Enjoy "Tech Bench" section
Teo
LC amps
Moderators: pompeiisneaks, Colossal
Re: LC amps
Thanks for the find. 
Re: LC amps
When he talks about the amps, he mentions his cab with EVM speaker, he says it has cylindrical baffles to give it more harmonic content.. wtf is that?
Re: LC amps
cardboard tubes (ports) in the front baffle board that the speaker is mounted on. As seen in many stereo speaker designs, P.A. and monitors. back is closed I think.Guy G wrote:When he talks about the amps, he mentions his cab with EVM speaker, he says it has cylindrical baffles to give it more harmonic content.. wtf is that?
Carlton cabs...
The cabinets are simply T/S designed cabinets that make the speaker "speak" the entire range that it is capable of reproducing. No big thing: plug in the numbers.
All I can say is that I'm 59 and I'm glad he didn't tell me anything I didn't know.
I'm REALLY glad that he reminded me of all of the things that I've forgotten, or blown off, that give the subtleties (magic) that I've neglected.
Maybe it IS a function of age
or 
, I'm still unsure... oh, wait... that's the Alzheimers.
Sheesh,
BTDT
Dave
All I can say is that I'm 59 and I'm glad he didn't tell me anything I didn't know.
I'm REALLY glad that he reminded me of all of the things that I've forgotten, or blown off, that give the subtleties (magic) that I've neglected.
Maybe it IS a function of age
or , I'm still unsure... oh, wait... that's the Alzheimers.
Sheesh,
BTDT
Dave
Re: Carlton cabs...
Damn... someone older than me... I'm just a baby compared to you (56)dBe wrote:All I can say is that I'm 59 and I'm glad he didn't tell me anything I didn't know.
Yes, he's a good communicator and doesn't keep secrets. I like that!!I'm REALLY glad that he reminded me of all of the things that I've forgotten, or blown off, that give the subtleties (magic) that I've neglected.
Damn Dave, you ok there? It almost sounds like you might have...... wait, what were we talking about?Maybe it IS a function of age
, I'm still unsure... oh, wait... that's the Alzheimers.
Sheesh,
BTDT
Dave
Re: LC amps
LC Masterclass in the latest Guitar Player, FYI.
Re: LC amps
Thanks llemtt
So much cool stuff in there Just enjoying the Larry and Robben performances mat
Re: Carlton cabs...
"Damn... someone older than me... I'm just a baby compared to you (56) "
Yeah, you're still a young buck.
"Damn Dave, you ok there? It almost sounds like you might have...... wait, what were we talking about?"
I might have a brain around here somewhere...
... there it is!
Back to speakers.
High Qts speakers (>.5 or so) are better suited for open baffles. Sometimes they can be used in closed boxes for bass use and guitar but they sound kind of constipated. I personally think that a speaker with a Qts over more than .75 should only be used in an open baffle. Then again, there are a lot of high Qts drivers being used in closed boxes f,or bass, so what do I know?
The old EVM12L speakers had a Qts of less than .3 if I remember correctly and the new ones are at .23. At this low of a Qts closed boxes are "best". .3 - .5 work very well in vented cabinets, with lower Qts requiring smaller boxes. One of the things that I like about Eminence drivers is the wide range of Qts low to high that they have. An alnico 10" has a Qts of 1.9! They have one that will work in about any box imaginable.
Yeah, you're still a young buck.
"Damn Dave, you ok there? It almost sounds like you might have...... wait, what were we talking about?"
I might have a brain around here somewhere...
... there it is!
Back to speakers.
High Qts speakers (>.5 or so) are better suited for open baffles. Sometimes they can be used in closed boxes for bass use and guitar but they sound kind of constipated. I personally think that a speaker with a Qts over more than .75 should only be used in an open baffle. Then again, there are a lot of high Qts drivers being used in closed boxes f,or bass, so what do I know?
The old EVM12L speakers had a Qts of less than .3 if I remember correctly and the new ones are at .23. At this low of a Qts closed boxes are "best". .3 - .5 work very well in vented cabinets, with lower Qts requiring smaller boxes. One of the things that I like about Eminence drivers is the wide range of Qts low to high that they have. An alnico 10" has a Qts of 1.9! They have one that will work in about any box imaginable.
Re: LC amps
So would you recommend the celestion 12-65 in this type of box?
Re: LC amps
rutledj wrote:So would you recommend the celestion 12-65 in this type of box?
I have no idea
Celestion doesn't publish T/S parameters, I can't find them on the 'net and I've never measured one. Without the parameters, box design is just a stab in the dark.
Sorry.
Dave
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Re: LC amps
I've never seen any guidlines for open back cabinets using T/S parameters anyway. Those guys were interested in ducted ports and closed boxes. The old Altec boxes for VOT and the 604 series broke all the rules. I talked to an old Altec engineer about a set of 604-8Ks that I had where the published numbers are clearly wrong and he said ignore all that. Eight cubic feet for all the 604s. Size the port by ear he said. Sheesh.dBe wrote:I have no idea
Celestion doesn't publish T/S parameters, I can't find them on the 'net and I've never measured one. Without the parameters, box design is just a stab in the dark.
Sorry.
Dave
The Last of the World's Great Human Beings
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Re: LC amps
[/quote] I've never seen any guidlines for open back cabinets using T/S parameters anyway. .[/quote]
I assumed the reference to the Reissue G12-65 was about using it in a vented cabinet. Maybe I missed point of his question.
T/S computations were gaining popularity here in the US in the early 70's. I have no doubt that HAD was into all types of research on the entire amp/speaker/cabinet system. Seems he is curious that way. Even his semi-open back cabinets appear to be tuned in some way. Probably by ear due to the size of the opening.
Just a trip into conjecture here.
Dave
I assumed the reference to the Reissue G12-65 was about using it in a vented cabinet. Maybe I missed point of his question.
T/S computations were gaining popularity here in the US in the early 70's. I have no doubt that HAD was into all types of research on the entire amp/speaker/cabinet system. Seems he is curious that way. Even his semi-open back cabinets appear to be tuned in some way. Probably by ear due to the size of the opening.
Just a trip into conjecture here.
Dave
Re: Carlton cabs...
Just wanted to clairify, L.C. uses the old EV (or has in the past) and the box is not "closed" (100%)dBe wrote:The old EVM12L speakers had a Qts of less than .3 if I remember correctly and the new ones are at .23. At this low of a Qts closed boxes are "best".
Re: LC amps
I have a clone of the LC/HAD type box used with old EVM12L. Sound is what you would expect. I tried a reissue 12-65 in the same box and the result was more bottom/bass than the 12-65 in other (1x12 open back & 2x12 open back) cabs. FWIWrutledj wrote:So would you recommend the celestion 12-65 in this type of box?