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  5. HMX 7.7 S-LD-G.2

HMX 7.7 S-LD-G.2

100 Watt

HMX 7.7 S-LD-G.2

Technical Highlights

  • Continuous power handling: 100 W RMS, Impedance: 4 Ohm, Frequency: 45-25,000 Hz.
  • Peak power handling: 200 W Peak, Chassis size: 7.7 inch, Re: 3.3 Ohm.
  • Resonant frequency: 60 Hz, Voice coil inductance: 0.56 mH, SPL: 91 dB.
  • More technical details
€379.00
€379.00 €379.00
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ProductHMX 7.7 S-LD-G.2

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Estimated delivery: Sep 17–Sep 23.
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datasheet
The Hertz HMX 7.7 S-LD-G.2 is a round black and silver coaxial speaker with blue LED ring, metal grille, and the HERTZ logo at the bottom.
€379.00
€379.00 €379.00

The HMX 7.7 S-LD-SW.2 from Hertz is an 8" (20 cm) coaxial speaker that stands out for its versatile applications and impressive power. Equipped with a 2-way coaxial system, it offers a frequency range of 45 – 25,000 Hz and an impedance of 4 Ohm, allowing you to experience a wide sound spectrum. With a continuous power handling of 100 W RMS and a peak power handling of 200 W Peak, this speaker guarantees reliable and powerful audio playback. The use of neodymium as tweeter material and a reinforced polypropylene diaphragm contributes to the durability and high sound quality of the system. Weighing 1.66 kg, it is also robust and stable.

Technical specifications

  • Model type: 2-way coaxial system
  • Chassis size: 7.7 inches
  • Continuous power handling: 100 W RMS
  • Peak power handling: 200 W Peak
  • Impedance: 4 Ohm
  • Frequency range: 45 – 25,000 Hz
  • Tweeter diameter: 36 mm
  • Mid-bass voice coil diameter: 32 mm
  • Tweeter voice coil diameter: 20 mm
  • Mid-bass magnet material: ferrite (high-density)
  • Tweeter magnet material: neodymium
  • Mid-bass magnet size: 90 x 40 x 20 mm
  • Tweeter magnet size: 19.7 x 3 mm
  • Diaphragm material: polypropylene with UV inhibitors
  • Tweeter dome material: PEI
  • Maximum mechanical excursion (Xmech): +/- 8.5 mm
  • Weight per speaker: 1.66 kg

Electro-acoustic parameters (TSP)

  • Effective diaphragm diameter (D): 146 mm
  • Maximum linear excursion (Xmax): 6 mm
  • DC resistance (Re): 3.3 Ohm
  • Resonance frequency (Fs): 60 Hz
  • Voice coil inductance (Le): 0.56 mH
  • Equivalent volume (Vas): 12.50 l
  • Moving mass (Mms): 22 g
  • Suspension compliance (Cms): 0.32 mm/N
  • Force factor (BL): 6 Tm
  • Total quality (Qts): 0.72
  • Electrical quality (Qes): 0.76
  • Mechanical quality (Qms): 11.8
  • Reference sound pressure level (Spl): 91 dB

Dimensions

Technical side view of the Hertz HMX 7.7 S-LD-G.2 subwoofer with labeled dimensions, ideal for 2-way coaxial or coaxial speaker systems.

  • A    196 mm
  • B    158 mm
  • C    113 mm
  • D    79 mm
  • F    34 mm

Frequency response

The line graph for the Hertz HMX 7.7 S-LD-G.2 shows the sound pressure level dB as a function of frequency Hz with curves for the main axis and the secondary axis, as well as the overlaid impedance for this coaxial speaker.

Frequently Asked Questions about HMX 7.7 S-LD-G.2

What are the performance specifications of the Hertz HMX 7.7 S-LD-G.2 coaxial system?

The Hertz HMX 7.7 S-LD-G.2 is a 2-way coaxial system that offers a continuous power handling of 100 W RMS and a peak power handling of 200 W Peak. It has an impedance of 4 Ohm, which is important for compatibility with most amplifiers. Its frequency range extends from 45 Hz to 25,000 Hz. This bandwidth allows for clear sounds in both low and high frequency ranges. The Tweeter has a diameter of 36 mm and is made of PEI, a material known for its stability at high frequencies. The combination of these technical specifications ensures powerful and high-quality sound output.

How do the Thiele-Small parameters affect the performance of the HMX 7.7 S-LD-G.2 speaker?

The Thiele-Small parameters of the HMX 7.7 S-LD-G.2 include an effective diaphragm diameter (D) of 146 mm and a maximum linear excursion (Xmax) of 6 mm, allowing for a wide range of motion. The DC resistance (Re) is 3.3 Ohm and the resonance frequency (Fs) is 60 Hz, enabling clear and efficient reproduction of the lowest frequencies. The voice coil inductance (Le) is 0.56 mH. These parameters significantly influence the electro-mechanical compatibility and tonal characteristics of the speaker, leading to improved sound quality.

