Is it possible to use two sets of outputs - as in run the XLR outputs to the house PA and run the line outs to a keyboard amp so band can monitor?

Yes, the input signal, regardless of connector used, is present on all outputs. http://artproaudio.com/downloads/specsheets/ss_dti.pdf

does it have a ground "lift" option, switchable?

No "BUT" all outputs are ground isolated from the chassis so a "lift" switch is not necessary when using this.

I want to use my studio monitors with my Macbook Pro. What cable do I need to use to plug this into my laptop?

Hi Jason,I would use an 1/8" to XLR Male Y cable like this:http://www.amazon.com/Hosa-CYX-403M-Stereo-Breakout-Cable/dp/B000068OEP/ref=sr_1_9?m=A3QYKZ7LXW9O3&s=merchant-items&ie=UTF8&qid=1448889739&sr=1-9&keywords=hosa+1%2F8+to+xlrIf this was helpful, please consider purchasing from us. We have them both in stock and ready to ship. - Pixel Pro Audio

My single coil pups are picking up interference (nearby laptop, etc) and causing my amp to hum and click; higher gain makes it worse. will this work?

You need a ground loop isolator. Some are as cheap as $20

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ART DTI Dual Transformer Isolator Hum Eliminator

ART DTI Dual Transformer Isolator Hum Eliminator

Product ID: 3498040

Details

Brand
ART
Item Weight
0.34 Kilograms
Mounting Type
Chassis Mount
Power Source
Corded
Specification Met
UL

🎧10Hz-50kHz ultra-wide freq response

🔇Passive isolation eliminates hum & noise

🔌Multi-format I/O: XLR, TRS, RCA

R$1270

Duties & taxes included

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎛️ Elevate your sound—ditch the hum, keep the vibe!

ROBUST PASSIVE DESIGN - No power needed—totally passive operation ensures zero signal coloration and reliable performance under any conditions.
VERSATILE CONNECTIVITY - Seamlessly connect with balanced XLR, unbalanced 1/4” TRS, and RCA inputs/outputs to fit any studio or live setup.
OPTIMIZED FOR PRO AUDIO - Handles high signal levels with minimal distortion (THD 0.01% typical), perfect for demanding audio environments.
HUM FREE SIGNAL ISOLATION - Dual transformers fully isolate input and output grounds, eradicating ground-loop hum and noise for professional-grade audio purity.
CRYSTAL CLEAR AUDIO FIDELITY - Experience ultra-flat frequency response from 10Hz to 50kHz with less than ±0.5dB variance for pristine sound clarity.

The ART DTI Dual Transformer Isolator Hum Eliminator is a premium passive audio interface designed to eliminate ground-loop noise by isolating input and output grounds via high-performance transformers. With an ultra-wide frequency response (10Hz-50kHz), minimal distortion, and versatile XLR, TRS, and RCA connectivity, it delivers clean, neutral sound for professional audio setups without requiring power.

Specifications

ASIN	B0009GUOQA
Best Sellers Rank	#51,935 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Audio Transformers
Brand	ART
Brand Name	ART
Customer Reviews	3.8 out of 5 stars 300 Reviews
Global Trade Identification Number	00840402016380
Item Type Name	ART DTI Dual Transformer Isolator Hum Eliminator
Item Weight	0.34 Kilograms
Manufacturer	ART
Minimum Frequency	10 Hz
Model	DTI
Mounting Type	Chassis Mount
Number of Items	1
Part Number	DTI
Power Source	Corded Electric
Specification Met	UL
UPC	840402016380
Unit Count	1.0 Count
Warranty Description	1 year.

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