Hertz There Be Monsters
One of the reasons I love car audio is those products so sexy they need the use of names, not numbers.
How about “SPL Monster”? Well, Hertz, an outfit so known for their love of both serious quality and proper ugly heavy bass have produced an amp truly derving of the ‘Pure sex on a 12V battery’ label.
Caught up with at Car Audio Security in Hayes and modelled by CAS man and Ice Lifer Reno Rosato and “Uncle Fester”, we see the twelve inch SPL Monster subwoofer, which has a removeable, field-serviceable cone and coil assembly of astonishing heavy duty construction and the SPL Monster amplifier.
Note the dual sets of one over gauge power and earth cables festooning out the flank. The amp is a genuine single-chassis item (unlike the monster Earthquake, which is two in one box) running class D.
Here’s what Elettromedia have to say about it:
SPL Monster: extreme pressure and power
Undeniably powerful, devastatingly robust, the new Hertz SPL Monster product range from the monstrous minds of the Elettromedia R&D department. These new products will soon be annihilating the competition at SPL events near you! The Elettromedia R&D experience, combined with the use of the most advanced technologies enabled the Hertz team to build subwoofers and amplifiers with explosive SPL performance; created to dominate in competition. The Hertz SPL Monster line features three products: the MP 15K UNLIMITED, an amplifier able to deliver over 15,000w of power; the M 12 UNLIMITED and M 15 UNLIMITED, customisable subwoofers with four optional mobile assemblies designed to achieve the best results in any application. In order to make the unique SPL Project a reference, our team of designers created a system where a full synergy exists between the amplifier and subwoofer; the combination capable of delivering staggering performance.
The Hertz MP 15K UNLIMITED can deliver over 15,000w. The enormity of this project amazes; both in terms of the physical size of the product itself and of the sheer energy it generates! Within its electronics product range, the SPL MONSTER line offers a main board which is ahead of the time in the SPL amplifier market. Elettromedia decided to develop and manufacture the MP 15K UNLIMITED amplifier in partnership with an outsourced, highly qualified production unit, thus eliminating the low production run limit that penalises the evolution of unique products such as this.
When compared to other companies who have acquired similar technology, the Hertz project boasts special features and extensive enhancements which distinguishes itself. Among them, uninterrupted power supply transfer and an input circuit specifically designed for SPL competitions, featuring integrated Hi-Pass and Lo-Pass filters. A unique power supply connection system, Direct Current, transfers power between the battery and amplifier with very low contact resistance. Four 1/0 AWG cables (2 for the positive and 2 for the negative) are terminated with ring terminals on the supply side and secured to the amplifier with four 2.5 mm thick copper buss bars connected directly to the printed circuit board. This differs completely from the high resistance terminal blocks found on traditional amplifiers that when are called upon to pass high current, generate heat and high power loss. Direct Current is fundamental to achieve the current transfer required for high SPL systems.
In order to deliver such extraordinarily high power, the power supply stage features eight toroidal transformers, twenty 3300uF, 105° Low ESR primary capacitors for a total of 66 000uF; Thirty-two 160A TO247 Mosfets and ten 820uf secondary capacitors capable of 200V. The output stage, settable in bridged or stereo mode, features twenty 190A/360V impulsive current Mosfets: solid, robust power and thermal dissipation without compromise.
For extreme SPL professionals, the MP 15K UNLIMITED is the ideal choice as a foundation to create a system that will achieve new records.
The Hertz SPL Stack System provides the ability to stack multiple MP 15K UNLIMITED amplifiers, using the supplied 2mm thick robust iron brackets. These six brackets are secured to each amplifier via threaded mounting points directly on the heatsink, providing solid integrity. With the Hertz SPL Stack System your system can deliver 15,000w, 30,000w, 45,000w, or more, just stack and connect!
