Bare Knuckle Pickups Forum

Forum Ringside => Guitars, Amps and Effects => Topic started by: Jonesy on May 16, 2006, 07:49:36 PM

Title: Hotplate curfuffle
Post by: Jonesy on May 16, 2006, 07:49:36 PM

Im just abit clueless as to what the differences are between the differewnt ohmage ratings for the THD Hotplates...

                                      2 - 2.7 - 4 - 8 - 16

Title: Hotplate curfuffle
Post by: OD-Black_Fire on May 16, 2006, 07:56:18 PM

I believe you always should find the one that matches your cab's ohm'ag. Some of them can be switched, I believe.

Title: Hotplate curfuffle
Post by: Twinfan on May 16, 2006, 07:59:41 PM

You have to have one that will match an output from your amp...

Title: Hotplate curfuffle
Post by: willo on May 16, 2006, 08:17:17 PM

...or higher - you can use the 16ohm version with any lower ohmage cab/head combo, but for best results THD recommends using the correct ohmage. I haven't noticed any real difference between running an 8 or 16ohm on mine, however.

Title: Hotplate curfuffle
Post by: Jonesy on May 16, 2006, 08:28:02 PM

cheerrs,

does it work for a combo valve amp?

Title: Hotplate curfuffle
Post by: FELINEGUITARS on May 16, 2006, 08:29:01 PM

I THINK THE 2.7 MUST BE FOR A FENDER VIBROLUX OR SIMILAR
3 X 8 OHM SPEAKERS IN PARALLEL GIVES 2.66666 OHMS RESISTANCE

ALMOST THREW ME WHEN I SAW THAT

Title: Hotplate curfuffle
Post by: indysmith on May 16, 2006, 08:32:08 PM

Quote from: FELINEGUITARS

I THINK THE 2.7 MUST BE FOR A FENDER VIBROLUX OR SIMILAR
3 X 8 OHM SPEAKERS IN PARALLEL GIVES 2.66666 OHMS RESISTANCE

ALMOST THREW ME WHEN I SAW THAT

i was confused about that too. i don't understand why when yu add ohms together they don't add... i.e. why isn't two 8ohm speakers in a cabinet a 16ohm cabinet?

Title: Hotplate curfuffle
Post by: DeanS on May 16, 2006, 09:05:53 PM

Series wiring Impedance = Speaker rating+ Speaker rating

Parallel wiiring 1/I= 1/spaker rating+1/speaker rating

So for speakers in series just simply add the ohms, and for parallel its the reciprocal etc.

Title: Hotplate curfuffle
Post by: Jonesy on May 16, 2006, 10:25:35 PM

does it work for a combo valve amp?

Title: Hotplate curfuffle
Post by: TwilightOdyssey on May 16, 2006, 10:32:26 PM

Quote from: Jonesy

does it work for a combo valve amp?

Only if you can seperate the wire from the 'head' portion and the loudspeaker driver.

The wiring goes Amp out > Hot plate > Loudspeaker(s)

Title: Hotplate curfuffle
Post by: math2014 on May 17, 2006, 09:18:54 AM

And if i am not mistaken a 2-1 mismatch is ok.

ie. you have 8ohm hotplate you can use it with 16ohm cab/amp or 4ohm amp/cab.

Title: Hotplate curfuffle
Post by: Tellboy on May 17, 2006, 09:43:27 AM

I queried ohmage mismatch with THD. They said the internal circuit is optimised tonally for the stated ohmage but the Hotplate would work with speakers of the next rating but the tone may not be quite as good. You must set your amp to the correct speaker ohmage NOT the hotplate ohmage. i.e. I have an 8 ohm hotplate which I can use with a Marshall feeding 4 ohms of speakers - the Marshall must be set to 4 ohms not 8.