Is this amp 12v only and not for use with a 110 power source?

Actually it can use 3 different voltages, 12 VDC, 110 AC or 220 AC

The specs say it has a 3.5 mm jack on the front, but I don't see it in the picture. Where is it?

It has 3 one is for head phones. mic one mic two

Will this work by connecting to multiple speakers in a public gathering place?

Yes, multiple speakers can be attached, however there are some rules to follow. 1. The speakers must match the amplifiers output impedance (I'll explain) and 2. You must not exceed the amplifiers power rating...in this case 80 watts.Back to rule 1: For multiple speakers, use the 25Volt or 70Volt output terminations (screws). The speakers must have the ability to be set to either, usually with a movable tap. You can stack, in parallel several speakers...now the 2nd rule comes in. The speakers must also have a movable power tap so you can set the amout of "watts". The total watts of all speakers combined should not exceed 80. For example, if you need to have 4 speakers in your hall or other public gathering placing, they can only be set to a maximum (individually) of 20 watts. In total, then you have an 80 watt load. Remember all the speakers must be either 70v if you're using the 70v tap on the amp, or 25v if you're using the 25v tap on the amp.Good engineering practice says you should leave some "overhead", so if I were doing these 4 speakers, I'd set them for a max of 15 watts (times 4 is 60 watts) leaving 20 watts overhead. Depending on your "room", you may start out by setting them to 10 watts, testing the system for loudness. If you find that that's sufficient, leave it at 10.One other caution...some amplifiers have output "short" protection in the event you accidently short the speaker leads while the amp is on. This one does NOT, so be careful when wiring the speakers...leave the amp off until you're all done....good luck!!

can I connect this amp to a lap top for a live online audio feed?

Yes, just take the computer output from the 1/8 jack, feed that into one of the RCA female plugs on the back of amp, then select the proper input selection on the front of the amp.

ASIN	B000J45H0U
Best Sellers Rank	#23,752 in Electronics ( See Top 100 in Electronics ) #112 in Audio Component Amplifiers
Brand	Pyle
Customer Reviews	4.2 4.2 out of 5 stars (212)
Date First Available	September 26, 2006
Global Trade Identification Number	00068888880220
Is Discontinued By Manufacturer	No
Item Weight	4.43 pounds
Item dimensions L x W x H	11.5 x 4.9 x 15.2 inches
Item model number	PT110
Manufacturer	Sound Around
Material	Iron
Maximum Supply Voltage	70 Volts (DC)
Minimum Supply Voltage	70 Volts (DC)
Mounting Type	Surface Mount
Number of Channels	1
Output Power	80 Watts
Product Dimensions	11.5 x 4.9 x 15.2 inches
Specification Met	certified frustration-free
UPC	068888880220
Voltage	70 Volts

Home Compact Public Address Mono Amplifier - Professional 50W Mini Home Power Audio Sound PA Speaker Receiver System w/RCA, Headphone, 2 Microphone Inputs, Independent Volume Control - PT110

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