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 kg
Mounting Type
Chassis Mount
Power Source
Corded
Specification Met
UL

🔇Passive isolation eliminates hum & noise

🔌Multi-format I/O: XLR, TRS, RCA

🎚️10Hz-50kHz ultra-wide freq response

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Description

🎧 Elevate your sound—silence the hum, amplify your clarity!

HIGH SIGNAL INTEGRITY - Extremely low distortion (.01% THD at 1kHz) ensures your audio remains pure and uncolored at all levels.
ROBUST PASSIVE DESIGN - No power needed—totally passive operation means zero interference and rock-solid reliability on stage or in studio.
VERSATILE CONNECTIVITY - Supports balanced XLR, unbalanced 1/4” TRS, and RCA inputs/outputs for seamless integration with any pro setup.
ULTRA WIDE FREQUENCY RANGE - Handles 10Hz to 50kHz with ±0.5dB accuracy, capturing every sonic detail from sub-bass to shimmering highs.
CRYSTAL CLEAR AUDIO ISOLATION - Dual transformers fully separate grounds to eradicate hum and ground-loop noise for pristine sound.

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 of 10Hz to 50kHz and extremely low distortion, it delivers clean, neutral sound across balanced and unbalanced connections (XLR, TRS, RCA). Ideal for professional audio setups demanding flawless signal integrity without power dependency.

Specifications

ASIN	B0009GUOQA
Best Sellers Rank	#38,491 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Audio Transformers
Brand Name	ART
Customer Reviews	3.8 3.8 out of 5 stars (303)
Global Trade Identification Number	00840402016380
Item Type Name	ART DTI Dual Transformer Isolator Hum Eliminator
Item Weight	0.34 kg
Manufacturer	ART
Maximum Frequency	50 KHz
Minimum Frequency	10 hertz
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 Count
Warranty Description	1 year.

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€ 95.78

Duties & taxes included

In stock

Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Ireland.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Received my product in pristine condition. Great service overall.

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