The M 12 UNLIMITED and M 15 UNLIMITED subwoofers are designed for true SPL competitors and their valuable Teams. The sole mission of SPL subwoofers offered to date has been to “burp” huge SPL numbers. Hertz SPL UNLIMTED subwoofers “out-burp” the competition, yet still play music. Just like in Formula 1 racing where the best Teams have the “perfect set-up” ready to go to achieve the best performance on each individual race circuit, the M 12 UNLIMITED and M 15 UNLIMITED offer the ability to choose the moving assembly which is most appropriate for the overall system design and conditions, achieving maximum SPL in every competition. The innovative RMA (Removable Moving Assembly) provides the ability to replace the entire mobile assembly in few seconds, without removing the speaker from its mounting position. For each configuration you can choose the mobile assembly which is most effective, differing in the number of spiders, cone material and voice coil impedance. The advantages are plain to see both when tuning the system and when on the competition field; perfect for the seasoned SPL competitor. Proving the synergy of the magnetic assembly, featuring a proprietary vented cooling system and the aluminium voice coil wound on a four layer former, power handling is rated at an amazing 8,000w. Performance not even imaginable with traditional designs: the M 12 UNLIMITED and M 15 UNLIMITED feature high thermal dissipation plates, massive double magnet assemblies and water-repellent, non-pressed paper or layered Kevlar cones (according to the selected RMA). Hertz SPL Monster subwoofers are most of all…. Evolution!
A product born to dominate in SPL circuits must be continuously improved to keep the pace as the competition catches up: the SPL Monster subwoofers will undergo continued modifications and upgrades, thanks to our ongoing research and the feedback we welcome from the competition field.
Check out link for more
SPL Monster amplifier
MP 15K Unlimited – SPL stereo amplifier 2x 7,500w £6,000.00
SPL Monster sub
M 12 unlimited – SPL sub 300mm 2x 1.2 Ohm, 2 spiders £1,200.00
M 15 Unlimited – SPL sub 380mm 2x 1.2 Ohm, 2 spiders £1,300.00
Amp Specs
Dimensions: (mm/inches): 323 x 830 x 68.5 & 12 3/4in x 32 11/16in x 2 3/4in
Weight: 25.5kg /56.2lb
Amplifier stage Distortion THD (A weighted, 100Hz @ 4 Ohms): 0.15 %
Bandwidth (-3 dB): 10 to 500 Hz
S/N Ratio (A weighted @ 1 V): 69dB
Damping factor (100Hz @ 4 Ohms): > 950
Pre-In sensitivity: 0.3 to 7V
Pre-In impedance: 15 kΩ
Lo-Pass: OFF / Lo-pass: 40 to 150Hz @ 24dB/Oct.
Subsonic: OFF / Hi-pass: 10 to 50Hz @ 24dB/Oct.
Output Mode: Stereo By-Pass / Bridge / L+R Mix
Chain Mode: Master / Slave
OUTPUT POWER (RMS) @ 12 VDC, THD 1%:
Load Impedance Stereo Bridge
4 Ω 1,000w x2 4,000w x1
2 Ω 2,000w x2 6,000w x1
1 Ω 3,000w x2 8,000w x1
OUTPUT POWER (RMS) @ 14.4 VDC, THD 1%:
Load Impedance Stereo Bridge
4 Ω 1,500w x2 5,600w x1
2 Ω 2,800w x2 9,000w x1
1 Ω 4,500w x2 12,000w x1
OUTPUT POWER (RMS) @ 16 VDC, THD 1%:
Load Impedance Stereo Bridge
4 Ω 1,800w x2 6,800w x1
2 Ω 3,400w x2 11,000w x1
1 Ω 5,500w x2 15,000w x1
OUTPUT POWER (RMS) @ 18 VDC, THD 1%:
Load Impedance Stereo Bridge
4 Ω 2,300w x2 8,800w x1
2 Ω 4,400w x2 12,000w x1
1 Ω 6,100w x2 15,500w x1