluminum clones. I placed Herbie’s thin dots between the large upper end of the cones and the depression in the bottom of the shelves they support. I had no expectation that this would make any difference – I mean, how could a thin little layer change the sound? Well, you can guess where this is going; the sound was definitely cleaner with more detail. Go figure.


#6

Ah yes…he does call them ‘Grungbusters’. :slight_smile:


#7

I use the Grungebuster dots for my turntable. Large dots separate a four inch maple TT platform from the two inch maple audio rack shelf. They provide perfect, cheap isolation. And Herbie’s turntable mat is the best I’ve ever used, and I’ve been through many. It’s made from the same Grungebuster silicon material. For the BHK 250, I’m satisfied with the stock feet on a two inch maple audio rack shelf.


#8

I used to use the exact same 4" platform and Grungebuster combo for my turntable. Then I moved to a PowerBase. Whoa! That’s the ticket.


#9

Care to post a link for the PowerBase? I can’t find one.


#10

PS Audio is no longer selling them. You might find one used.


#11
magister said

Perhaps the most surprising result is the following. My SolidSteel audio rack has MDF shelves supported on inverted aluminum clones. I placed Herbie’s thin dots between the large upper end of the cones and the depression in the bottom of the shelves they support. I had no expectation that this would make any difference – I mean, how could a thin little layer change the sound? Well, you can guess where this is going; the sound was definitely cleaner with more detail. Go figure.


Very interesting magister, I will have to try! What thickness did you use, 1/16” or 1/32”?

#12

IIRC it was 1/16" – it was a long time ago. I’ll try to remember to take one apart the next time I’m in the listening room.


#13

FWIW, I ended up using all-Herbies’ products for footers under my '300s. I already had eight Tall Tenderfoot (‘TT’) energy-absorbing footers…
http://herbiesaudiolab.net/compfeet.htm
…but I thought they might not be tall enough for good ventilation. So I bought 10 Hi-End Booster Bases…
http://herbiesaudiolab.net/booster.htm

Turns out the amps weigh the most at the front panel, the end with most of the weight of the large power transformer, so I ended up using four standard-weight TTs for the four corners and one Extra-Firm TT centered under the front of the amp. Didn’t use the hi-End booster Bases.

The single Tall Tenderfoot footers raised the amp maybe a half-inch…


…so ventilation is excellent.

The amp wiggles quite nicely on the soft feet.


#14

And the sound?


#15

Don’t know; have never heard the amps ‘footed’ any other way.


#16

That’s fair. :slight_smile:

The picture and descriptions are certainly helpful, regardless. Many like Herbies.