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PostPosted: 26 Feb 2021, 14:03 
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Joined: 26 Feb 2021, 13:38
Posts: 2
I am looking into the concept of a small guitar cabinet using a unusual array of components.

2x4ohm 6" drive units
1x8ohm 6" drive unit
1x Piezo horn (with volume control)

The concept:-
To produce a compact and narrow 8ohm guitar speaker cabinet
To have two forward facing 6" drive units displacing the same air as a traditional 12" with one 6" drive unit enclosed within the cabinet but ported at both sides of the drive unit to the front baffle. The idea of the Piezo horn (tweeters not required or desirable on guitar amps) is for when mp3 music is played through the guitar amp, the treble can be mixed in to suit the venue (in-between sets) to 'cut' in a noisy environment.
The eventual finished cabinet to be connected to a 8ohm output guitar amplifier head

I believe I need to hook up the two 4ohm units in series before attaching the 8ohm driver and tweeter in parallel.
For a volume pot on the tweeter, do I connect it in parallel across the tweeter ?

Am I on the right track ?
and any links to suitable drive units 5 or 6" for this project appreciated. (needs to be good at the midrange power thing - not hifi)

Thanks


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PostPosted: 27 Feb 2021, 16:45 
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Joined: 03 Jun 2020, 11:06
Posts: 118
Location: France
Hi @itsjon,

A drawing of your cab configuration would help, I think...

For the speakers, Jensen offers the MOD 6-15 in 4 and 8R : https://www.jensentone.com/mod-series/mod-6-15

These are inexpensive - at least here in France : https://www.thomann.de/fr/jensen_jch_6154_chicago_4_ohm.htm

For your Piezo tweeter, I would use a constant Z attenuator like the Monacor LP-100-8 for example : https://www.monacor.com/products/components/speaker-technology/diy-/lp-100-8/

Cheers,

_________________
https://guilhemamplification.jimdofree.com/


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PostPosted: 27 Feb 2021, 16:55 
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Joined: 23 Aug 2008, 06:51
Posts: 37
2 x 6" drivers wont move the same amount of air as a 12" driver as the relationship is a square one, proportional to the cone area. Area = pi times radius squared. .
You'll need 4 x 6" drivers to approximate the same air movement.


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PostPosted: 27 Feb 2021, 20:43 
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Joined: 26 Feb 2021, 13:38
Posts: 2
itsjon wrote:
I am looking into the concept of a small guitar cabinet using a unusual array of components.

2x4ohm 6" drive units
1x8ohm 6" drive unit
1x Piezo horn (with volume control)

The concept:-
To produce a compact and narrow 8ohm guitar speaker cabinet
To have two forward facing 6" drive units displacing the same air as a traditional 12" with one 6" drive unit enclosed within the cabinet but ported at both sides of the drive unit to the front baffle. The idea of the Piezo horn (tweeters not required or desirable on guitar amps) is for when mp3 music is played through the guitar amp, the treble can be mixed in to suit the venue (in-between sets) to 'cut' in a noisy environment.
The eventual finished cabinet to be connected to a 8ohm output guitar amplifier head

I believe I need to hook up the two 4ohm units in series before attaching the 8ohm driver and tweeter in parallel.
For a volume pot on the tweeter, do I connect it in parallel across the tweeter ?

Am I on the right track ?
and any links to suitable drive units 5 or 6" for this project appreciated. (needs to be good at the midrange power thing - not hifi)

Thanks


Thanks guys..

I'm thinking of this Piezo https://www.thomann.de/gb/cts_ksn1177.htm
and this is the amp that inspired the idea https://www.thomann.de/gb/joyo_zombie.htm
As Piezo's are rough and high output = rear facing and dial in the volume to suit taste/venue

Here is my idea.. 8ohm in bandpass with twin 4ohm forward facing.
No Crossover but constant Z attenuator on the tweeter
Its just about moving air, not recreating hifi accurately in this case.
It will be interesting to find out how the pressure behind the front drivers changes the guitar tone (or not)

Hows it looking up to now ? feasible ?

Image


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