Amp sounds better at 45 degree angle ...

Minion · 4th January 2012, 10:52 PM

Hi , I built this amp a few months ago and it sounds great accept it sounds best when I stand at a 45 degree angle to the speaker , the closer I move to directly in front of the speaker the more tinny and brittle it sounds , it doesn"t sound bad but just not as good as at 45 degrees .....

So the first question I guess is why ?? (some sort of phaze thing ?? )

Second question is how can I get the sound directly in front of the speaker to sound like it does at a 45 degree angle ??

Thanx

PS: The amp has a solidstate overdrive stage then into two 12ax7 stages (one 12ax7 tube) , then into some analogue speaker simulators , then into 4 12ax7 stages (two 12ax7 tubes) then into a tone stack , then through the effects loop into a BBE sonic maximizer , then into a 15 band EQ and then into a DBX compressor and then into a LM3886 power amp into a 12 inch Celestian 50w speaker ......

pieter t · 4th January 2012, 11:18 PM

Quote:

Originally Posted by Minion

PS: The amp has a solidstate overdrive stage then into two 12ax7 stages (one 12ax7 tube) , then into some analogue speaker simulators , then into 4 12ax7 stages (two 12ax7 tubes) then into a tone stack , then through the effects loop into a BBE sonic maximizer , then into a 15 band EQ and then into a DBX compressor and then into a LM3886 power amp into a 12 inch Celestian 50w speaker ......

Be glad that it puts out a signal

But more seriously, I think it has more to do with the loudspeakers, especially when it is a multi-way; these can have phase issues which depend on listening distance and angle.

Minion · 4th January 2012, 11:43 PM

Quote:

Originally Posted by pieter t

Be glad that it puts out a signal

But more seriously, I think it has more to do with the loudspeakers, especially when it is a multi-way; these can have phase issues which depend on listening distance and angle.

Thanx .... It"s not a multi-way system , just a single guitar speaker .....

godfrey · 5th January 2012, 12:45 AM

Quote:

Originally Posted by Minion

...the closer I move to directly in front of the speaker the more tinny and brittle it sounds , it doesn"t sound bad but just not as good as at 45 degrees ...

I guess most if the treble is being thrown forward. If you equalize it to sound good on axis, then it'll probably sound dull at 45 degrees. Maybe you could mount something directly in front of the cone to soak up some treble or scatter it around?

Trout · 5th January 2012, 12:57 AM

What speaker?

I often find some of the deeper cone angle speakers tend to do this.

Minion · 5th January 2012, 01:01 AM

Its a standard Celestian guitar speaker , it is rebranded as a fender replacement speaker ....... It doesn"t have a covering over the speaker so I"ll try putting a speaker cover over it and see if it dulls down some of the trebble .....

Thanx

Enzo · 5th January 2012, 01:58 AM

Some speakers are just naturally "beamy."

Ted Weber makes the "Beam Blocker" for exactly this.

Weber Beam Blocker -- high frequency diffuser

Minion · 5th January 2012, 02:14 AM

Thanx , thats helpfull , I got some thin memory foam here so maybe I"ll try useing that to dampen the sound ...... Cheers

phase_accurate · 5th January 2012, 06:26 AM

It is normal that a driver that large beams.
If you search around you will find a whole bunch of info about miking of guitar amps for PA or recording where they discuss about the best spot in front of a speaker to place a microphone. And guess what ? There is no such best place because it is a matter of taste.
There was once an article in JAES where thy made masurements with different mic angles and placements in front of a guitar amp and they show remarkable differences in frequency response.

In other words: What you encounter is perfectly normal.

There are different ways to cope with it however:

Listen to it off axis only - this is what needs the least effort. When you practice with a band your mates will most probably hear the off-axis sound only and you will probably be glad to stand on-axis now and then where it has the necessary bite to cut through the rest.

The "anti beaming thingie" can be tried out with other things first to see whether you like it.

And last but not least you could try to correct the frequency response a little within the amp.

You would have to try ount decide what works for you and what you like most.

Regards

Charles

chris661 · 5th January 2012, 07:32 AM

How difficult would it be to DIY a beam blocker?

Ikea bowls, anyone?

4th January 2012, 10:52 PM	#1
Minion diyAudio Member Join Date: May 2006	Amp sounds better at 45 degree angle ... Hi , I built this amp a few months ago and it sounds great accept it sounds best when I stand at a 45 degree angle to the speaker , the closer I move to directly in front of the speaker the more tinny and brittle it sounds , it doesn"t sound bad but just not as good as at 45 degrees ..... So the first question I guess is why ?? (some sort of phaze thing ?? ) Second question is how can I get the sound directly in front of the speaker to sound like it does at a 45 degree angle ?? Thanx PS: The amp has a solidstate overdrive stage then into two 12ax7 stages (one 12ax7 tube) , then into some analogue speaker simulators , then into 4 12ax7 stages (two 12ax7 tubes) then into a tone stack , then through the effects loop into a BBE sonic maximizer , then into a 15 band EQ and then into a DBX compressor and then into a LM3886 power amp into a 12 inch Celestian 50w speaker ......

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5th January 2012, 12:57 AM	#5
Trout diyAudio Member Join Date: Nov 2004 Location: Midwest Madman	What speaker? I often find some of the deeper cone angle speakers tend to do this.

5th January 2012, 01:01 AM	#6
Minion diyAudio Member Join Date: May 2006	Its a standard Celestian guitar speaker , it is rebranded as a fender replacement speaker ....... It doesn"t have a covering over the speaker so I"ll try putting a speaker cover over it and see if it dulls down some of the trebble ..... Thanx

5th January 2012, 02:14 AM	#8
Minion diyAudio Member Join Date: May 2006	Thanx , thats helpfull , I got some thin memory foam here so maybe I"ll try useing that to dampen the sound ...... Cheers

5th January 2012, 06:26 AM	#9
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	It is normal that a driver that large beams. If you search around you will find a whole bunch of info about miking of guitar amps for PA or recording where they discuss about the best spot in front of a speaker to place a microphone. And guess what ? There is no such best place because it is a matter of taste. There was once an article in JAES where thy made masurements with different mic angles and placements in front of a guitar amp and they show remarkable differences in frequency response. In other words: What you encounter is perfectly normal. There are different ways to cope with it however: Listen to it off axis only - this is what needs the least effort. When you practice with a band your mates will most probably hear the off-axis sound only and you will probably be glad to stand on-axis now and then where it has the necessary bite to cut through the rest. The "anti beaming thingie" can be tried out with other things first to see whether you like it. And last but not least you could try to correct the frequency response a little within the amp. You would have to try ount decide what works for you and what you like most. Regards Charles

5th January 2012, 07:32 AM	#10
chris661 diyAudio Member Join Date: Feb 2008 Location: Lancashire Blog Entries: 7	How difficult would it be to DIY a beam blocker? Ikea bowls, anyone?

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