Two Marshall speakers for better stereo?

crutschow

Joined Mar 14, 2008
38,593
I just read that the speaker box has separate amps for the left and right speakers (below), so that's why they suggested running both signals to each box, otherwise you would be using only half the speakers.
So if you do get an additional speaker, you could connect both channels of each speaker to it's respective left or right signal, thus using all the speakers for each channel.
That will require a mono to stereo adapter plug (example) at the input to each speaker.

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nsaspook

Joined Aug 27, 2009
16,372
I just read that the speaker box has separate amps for the left and right speakers (below), so that's why they suggested running both signals to each box, otherwise you would be using only half the speakers.
So if you do get an additional speaker, you could connect both channels of each speaker to it's respective left or right signal, thus using all the speakers for each channel.
That will require a mono to stereo adapter plug (example) at the input to each speaker.

View attachment 347644
No wonder he wants another. Those power levels are minimal. Just a little more than cheap boombox levels.
He's needs some real power for clean and loud sound.
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Thread Starter

hexreader

Joined Apr 16, 2011
619
(nsaspook)
No wonder he wants another. Those power levels are minimal. Just a little more than cheap boombox levels.
He's needs some real power for clean and loud sound.
Yes... that's it!
Can I get clean and loud sound for a budget of £1000 to £2000?

Source is punk/metal stereo at normal line levels. Best test is Blue Monday first few seconds with drums.
I can boost levels using Utramizer Pro that looks just like your Destroyer Pro. That is how I currently drive my headphones beyond safe levels.
 
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Thread Starter

hexreader

Joined Apr 16, 2011
619
A big thank you to everyone. I Achieved near perfection (for me) in the end.
Required patch panels and bespoke cabling - well within my skill level.

1) for normal use - I bought a second Acton 3 Marshall speaker to give good stereo separation (against Marshall advice)
Left Acton 3 has both channels wired to left PC output
Right Acton 3 has both channels wired to right PC output
Woburn 3 sits in the centre with volume adjusted to match the two Acton's
Down - side is that I must sit in central position - luckily not a problem for me - no good for others

2a) for loudness, normal configuration as above strangely gives way louder output from smaller Acton speakers then from the bigger Woburn 3 - solution is to feed Woburn 3 through Behringer Ultramizer Pro amplifier. Stupidly loud output without much distortion. Tried it once, but never again due to desire to get along with the neighbours.

2b) for sensible drunken, loud listening, I use Marshall Major 5 headphones, wired rather than Bluetooth. Sensibly loud, but not stupidly loud as I would actually want.

Disclaimer - this is all within a terrible man-cave lab environment - far removed from an ideal sound stage - suits me with 66 year-old tin ear, nobody needs to agree.

I have no affiliation with Marshall, just happen to like the sound, the memories and the art. I fully understand that 50% of what I paid is for the look, and the Marshall logo, and I am fine with that :)
 
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MisterBill2

Joined Jan 23, 2018
27,781
Oh Wow!!! "Marshal Sound"!!! I gave a friend a Marshall guitar amp (tube type) that had been given to me as "non-repairable", and he simply rebuilt the first three stages to the original circuit, with new parts. He LOVES IT!! "Totally the Marshal Sound", whatever that is. So somewhere they have got it right, at least for some folks.
BUT as for those single-unit stereo speakers, single-point stereo does not make sense. That is like the add for a wide-screen TV that has "giant 2 inch woofers" for super bass reproduction. I don't think so!
If the TS lived nearby I would make them a great deal on an excess "Seismic Bass" subwoofer package. But shipping to the UK will not work. Not from 48067.
 

Thread Starter

hexreader

Joined Apr 16, 2011
619
Oh Wow!!! "Marshal Sound"!!! I gave a friend a Marshall guitar amp (tube type) that had been given to me as "non-repairable", and he simply rebuilt the first three stages to the original circuit, with new parts. He LOVES IT!! "Totally the Marshal Sound", whatever that is. So somewhere they have got it right, at least for some folks.
BUT as for those single-unit stereo speakers, single-point stereo does not make sense. That is like the add for a wide-screen TV that has "giant 2 inch woofers" for super bass reproduction. I don't think so!
If the TS lived nearby I would make them a great deal on an excess "Seismic Bass" subwoofer package. But shipping to the UK will not work. Not from 48067.
I will be your friend if you want to give me/sell me a broken Marshall amp :) Promise to fix it and love it
Bought Marshall fridge/freezer, which is coolest thing ever (pun intended), but sound is hopeless, as might be expected from just a fridge.:(

Update for anyone who cares and is not yet asleep:-
I now have Behringer VQ1800D Subwoofer. Only goes down to 40Hz, but stupidly big and loud for only £260
Want frequency down to 20Hz, but £2000 for Klipsch is too much money

Removed electronics from rear to get view of speaker - 300W continuous, 1200W peak
Speaker claims 500W, but no indication if RMS Watts or hopeful watts. Seems to be sufficient just the same.

