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Old 8th March 2011, 02:32 AM   #1
diyAudio Member
Join Date: Nov 2010
Question Speaker Cabinet

Hello to all.

I am getting a Line 6 Spider IV HD150 150W Guitar Amp Head, which i heat is a great modeling amp. And i want to build the cabinet for this amp to save money.

First question. How many speakers can it take, half stack, or full.

second, For what i am doing, what speakers should i use.
recomandations please. Details:
i am doing light gigging, using for recording and use in the home.
using drop tunings as low as drop C
want a darker kind of sound, like low ends.

Third, open back or closed, or even vented? For what i am doing, what is best??

Fourth, how should the speakers be wired. I dont have a firm understanding in the impendance of speakers. so help me please.

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Old 8th March 2011, 03:08 AM   #2
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Join Date: Apr 2007
Great questions !
The speakers are produced in 4 ,8 or 16 Ohm impedance ,so-called nominal because it changes when a musical signal is applied to speaker's terminals .
Amplifiers are targeted to reach a certain power under a certain load . And they like to distort on lower impedance loads ,which is no good -it's not the same 'overload distortion' made by saturating the inputs ,it just cooks the power devices . So to mantain a certain load seen by the amplifier , speakers can be series or parallel connected ,if four ,they can be paralleled in pairs then series to another paralleled pair . Note that we're using the same speaker .
So the equation of paralleled resistances (which speakers are not ,but impedance sum and divide as resistance ) is simplified : when two 8 Ohm speakers are paralleled ,total impedance would be 4 Ohm . In series = 16 Ohm
Series-parallel ( 4 drivers)= 8 Ohm
The choice of type of cabinet ,open ,vented or closed depends from speaker's characteristcs (parameters ) and from what you prefer most .
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Old 8th March 2011, 03:14 AM   #3
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Thanks for the quick reply. So, if an amp, say, had a speaker cap of two 8 Ohm speakers in series, it could handle eight speakers in the series-parallel? Is the bigger the speaker best for the low range sound reproduction of a guitar??
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Old 8th March 2011, 03:25 AM   #4
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When talking about speakers and sound ,we talk about compromises . And good sense.
An amplifier is able to control a single thin wire immersed in a magnetic flux ,which may seem strange, but it isn't ,since loudspeakers are very inefficient devices . that because they have a certain mass attached to the voice coil former ,and an inner and a surround retention spring to keep it operating . they are called mechanical and electrical 'friction' .
.....More to come

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Old 8th March 2011, 03:38 AM   #5
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So would i be able to use a full stack? It is stereo, does that mean that i could put cabs on either side of the stage??
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Old 8th March 2011, 04:02 AM   #6
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Well- good news !!!
When putting two drivers aside ,output increases by +3 dB(doubles).
If they are parallel connected ,current flows 1/2 in each ,so you'll have to turn the knob to have more volume . no energy is lost ,no energy is created .
Amplifier power in Watts is dictated by its transformer size , efficiency being arguable in the 70 % range if it operates in class AB .
Sorry but I suffer from hi-fi addiction ,where driver sensibility is in the 85-95 dB/W/m range . 95 dB for me is very high (relatively) sensibility ; it means that when delivered 1 Watt ,it produces a sound 95 db loud ,measured at 1 m.
So if you take a look at the listings of various manufactures , you'll be likely to choose from the 'Pro' audio stuff ,which are almost all high sensibility speakers.
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Old 8th March 2011, 04:49 AM   #7
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It is a 150 watt amp with stereo channel output. I just have trouble finding the impendance output. I hear it works with a halfstack, but i dont know how it is wired, so i have no idea on impendance
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Old 8th March 2011, 06:28 AM   #8
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Location: Sheffield
Almost everything with a solid state amplifier will drive 8ohms comfortably. Most will drive 4ohms, but a lower impedance increases the current draw from the amplifier, putting everything under more stress.

I would say 8ohms per channel would be okay, unless someone finds a spec sheet.
Yes, you can operate a full stack. For each cabinet, buy 4 drivers, 8ohms each. When you wire two of these in series, the impedance goes to 16ohm. When you put two of these groups in parallel, it's back to 8ohm (per cabinet), which your amplifier should be happy with.

My work: www.grimshawaudio.com
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