cab problem

  • Thread starter Thread starter Jacko
  • Start date Start date
Farview,

So essentially you are saying you have to feed him half-truths and misinformation, cause he can't understand what's really going on? That neither helps nor protects him, as I see it. And you are telling me I've confused him? :p

I understand where you are coming from, but I have been bitten by doing that more than once. I run a small SR/Installation company, and am involved in SR education, on-the-job working with bands and employees, training end-users of installed sound systems, and am putting together a college-level curriculum for a local school. I have found that the best way is to find a simple but accurate explanation that covers the question, and opens the door if the person wants to go deeper.

After cleaning up more than a few messes I created over the years, I may be a little sensitive. :D And I know this is HR.com, not a pro site, but that makes me feel that accuracy from those who know the real story is even more important, as there is no content moderating, and posts from longer-time high post-count members with good rep like you are treated as being good solid info, generally. And usually is.

It's not that hard. Jacko-some speaker companies give incomplete specs. The ratings for your speakers are average, not peak power handling. Some tube amps put out way more juice than they are rated for. Your cab can handle 240W peaks, your amp is unlikely to hit that level, even if it puts out more than 120W. You don't need a new cab, unless this one turns out to be the wrong choice for other reasons, like tone or frequency response.

ggunn-

Here is a link to Rane's pdf on the subject. In addition, I have had quite a few discussions with a poster at Prosoundweb on the Live Audio Board called JR, a former engineer/product designer with Peavey and other companies. I posted to someone there about a year ago on this subject, and JR schooled me hard.

Rane notes


Sorry it's a pdf. I used to have a link to an html version, but I can't find it.
The rest of the notes are very well written and informative as well.

This explanation makes sense to me. BTW, I was taught the old story at a professional SR technical seminar about fifteen years ago, by the head of the SR division of a widely-known company, who regularly set up and installed massive systems, and was otherwise completely knowledgable. Until last year, I had no reason to think it was incorrect.
 
As a former designer/ modifier (I would do the mods for our endorsees) for Laney, Randall, KMD/Traynor, I know how this works.

I would expect to be taken to task for saying something like this at a pro SR board. This is a hobbiest board and it was a question about a guitar rig. You cannot mix and match guitar amps with bass or PA cabs, using the printed specs, without a problem.

I'm not saying he is too stupid to comprehend the real answer, I'm more or less figuring he isn't ready for it. If he doesn't know why his 4 10 cab is acting strangely when he turns up the low end, the difference between the way different types of electronics are spec'd out is not something I'm going to attempt to explain to him.
 
insted of blabbing on and on about how i dont understand, why dont you just call me a retard already

its not a bass cab, its a guitar cab, and what happens when you turn the low end up, my question was is there soemthing wrong with the speakers, i know that this is not the low end, if you heard it you would agree its not a problem with turning the low end but something else, probably the speakers, so my question was should i get a new cab, but insted everyone started argueing and speaking of me like im an idiot and im not going to read this. thanks anways but i think ill ask someone else that isnt going to treat me like a retard
 
You should get a new cabinet. Those Hartke guitar cabs were brittle sounding and really just pieces of crap.

I didn't mean to come off sounding like I thought you were a retard. The reasons for a lot of things go very, very deep and this was not supposed to be a discussion about any of what it turned into but it turned into a pissing match between the practical and the scientifically accurate. I apologise.

If your cabinet has 30 watt speakers (not vintage 30s) you are over powering your cabinet and that will kill your sound.

There is another, less likely, possibility. When was the last time it was re tubed? If you have access to another cab (a 4 12 would be great) see if the amp acts the same on that cab. If it does, it's time for new tubes.
 
its ok... i was just a little ticked off because you were mentioning mistakes i didnt make and saying i did, like the ohms settings, my amp runs on 16,8, and 4 and the cab has those selections too, there is a sound difference in the two, 16 is like a softer yet more over driven sound, 4 is a hard yet less gain sound

the last time i retubed was november, with some electro harmonix 6L6's, right now i dont have the money to retube but when i do i plan on getting some JJ's.

I have a friend whos uncle has some 80s marshall cabs, im gonna check those out...
 
I wasn't talking about you with the impedance thing, I was talking about random guitar players that I run into.

You are proving my point about posting too much detail. People don't read very carefully, not just you, almost everyone. It is very easy to get info turned around when posting too much.


Your tubes shouldn't be worn out yet (unless you have had them on 24/7 since November) The tube thing wasn't very likely. Try the Marshalls, see what happens.
 
Jacko said:
its ok... i was just a little ticked off because you were mentioning mistakes i didnt make and saying i did, like the ohms settings, my amp runs on 16,8, and 4 and the cab has those selections too, there is a sound difference in the two, 16 is like a softer yet more over driven sound, 4 is a hard yet less gain sound

Interesting. It's not unusual for amps to have different impedance settings, but I've never seen a impedance-switchable cabinet. I certainly haven't seen everything, though. Does it have a switch to change the wiring of the speakers between parallel, series-parallel, etc.?

Something you probably already know - you shouldn't run your amp at a higher impedance setting than the impedance of the cabinet you are driving. Equipment damage may result from doing that.
 
my amp and my cab both have switchable impedance settings... hey you never know when you might need it
 
seismetr0n said:
my amp and my cab both have switchable impedance settings... hey you never know when you might need it

Cool. How does the cab change impedances?
 
you just push a button.. :)









sorry, i dont know the electronics behind it.
 
Back
Top