Our Guitar Amp Project

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#21
After 14 hours breakin on stereo.
Change is mainly in suspension compliance/Fs as would be expected.
Temperature has gone up here and I do tend to find
compliance to be temperature dependent.
Change is small - less than 3%.

This is the last test before real use of the driver:

Measurement date: 5/10/07
Model: Weber Ceramic Sig 12F-B
Serial: #12790716
Cone Marking: 12781 4806
UNIT SAMPLE: PLB #1
UNIT DATE: April 2007
Condition: 14 hrs on stereo bass up

Delta M 15.75 grams
Fshift -20%
Fs 78.4 Hz
Vas 52.3 liters
Re 6.82 ohms
Qe .74
Qm 12.8
Mms 28.4 grams
no 3.27 %
SPLref 97.1 dB
Bl 11.4 T-m
Qts .70
Cms .145 mm/N
 
#23
Hello people,

Currently I have a Marshall 30W for my Les Paul and looking forward to go to a 100W or + Tube Amp. I'd love to build myself an amp like that but I've been reading in forums and web and still confused

Any suggestions?

Thanks in advance for your advice.
 
#24
Re: O/T

head_spaz said:
Maxwedge !!!

As in 413/426 Ramchargers? Stages I,II,III ???
Been there... done that!

deewm at swbell dot net
subject line password = Allow Me

(sorry for the off topic... the diy e-mail function never works for me.)
Click to expand...

Yep, thats what the nick stands for!:bullseye::c_flag:

Wish I had one of those 426's stashed away so I guess I'll have to do with a lowly 440!😀
 
#25
#26
distortion30 said:
Hello people,

Currently I have a Marshall 30W for my Les Paul and looking forward to go to a 100W or + Tube Amp. I'd love to build myself an amp like that but I've been reading in forums and web and still confused

Any suggestions?

Thanks in advance for your advice.
Click to expand...

Weber has kit versions of the classics and some of their own designs:
https://taweber.powweb.com/store/kits.htm

Pete B.
 
#29
Paul suggested that I listen to one of the world's greatest slide guitar players, Derek Trucks:
http://www.youtube.com/watch?v=Vuadh1o0yC8

We looked up his rig, he uses a 1965 Fender Black Face Super Reverb, with Pyle Driver speakers:
http://en.wikipedia.org/wiki/Derek_Trucks

From: http://newsgroups.derkeiler.com/Archive/Alt/alt.guitar.amps/2005-08/msg02893.html

"His main amp is a '65 Blackface Super Reverb, loaded with
Pyle Driver MW-1040 speakers. (These are *not* "car audio"
speakers as you may have read on the Net.) The speakers
were made in 1980, same year Derek was born."

"This amp is outfitted with a custom speaker made
by Ted Weber, called the DT-10 V1.1. (I have the
exclusive on this speaker, so if you want a set,
see my sig.) This speaker was originally developed
for use in the custom design Super Sixes I built for
Derek to use with the Allman Brothers. It's essentially
a clone of the 1980 Pyle Driver MW-1040. "

Interesting!

Pete B.
 
#30
Hi Pete,

AOL shut down your project site.

That stinks!

Do you have another place where I can see it? I was impressed when I saw it last. A member from another Guitar Forum I belong to (Vanderbilly.com), was looking for ideas on building a 2X12. I was going to send him here. Your link was real informative!

Thanks!

Regards//Keith
 
#32
KP11520 said:
Hi Pete,

AOL shut down your project site.

That stinks!

Do you have another place where I can see it? I was impressed when I saw it last. A member from another Guitar Forum I belong to (Vanderbilly.com), was looking for ideas on building a 2X12. I was going to send him here. Your link was real informative!

Thanks!

Regards//Keith
Click to expand...

Sorry, I only just noticed your post. I didn't think there was that much interest so didn't reload that page - let me see what I can do to get it going again. Thanks for your interest.

BTW - Paul likes the Weber speakers very much compared to the 10s in the line6, so we transplanted his line6 amp into our box for now. The Webers are an excellent value.

Pete B.
 
#33
FastEddy said:
" ... We looked up his rig, he uses a 1965 Fender Black Face Super Reverb, with Pyle Driver speakers: http://en.wikipedia.org/wiki/Derek_Trucks ..."

For much more of Derek's work, view the "Crossroads Guitar Festival" DVDs. He is prominent on both, backing up Eric and friends ... includes some solo work. (Audio tracks on these DVDs is dramatically better than the CDs.) 😎
Click to expand...


I'll check that out. He has his own band and a DVD out as you probably know:
http://www.cduniverse.com/productinfo.asp?pid=7217588

He is married to Susan Tedeschi:
http://www.youtube.com/watch?v=zs50uz3a_-M
 
#36
Hi,

I'm curious about the emphasis on low frequency reproduction towards the end of your site.

Even when drop tuned to C#, 70Hz isn't a huge requirement from a pair of 12" drivers. Consider that it'd be mostly distorted signals going in (when drop tuned like that), and the low frequency extension isn't needed.


Chris
 
#37
Hi Chris,

It is all relative I suppose but I don't think any of the classic vintage speakers or enclosures are in any way optimally designed - that is all I was trying to point out.
The open back cabinet probably came to be because there had to be air flow to cool the tubes in the old combo amps however that makes them essentially a dipole. You can read about dipoles here and note the 6 dB peak, and then dip in the response:
Electro-acoustic models

I would say that the commonly used guitar speaker drivers are not optimized in any way for sealed box systems either. Better optimized speakers simply means the box could be made smaller for equal output or performance trades could be made in other ways.

I doubt that drop tuning increase the distortion at the source. Speaker bass distortion with guitars does not usually sound very good.
 
#38
Hi,

When I mentioned the distortion, I was referring to the high-gain overdrive sound that introduces a lot of harmonic distortion, often used with drop-tuned guitars, the point being that the loudspeakers themselves won't see much in the way of LF fundamentals.

I agree with you that the dipole cabinet (in terms of LF performance) might not be the best thing for the job. The up-side of dipole cabinets is the more expansive sound created by the rear-wave being reflected around.

Chris
 
#39
chris661 said:
Hi,

When I mentioned the distortion, I was referring to the high-gain overdrive sound that introduces a lot of harmonic distortion, often used with drop-tuned guitars, the point being that the loudspeakers themselves won't see much in the way of LF fundamentals.
Chris
Click to expand...

The speakers will certainly see the fundamental of the lowest note played and while this might not be 40ish Hz as with a standard bass, it is low enough given the very low Xmax and high SPL that we are talking about. As I said it is all relative.
 
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