I just realised how little I know about amps.

Pickups, pedals, amps, cabs, combos

Moderated By: mods

User avatar
ekwatts
A series of tubes
Posts: 24579
Joined: Tue Apr 18, 2006 10:35 pm
Location: Bongchester

I just realised how little I know about amps.

Post by ekwatts »

Never thought about an extension speaker before as I've only ever plugged into a single cab, if I've ever even used an amp head before anyway.

http://www.thomann.de/gb/harley_benton_ga15.htm

This amp has a "line out". With an extra speaker cab, would that allow me to split the sound between the 10" speaker on the combo and the speaker in the extension cab?

Where do ohms come into it?
Image
Brandon W wrote:you elites.
User avatar
cobascis
.
.
Posts: 3831
Joined: Sat Jun 21, 2008 4:31 pm

Post by cobascis »

I'm no expert, but im 90 percent sure that line out just means you can plug that into a powered speaker or a computer to record. It won't power a cab.
User avatar
hotrodperlmutter
crescent fresh
Posts: 16665
Joined: Sat Apr 04, 2009 10:29 pm
Location: Overland Park, KS, USA

Post by hotrodperlmutter »

here's how i did it with my pathfinders:

i have a pathfinder combo with an 8" speaker, and a head & 2x8" cab version. i wanted to have 3 8" speakers, but running the line out to the cab produced little in the way of usable volume... so i ran the line out to an art tube preamp, and then into the cab. works fine. sounds really warm, and all speakers are approximately the same volume.

dunno if it will work for everything, but it worked for me.
dots wrote:fuck that guy in his bunkhole.
User avatar
filtercap
.
.
Posts: 493
Joined: Tue Oct 10, 2006 3:51 am
Location: the information coalmine

Post by filtercap »

A "line out" jack puts out a "line level" signal roughly similar to what you'd get straight out of an electric guitar, or from the out jack on a home stereo component like a CD changer. It's intended to feed some other bit of equipment such as a mixer, amp, stomp box, recording interface, etc. It isn't intended to drive a speaker; you need to add some sort of power amp to do that.

The 4/8/16 ohm speaker jack is what you want to use for more speakers; it isn't clear whether plugging into this cuts out the internal speaker though.

An amp is maximized by design to drive a speaker load of a particular ohmage, or a range of ohmages such as 4 to 16 ohms in this case. Attaching the amp to a speaker load of greater or lesser ohmage may reduce the amp's output power and/or reduce its frequency range and/or damage the amp's output section.

You can wire up speakers in series, in parallel, or a combination of the two, to achieve one of the ohmages that the amp uses. If wiring in series, just add the ohmages together, such as 8 ohms + 8 ohms = a 16-ohm total load. If wiring in parallel you sometimes divide, so that two 8-ohm speakers in parallel = a 4-ohm load, two 16-ohm speakers in parallel = an 8-ohm load, and so on.

You can take two pairs of series-wired speakers and connect the pairs in parallel. For example, two 8-ohm speakers in series make a 16-ohm load. Wire two such 16-ohm loads in parallel, and you have an 8-ohm total load for a 4-speaker system.

If you have, say, one 8-ohm speaker and one 16-ohm speaker, the formula gets a little trickier if they're in parallel. In this case, the speakers are unlikely to divide the job evenly. So it's best to have all the speakers rated at the same number of ohms.
Bill Oakley
.
.
Posts: 334
Joined: Sat Sep 26, 2009 6:16 am
Location: Kennewick, WA
Contact:

Post by Bill Oakley »

^ Well said. Basically , if you had two of these amps, you could hook up the line out of the one you have your guitar plugged into to the input of the second amp giving you a pseudo mini stack kind of thing. I did this years ago and it can be pretty nice. I used 2 different brand amps and got a really nice sound. It was like having a speaker cabinet with tone and volume controls.