| Visit Our Catalog at SteelGuitarShopper.com |

Post new topic Showman speaker options
Reply to topic
Author Topic:  Showman speaker options
Dennis Waltman


From:
Wisconsin, USA
Post  Posted 22 Jan 2019 9:50 am    
Reply with quote

I’m looking to take a 85 watt 1965 Showman head with stock 8 ohm transformer and pair it with some speakers I own. I’ll either have cabinets made or try and source some good used cabinets. My intent would be single cabs for each speaker to keep things manageable to transport.

The speakers are:
A 15 inch Peavey black widow, 4 ohm
2 Weber 12 inch California’s (Cali12F) with cloth dome covers, 80 watt rated, 8 ohm each

I’m not real
familiar with impedance matching and would like to know if pushing the 4 ohm BW would be ok?

Also, is there an option to use both 8 ohm Calis at once in separate cabs?

Any input on options would be appreciated.

Thanks, Dennis
View user's profile Send private message Send e-mail
Godfrey Arthur


From:
Philippines
Post  Posted 22 Jan 2019 12:30 pm    
Reply with quote

If the head wants 8 ohms going to 4 ohms will tax the amp.

You can't use two 8 ohms because it would either be 4 ohms:
8+8 in parallel = 4 ohm impedance or 8+8 in series= 16 ohms



Either way you're gambling.

You could get a single 8 ohm 15 or get two 4 ohm 12's and wire them in series to result in an 8 ohm load or two 16 ohm 12's wired in parallel to get an 8 ohm load.

Best to provide the amp with the impedance it wants to see rather than just put to use speakers you happen to have laying around.

Get another 4 ohm BW 15 and wire the two in series to get 8 ohms.

A dual showman used to be two 15's.



Or use just one 8 ohm 12.
_________________
From the Bronx via Manila
ShoBud The Pro 1
YES it's my REAL NAME!


Last edited by Godfrey Arthur on 22 Jan 2019 12:45 pm; edited 1 time in total
View user's profile Send private message
Chris Boyd


From:
Leonia,N.J./Charlestown,R.I.
Post  Posted 22 Jan 2019 12:43 pm    
Reply with quote

Dennis...Try it with just one of the Cali12F's ...if you don't like it, find a 15" 8 ohm speaker..I use an old 70's white ceramic EV SRO 15" 8 ohm and love it..
_________________
https://www.reverbnation.com/bigredandtheresonators
View user's profile Send private message Send e-mail Visit poster's website
Jim Kennedy


From:
Brentwood California, USA
Post  Posted 22 Jan 2019 5:09 pm    
Reply with quote

Been thinking of getting one of these impedance matchers: https://www.tedweber.com/gadgets/z-matcher

They match the amp and speaker from 2 to 16 ohms, either direction. One is 50 and one is 100 watts. I have a variety of speakers and amps in a variety of configurations. Seems this would eliminate the impedance mismatch problem.
_________________
ShoBud Pro 1, 75 Tele, 85 Yamaha SA 2000, Fender Cybertwin,
View user's profile Send private message Send e-mail
Tom Wolverton


From:
San Diego, CA
Post  Posted 22 Jan 2019 5:25 pm    
Reply with quote

I believe a 1965 non-reverb blackface Showman head usually has a 8-ohm output transformer, but some also had 4-ohm. You'll want to get the number off of the OT and check it with others. I believe there is an on-line source for these numbers.

I have a 1964 Showman head and I run it either thru a single 15" Telonics Neo (in a Rick Johnson cabinet). Or I often also run it with a single 12" TT speaker (in a different Rick Johnson cabinet). Both of these set-ups sound fantastic.



_________________
To write with a broken pencil is pointless.
View user's profile Send private message Send e-mail
Jack Hanson


From:
San Luis Valley, USA
Post  Posted 22 Jan 2019 6:37 pm    
Reply with quote

If you have a roadie, a lift truck, or a strong back, one of the best setups ever devised for the 8-ohm Showman head (as opposed to the 4-ohm Dual Showman head), is Leo's original Showman cabinet with the tone ring and a D-140F JBL speaker.
View user's profile Send private message Send e-mail
John Goux


From:
California, USA
Post  Posted 22 Jan 2019 8:57 pm    
Reply with quote

Does the Showman 8 ohms sound better than the Dual Showman 4 ohms? Why?
John
View user's profile Send private message Send e-mail
Tom Wolverton


From:
San Diego, CA
Post  Posted 22 Jan 2019 10:01 pm    
Reply with quote

I've owned both 4-ohm and 8-ohm heads and could not tell the difference in tone or power. (with proper speaker ohm match)
_________________
To write with a broken pencil is pointless.
View user's profile Send private message Send e-mail
Stephen Cowell


From:
Round Rock, Texas, USA
Post  Posted 23 Jan 2019 10:59 pm    
Reply with quote

If you parallel the 8's (makes 4) and then series that with the 4 you'll end up with 8ohms.
_________________
New FB Page: https://www.facebook.com/AustinSteelGuitarClub/?fref=ts
View user's profile Send private message Send e-mail
Dave Grafe


From:
Portland, Oregon, USA
Post  Posted 29 Jan 2019 8:52 am    
Reply with quote

The Showman and Dual Showman are identical except for the output transformer impedance, Showman is 8 ohms, Dual Showman is 4 ohms. Yes they sound the same because they are the same.
View user's profile Send private message Send e-mail Visit poster's website

All times are GMT - 8 Hours
Jump to:  
Please review our Forum Rules and Policies
Our Online Catalog
Strings, CDs, instruction, and steel guitar accessories
www.SteelGuitarShopper.com

The Steel Guitar Forum
148 S. Cloverdale Blvd.
Cloverdale, CA 95425 USA

Support This Forum



BIAB Styles
Ray Price Shuffles for Band-in-a-Box
by Jim Baron