| New Guy Signing In (and asking for help) [message #9000] |
Thu, 08 November 2007 15:55  |
bhall
Messages: 6
Registered: November 2007
Location: Indianapolis
|
Junior Member |
|
|
Good afternoon. I stumbled upon this forum a couple of weeks ago, and let me compliment the moderators and members on what a neat forum you have developed. Friendly, informative, helpful - and lots of eye candy on the website. I will pre-qualify any stupid questions I may ask by admitting I am a drummer who just happens to share your passion for vintage Kustom T 'n R goodies. Any talk of "ohms", "loads", "impedance", etc., may as well be in Martian as far as my comprehension goes, which brings me to my first round of stupid questions.
I recently acquired a K150-5 PA amp that I expected would come with the matched 4 x 8" speaker columns that were offered with this system. When I went to pick it up, I was surprised and delighted to find two 4 x 12" columns came with the amp. Only drawback was that one speaker had been removed from one of the columns. Now, for the questions:
1. The speaker that needs to be replaced is a CTS 8-ohm, 12”. Markings on the magnet are 5812218 and 038-0011-00, but I don’t know which one is the model number. Markings on the back of the cone are 12373. In reading some of the earlier threads, it appears Eminence makes a suitable replacement, but I can’t find a cross-reference. Can anyone recommend a good replacement?
2. Now it gets scary (for me). Since these were not the mating columns that originally came with the amp, I want to make sure the speakers are wired for optimum compatibility with the amp. The speaker outlet jack panel on the amp reads "one 8-ohm load or two 16-ohm loads". I will be trying to drive two cabinets, each containing four 8-ohm speakers and would appreciate any recommendations you may offer.
Many thanks!!
Bill
[Updated on: Thu, 08 November 2007 15:57] Report message to a moderator |
|
|
|
| Re: New Guy Signing In (and asking for help) [message #9001 is a reply to message #9000] |
Thu, 08 November 2007 18:21  |
chicagobill
Messages: 2006
Registered: April 2003
|
Senior Member |
|
|
Hey Bill, welcome to the board.
What are you going to be using the amp and speakers for? Vocals, guitar, pre-recorded music?
If you just want to replace the one speaker, then almost any 12" rated for at least 25 watts will serve fine in there. I'm sure that some of the other guys will have specific brands and models for you to consider, but it's only one speaker in an array of eight. Almost anything will blend in with no problems.
As for your impedence question, you're gonna have to make a few compromises. First off are you sure that the speakers in the cabs are 8 ohms? I thought that most Kustom pa cabs were loaded with 16 ohm speakers. Do you have a way to check them? Any ohmmeter will give you an idea of what is in the cabs.
If they are in fact all 8 ohm speakers, each cabinet of four eight ohm speakers can only be wired to be either 2 ohms (all in parallel), 8 ohms (series parallel wiring) or 32 ohms (all in series). So using two speaker cabinets, you will never get to the eight ohm load that the head is looking for.
You can wire both cabs to 32 ohms and end up with a 16 ohm load on the head (less power), or you can wire the cabs to be 8 ohms and load the head at 4 ohms (may cause the head to overheat).
Hope this helps.
|
|
|
|
|
|
|
|
|
|
| Re: New Guy Signing In (and asking for help) [message #9008 is a reply to message #9007] |
Fri, 16 November 2007 23:08 |
LesS
Messages: 478
Registered: December 2002
|
Senior Member |
|
|
Hi Bill,
Here is what I would do:
I would go with option 1 for your K150-5: two 8 ohm loads.
A Kustom K100 is also recommended for a 8 ohm minimum load and I used one for many many hours at 4 ohms. It usually will not hurt the amp, you just get distortion a little sooner as you turn up the volume control.
Putting in larger caps will make the amp a little better at running at 4 ohms.
-Les S
[Updated on: Sat, 17 November 2007 10:41] Report message to a moderator |
|
|
|
|
|
VintageKustom.com
Search
Help
Members
Register
Login
Home
]