What's the range of the input gain? i'm wondering if it can boost a -10 dbv guitar amp effects loop send up to +4 dbu or thereabouts.

No, the nominal levels for both input and output are +4 dBu, so you will not have any appreciable gain.

these effact machine better than effect build in allen & heat zed10fx ? i'm looking for good effect for my home karaoke . any suggestion . thanks

While the effects in your Allen & Heath are pretty good. The Lexicon is a step up. Plus add the feature of designing your effects and save them for instant recall. It comes in handy. Remember this is a duel engine unit. This allows you the ability to have independent control over two separate effects at one time. It is worth the money. I have used Lexicon effects for decades in high end recording studios. There is a pretty impressive pedigree behind the name...

how long is the usb cable? does it come with one?

It does not come with a USB cable.

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Lexicon MX400XL 4-in/4-out Reverb/Effects Processor with USB "Hardware Plug-In" Capability and XLR

Lexicon MX400XL 4-in/4-out Reverb/Effects Processor with USB "Hardware Plug-In" Capability and XLR

Product ID: 2018401

Details

Brand
Lexicon
Color
Blue
Item Weight
7.8 Pounds
Style
MX400XL
Voltage
230 Volts

💻USB hardware plug-in support

🔊4-in/4-out XLR I/O

🎛️35 legendary Lexicon effects

Description

🎧 Elevate your mix with legendary Lexicon vibes—pro effects, zero compromise!

PLUG PLAY USB INTEGRATION - Effortlessly connect as a hardware plug-in with VST/AU compatibility for DAW workflow freedom.
ICONIC LEXICON SOUND LIBRARY - Access 35 classic reverbs, delays, and dbx dynamics that define pro studio quality.
DUAL STEREO SURROUND MASTERY - Seamlessly blend 4 channels for immersive spatial effects or multi-mono setups.
PRECISION 24 BIT AUDIO CLARITY - Supports 44.1kHz & 48kHz sample rates ensuring pristine, professional-grade sound fidelity.
USER FRIENDLY CONTROL INTERFACE - Intuitive knob and menu system with quick parameter editing—perfect for fast creative flow.

The Lexicon MX400XL is a versatile 4-in/4-out reverb and effects processor featuring 35 iconic Lexicon reverbs, delays, and dynamics. It supports 24-bit/44.1kHz or 48kHz digital audio with USB hardware plug-in capability for seamless DAW integration. Designed for both stereo and surround sound applications, it offers 224 factory presets and an intuitive control interface, making it a top-tier choice for professional and home studios seeking premium effects under $1000.

Specifications

ASIN	B000G304YS
Amperage	300 Milliamps
Audio Output Effects	Surround
Best Sellers Rank	#290,870 in Musical Instruments ( See Top 100 in Musical Instruments ) #42 in Digital Reverb & Delay Effects
Brand Name	Lexicon
Color	Blue
Controls Type	Knob
Customer Reviews	3.9 3.9 out of 5 stars (10)
Global Trade Identification Number	00691991500220
Hardware Interface	USB
Item Dimensions	22.2 x 11.3 x 3.5 inches
Item Type Name	Reverb/Effects Processor
Item Weight	7.8 Pounds
Manufacturer	Harman Music Group
Manufacturer Part Number	LEXMX400XL
Model Name	MX400XL
Model Number	MX400XL
Power Source	Corded Electric
Signal Format	Digital
Style	MX400XL
UPC	886830958168 691991500220
Voltage	230 Volts
Warranty Description	1 year.

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