If you want over-ear headphones for studying in a noisy room, choose Superlux HD661; if you need compact, wired in-ear listening with interchangeable plugs, choose SIVGA Que UTG HiFi. For a desk-based study setup, I’d lean toward the Superlux’s enclosed design and two cable lengths; the SIVGA makes more sense when an in-ear fit and a detachable cable matter more.
Superlux HD661 vs SIVGA Que UTG HiFi at a Glance
• SIVGA Que UTG HiFi: An in-ear wired model with a detachable cable, 3.5 mm and 4.4 mm plugs, and a 32-ohm impedance; it has no wireless connection or listed noise-control feature.
• Choose the Superlux if you want an enclosed headphone for monitoring or focused desk listening, plus short and long cable options.
• Choose the SIVGA if you prefer an in-ear shape, around-ear cable routing, and the option to switch between its included plug formats.
• For studying: Superlux suits a stationary setup; SIVGA suits someone who prioritizes a smaller in-ear form over an over-ear headphone.
The HD661 is an enclosed over-ear headphone built around a 40 mm dynamic driver with a neodymium magnet. Its stated frequency band runs from 10 Hz to 20,000 Hz, and its sensitivity is 102 dB SPL at 1 mW at 1 kHz. Those numbers describe its design and specifications, but they do not, on their own, guarantee that every listener will hear the same tonal balance or detail.
The enclosed construction is the clearest practical distinction here. Superlux describes the airtight design as suitable for areas with high external noise, as well as live monitoring, studio work, and broadcast use. For studying, that makes it a reasonable candidate if you want an over-ear headphone for a desk, especially when your listening setup is also used for recording or monitoring. It is wired, with a 3.5 mm connection, and the included 1 m and 3 m cables give you different lengths for a close-up device or a setup farther away. A 6.3 mm conversion plug is included as well.
The trade-off is that the HD661 is not a compact in-ear option, and the listed connection is wired rather than Bluetooth. Its 68-ohm impedance is also worth considering when matching it with the source you plan to use; the sheet does not specify compatibility or performance with particular devices. The box includes a carrying pouch and a cable loss clip, but those accessories do not change its basic role as a wired over-ear monitor.
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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-20 · 7 min read · Independent comparison
SIVGA Que UTG HiFi: Who It's For
The Que UTG HiFi is a wired in-ear monitor with a dynamic driver and a flat glass diaphragm. SIVGA describes the diaphragm as light and rigid, with low damping; the stated design aim is to limit unwanted diaphragm vibration and support precise signal reproduction. The listed frequency range is 20 Hz to 20,000 Hz, sensitivity is 103 dB, and impedance is 32 ohms. These figures help identify the product’s specifications, but they are not a substitute for an individual listening preference.
Its housing combines green sandalwood with a zinc-alloy cavity. SIVGA says the materials and construction are intended to reduce unwanted vibration and cavity resonance. The ear pieces are shaped using 3D ear-contour data, and the cable routes over the ears for stability and reduced microphonic effects. That makes the Que UTG a relevant option for someone who prefers in-ear listening and values a shaped fit and cable management. The cable is detachable and uses silver-plated oxygen-free copper in a 49-strand Litz braid. Both 3.5 mm and 4.4 mm plugs are included and can be switched, so the connection format is more adaptable than a single fixed plug.
The main trade-off is straightforward: this is a wired in-ear product, not a Bluetooth or true wireless model. Its listed noise control is “None,” so I would not choose it on the assumption that it provides active noise cancellation. The sheet also does not list a carrying pouch or a wireless charging feature. SIVGA specifies a 12-month warranty, but that does not change the basic fit and connection considerations.
Who should skip it: Skip the Que UTG if you want an over-ear enclosed headphone or need a wireless connection for studying.
• For an enclosed over-ear design → Superlux HD661. Its construction is the better match if you prefer headphones that sit over the ears rather than in them.
• For an in-ear fit → SIVGA Que UTG HiFi. Its earpieces are shaped around ear-contour data, with the cable routed over the ears.
• For two cable lengths included → Superlux HD661. The package includes 1 m and 3 m cables, plus a cable loss clip and carrying pouch.
• For interchangeable 3.5 mm and 4.4 mm plugs → SIVGA Que UTG HiFi. Its cable supports both included plug formats, which can be swapped.
• For a detachable cable → SIVGA Que UTG HiFi. The cable can be disconnected, and SIVGA identifies cable upgrading as a use case.
• For a stated 10 Hz lower frequency limit → Superlux HD661. Its specified range begins lower than the SIVGA’s listed 20 Hz limit; that specification alone does not establish which one will sound better.
• For a wired study setup with a longer reach → Superlux HD661. The 3 m cable may be useful if your listening position is farther from the audio source.
• For a compact in-ear alternative to over-ear headphones → SIVGA Que UTG HiFi. It is the clear choice if the in-ear form is the priority, though it remains wired.
Buying Considerations
First, decide which fit you are comfortable wearing while you study. The HD661 is an enclosed over-ear headphone, while the Que UTG is an in-ear monitor with an around-ear cable route. Those are not interchangeable styles. A listener who likes over-ear headphones may find the Superlux’s format more suitable for a long desk session; someone who prefers in-ear earpieces may favor the SIVGA’s shape. The provided specifications do not give a direct measure of comfort for every person, so fit preference is a real deciding factor.
Noise handling is another point to keep clear. Superlux describes the HD661’s airtight enclosure as useful in areas with high external noise. The SIVGA’s listed noise control is “None.” That does not establish how either product will perform in every room, and it does not make the Superlux an active-noise-cancelling headphone. If your requirement is active noise cancellation, neither sheet provides a basis for choosing one on that feature.
Finally, do not treat sensitivity, impedance, or frequency range as a complete sound-quality verdict. The Superlux lists 68 ohms and 102 dB SPL at 1 mW at 1 kHz; the SIVGA lists 32 ohms and 103 dB sensitivity. Their driver designs and fits also differ. Those facts can help you compare the products, but they do not say which sound signature you will prefer. For a decision centered on studying, I’d prioritize the fit, cable arrangement, and connection options first.
I’d choose the Superlux HD661 for studying at a desk because its enclosed over-ear design, two cable lengths, and included conversion plug suit a stationary wired setup. The SIVGA Que UTG HiFi is the stronger fit if I wanted in-ear earpieces, a detachable cable, and interchangeable plug options. Neither is wireless, so I would not describe either as a match for someone specifically seeking the best wireless Bluetooth earbuds for studying. My pick is the Superlux, provided an over-ear fit and a wired connection are what I want.
FAQ
The HD661 is the more direct fit based on the available description: Superlux identifies its enclosed, airtight design as suitable for areas with high external noise. The SIVGA’s listed noise control is “None,” and neither product is specified here as having active noise cancellation.
The SIVGA includes interchangeable 3.5 mm and 4.4 mm plugs. The Superlux includes a 3.5 mm-to-6.3 mm conversion plug, not a listed 4.4 mm plug.
No. Neither product is described as foldable, sports-focused, or wireless. The Superlux is an enclosed over-ear headphone, while the SIVGA is a wired in-ear monitor with an around-ear cable route.
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