New question please:
How do I make the powered subwoofer speaker give crazy "punch" for drums?
Prolonged low frequency floor shake is easy, but massive chest pounding "hit" seems harder, despite small room size
Tools available are AWG Function generators, Graphic EQU FBH6200HD with Sub output, Ultramizer pro, mixers, youtube Bass test videos, other stuff

Not sure what I am asking, but all thoughts gratefully received. Very happy with help already received.
Sound system is near perfect for me, but still missing "punch" or "kick"
Thanks
 
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Thread Starter

hexreader

Joined Apr 16, 2011
619
Marshall Fridge - posing for the camera - all fake

Yes, I need a checkup from the neck up. Don't bother telling me

Marshall.jpg
 

crutschow

Joined Mar 14, 2008
38,593
How do I make the powered subwoofer speaker give crazy "punch" for drums?
Prolonged low frequency floor shake is easy, but massive chest pounding "hit" seems harder, despite small room size
What happens if you turn up the sub gain?
Does the speaker distort?
 

Thread Starter

hexreader

Joined Apr 16, 2011
619
What happens if you turn up the sub gain?
Does the speaker distort?
Floor shakes more. Wine glass moves itself across work-bench, but still no "punch/hit"
No obvious audio distortion - which is nice. No clear speaker displacement

Removed grill over speaker for clearer view - not much visible
One (and only one) youtube extreme bass test video somehow gives "punch", and speaker movement is big and obvious
I want to give visible speaker movement and "punch" for average youtube music videos that contain heavy drums
Subwoofer frequency cut set to highest frequency of 200Hz in the hope of catching the "punch"

Thanks for replying to unclear request :)
 
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crutschow

Joined Mar 14, 2008
38,593
Subwoofer frequency cut set to highest frequency of 200Hz in the hope of catching the "punch"
Perhaps the sub doesn't have good transient response to the drum kick.
Some ported subs sacrifice good transient response to get maximum bass volume.
As an experiment you could try plugging the port (if it has one) to see if that makes a difference.
I have a small, inexpensive sub that I use with my computer speakers, and plugging the port of an old sock greatly improved its sound, which was kind of muddy otherwise.

Perhaps your could add a bandpass peak filter to amplify the drum frequencies.
Is that feasible for you?
 
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Thread Starter

hexreader

Joined Apr 16, 2011
619
Seems like you would have to add a bandpass peak filter to amplify the drum frequencies.
Is that feasible for you?
I have 2x31 Graphic equaliser. All the gear and no idea
Subwoofer comes with boost frequency option with tunable frequency to boost. Is that the same thing as bandpass peak filter?
Messed with turning boost frequency on, with turning the dial low to high, but sounds worse, and still no punch

Not sure that the punch/kick that I seek has a particular frequency
Maybe it is the source that gives punch, and maybe a source with no punch cannot be manipulated to give punch.

Sound engineer seems like an easy job, but maybe it is way beyond a newbie like me :)
Almost ready to settle for near-perfect. I feel privileged to have that much

Will spend money on more audio gear if it might help
Still feel like I don't know what I am talking about :(
 

Thread Starter

hexreader

Joined Apr 16, 2011
619
So does your sub have a port?
Not sure if I understand the question

PA Sub accepts full range input and has its own adjustable crossover 40 to 200 Hz to route stereo input to mono sub-bass internal speaker

It can provide provide full range output to XLR through connectors, or input minus sub frequencies to forward outputs. None of this is used or relevant. I use full range XLR Subwoofer inputs only, leaving Subwoofer to select low frequency crossover for itself

Sub dial set for 200Hz - highest setting available

I have equaliser, ultramizer, ultradyne, available to modify the audio, plus boost frequency option on subwoofer. All Behringer

Will buy medium price sound conditioning gadget if recommended or needed

Equaliser has a sub output, but I do not use it

Many thanks
 
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crutschow

Joined Mar 14, 2008
38,593
Not sure if I understand the question
It is a physical port (opening) in the sub cabinet which increases the output volume, but can reduce the transient response and make the bass sound somewhat muddy or boomy.
It works well if you want maximum volume for rock music or movie sound effects, but not so good if you want accurate music bass sound.
It can be in the form of a tube into the cabinet.
It may be behind the speaker grill.
 
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