What are the dimensions of the HMX 7.7 S-LD-G.2 system and what should be considered during installation in a car?

The HMX 7.7 S-LD-G.2 from Hertz has a chassis size of 7.7 inches. Important installation dimensions are: A is 196 mm, B is 158 mm, C is 113 mm, D is 79 mm, and F is 34 mm. These dimensions are crucial to ensure the best placement, as the speaker should not have any obstacles nearby for optimal sound. Compatibility with the installation location is critical, as incorrect distances can lead to sound degradation. Another tip is to pay attention to the maximum mechanical excursion of +/- 8.5 mm to avoid damage.

What type of magnet material is used in the HMX 7.7 S-LD-G.2 from Hertz and why is it important?

In the HMX 7.7 S-LD-G.2, different magnetic materials are used: The Mid-woofers use ferrite (High-Density), while the Tweeter is equipped with neodymium. Ferrite is known for its cost-effective and sufficient magnetic properties in woofers. Neodymium, on the other hand, offers high energy density, which is useful for the Tweeter to ensure stable sound reproduction even at high frequencies. The sizes of the magnets are 90 x 40 x 20 mm for the Mid-woofers and 19.7 x 3 mm for the Tweeter. This combination ensures a balanced acoustic experience.

What materials are used for the diaphragm and the Tweeter of the HMX 7.7 S-LD-G.2?

The diaphragm material of the HMX 7.7 S-LD-G.2 is made of polypropylene and is infused with UV inhibitors, which increases resistance to sunlight and thus extends its lifespan. Polypropylene is also known for its stiffness and lightness, allowing for precise and clear sound reproduction. For the Tweeter, PEI is used, a material that offers high thermal and mechanical stability, ensuring that sound quality is maintained even under intense use. Both materials significantly contribute to the overall performance and robustness of the speaker.

What is the frequency response of the HMX 7.7 S-LD-G.2 and what does it mean for sound quality?

The frequency range of the HMX 7.7 S-LD-G.2 extends from 45 Hz to 25,000 Hz, providing broad coverage from bass to high tones and accurately reproducing every note. Such a wide frequency response means that both low and high frequencies can be represented clearly and powerfully, without distortion. With a rated value of 91 dB, it is also capable of achieving high volume levels with low amplifier power. Especially if you enjoy listening to music loudly, you will be impressed by the clarity and balance that this speaker offers.

What are the specific acoustic properties of the HMX 7.7 S-LD-G.2?

The acoustic properties of the HMX 7.7 S-LD-G.2 include a resonance frequency (Fs) of 60 Hz and a nominal sound pressure level (SPL) of 91 dB. These parameters ensure strong bass reproduction and sensitive response to different frequencies without the need for high amplifier levels. The total quality factor (Qts) is 0.72, indicating a good balance between sound pressure and bandwidth. These factors are crucial for achieving a balanced acoustic performance that is felt in both volume and quality.

What is the weight of the HMX 7.7 S-LD-G.2 speaker and why is this important?

A single HMX 7.7 S-LD-G.2 speaker weighs 1.66 kg, which is relatively moderate for 7.7-inch models. The weight plays a role in installation and any necessary mounting fixtures in the vehicle. Lighter speakers can generally be mounted and adjusted more easily, simplifying the customization process. Despite the moderate weight, it does not compromise structural integrity or sound quality. Special materials like the aforementioned ferrite and neodymium help keep the weight optimal while delivering an excellent sound experience.

What tips are there for the perfect placement and setup of the HMX 7.7 S-LD-G.2?

For the flawless sound of the HMX 7.7 S-LD-G.2, correct placement is crucial. Ensure that the speaker has no obstacles in the sound output direction and is in a secure mounting location to minimize vibration losses. Consider the mounting frame size of 196 mm in diameter to ensure the speaker is firmly anchored. The lowest frequencies play evenly when the speaker is mounted on a stable, reflective surface material. A high distance between the diaphragm and nearby objects maximizes acoustic performance sustainably.

Does the HMX 7.7 S-LD-G.2 fit in my vehicle and what should I consider regarding compatibility?

The HMX 7.7 S-LD-G.2 is a 7.7-inch speaker system. When installing the speaker, it should be ensured that the installation depth of 113 mm and the frame size of 196 mm are considered in the vehicle. Imagine accounting for all mounting play, especially in small installation spaces. Additional metal brackets may be required to ensure a secure installation. Since dimensions are crucial for compatibility, each vehicle should be checked beforehand for sufficient space. Also, consider the material compatibility of the vehicle's trim.

Manufacturer information/responsible person

Elettromedia SpA
62018 Potenza Picena (MC)
Strada Regina km 3,500
Italy

Contact person:
Simone Iampieri
Executive Director Assistant
T +39 0733 870 813
Elettromedia SpA
62018 Potenza Picena (MC) Italy
Strada Regina km 3,500
T + 39 0733 870 870

Contact: simone.iampieri@elettromedia.it

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