Marcus Miller Z7-4 Natural Swamp Ash LH

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Electric Bass

Left-handed model
Body: Swamp ash
Bolt-on neck: Roasted maple
Fingerboard: Roasted maple
Fingerboard inlays: White dots
Edgeless fingerboard (rounded edges)
Nut: Bone
Neck profile: C
Nut width: 42 mm (1.65")
Fingerboard radius: 305 mm (12")
Scale length: 864 mm (34")
22 stainless steel medium jumbo frets
Pickups: Sire Premium MM humbucker (bridge) and Sire Premium single coil (neck)
Marcus Heritage-3 preamp
Controls: Volume, Tone, Blender, Treble, Middle/Freq, Bass with push/pull function
3-ply pickguard: Black
Sire Premium MM bridge
Chrome-plated hardware
Premium open machine heads
Colour: Natural

30-Day Money-Back Guarantee

3-Year Thomann Warranty

Available since February 2025
Item number 592121
Sales Unit 1 piece(s)
Colour Natural
Body Swamp Ash
Neck Roasted Maple
Fingerboard Roasted Maple
Frets 22
Scale Longscale
Pickup System HJ
Electronics Active
Including Case No
Incl. Gigbag No

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Marcus Miller Z7-4 Natural Swamp Ash LH

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$525

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Sales Rank

in 4-String Lefthanded Basses

2 Customer ratings

5 0 Customers 4 0 Customers 3 1 Customer 2 0 Customers 1 1 Customer

2 / 5

features

sound

quality

Review guidelines

2 Reviews

Fundamentally Flawed

The Raggedy Man 13.07.2026

I have had two of these and both have had to be returned. They both suffered from fret buzz on the E string which no amount of neck relief or string height adjustment could solve. Essentially the neck geometry was out - a fundamental problem! I would hazard a guess the QC in the factory has taken a bit of dip as these have a reputation for being well made. It's put me off the whole Marcus Miller brand to be honest. As a result I can only rate 1 star, in spite of the great sound and features, as it is fundamentally not useable.

Thomann however have been great and have honoured their money back guarantee.

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Good looking bass - poor quality workmanship

CanaryKen 03.07.2026

Thomann are a very good company and the reviews for Sire MM basses is usually very good. The spec/features is great but on this particular bass it has a badly fitting neck to body joint, as there is a noticeable gap at the join. This could be a poorly located neck or maybe too wide a socket routed in the body. Either way, I'm surprised it left the Sire company in this condition. I still have faith in Sire and hope it was a one off, so I've asked Thomann for a replacement rather than a refund.

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Marcus Miller Z7-4 Natural Swamp Ash LH

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