MTX Audio Thunder 6304, Thunder 6152 User Manual

AMPLIFIER OWNER’S MANUAL

POWER
AMPLIFIERS

AMPLIFIERS

2

3

• Intelligent Surface Mount Technology

• Patented PWM MOSFET Switching Power Supply (#5,598,325)

• Class A 100% Discrete Driver Circuit Topology

• New, more reliable high powered transformers

• Pure N-Channel Design

• Speaker and low level inputs inputs on Thunder6152

•

Color-coded wire harness for speaker-level input installation on Thunder6152

• Smart-Engage™ auto turn on for easy integration with factory head units (Thunder6152 only)

• Input select 2CH/4CH switch on Thunder6304 functions as a built-in Y connector

• Real Time Computerized Protection Circuit

• Acoustically Seamless Turn-on/Turn-off (i.e. no noise)

• Continuously variable/defeatable 12dB/octave high pass, 24dB/octave mono low pass crossover (variable from 40Hz to 200Hz)

• Continuously variable/selectable crossover output, switchable from full range/high pass/low pass outputs (Full range only on
Thunder6304)

• EBC Max on Thunder 8302, allows for control of additional subwoofer amps in a daisy chain configuration in low pass mode

• Continuously adjustable and defeatable Thunder EQ Bass enhancement circuitry, centered at 40Hz

• Left and right individually adjustable input sensitivity (Except for Thunder6304)

• Nickel-plated, heavy duty terminal block type connectors

• Unique rubber Insulated Iso-Feet™

•

Buffered, isolated output for daisy chaining multiple amplifiers

Features

Specifications

THUNDER8302

RMS Power measured at 12.5 Volts DC:
75 Watts x 2 into a 4 Ohm load with less than 0.1% Thd+N
150 Watts x 2 into a 2 Ohm load with less than 0.1% Thd+N
300 Watts bridged into a 4 Ohm load with less than 0.1% Thd+N
Dynamic Power (IHF-202 Standard) measured at 14.4 Volts DC
120 Watts x 2 into a 4 Ohm load
212 Watts x 2 into a 2 Ohm load
425 Watts bridged into a 4 Ohm load
Signal to Noise Ratio: ≥110dB A-Weighted
Damping Factor: >200
Frequency Response: 20Hz-20kHz ± 0.25dB
Maximum Input: 8Vrms
Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz
Crossover: Variable 40Hz to 200Hz, 12dB/octave high pass,
24dB/octave low pass with mono output
Dimensions: 9.2" x 9.75" x 2" (22.8cm x 22.8cm x 5.1cm)

11.5" x 9.75" x 2.1" (29.2cm x 24.8cm x 5.3cm) Including IsoFeet™

THUNDER6152

RMS Power measured at 12.5 Volts DC:

37.5 Watts x 2 into a 4 Ohm load with less than 0.1% Thd+N
75 Watts x 2 into a 2 Ohm load with less than 0.1% Thd+N
150 Watts bridged into a 4 Ohm load with less than 0.1% Thd+N
Dynamic Power measured at 14.4 Volts DC
90 Watts x 2 into a 4 Ohm load
165 Watts x 2 into a 2 Ohm load
325 Watts bridged into a 4 Ohm load
Signal to Noise Ratio: ≥110dB A-Weighted
Damping Factor: >200
Frequency Response: 20Hz-20kHz ± 0.25dB
Maximum Input: 8Vrms
Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz
Crossover: Variable 40Hz to 200Hz, 12dB/octave high pass,
24dB/octave low pass with mono output
Dimensions: 8.3" x 9.75" x 2" (21.1cm x 24.8cm x 5.1cm)

10.7" x 9.75" x 2.1" (27.2cm x 24.8cm x 5.3cm) Including IsoFeet™

THUNDER6304

RMS Power measured at 12.5 Volts DC:

37.5 Watts x 4 into a 4 Ohm load with less than 0.3% Thd+N
75 Watts x 4 into a 2 Ohm load with less than 0.3% Thd+N
150 Watts x 2 bridged into a 4 Ohm load with less than 0.3% Thd+N
Dynamic Power (IHF-202 Standard) measured at 14.4 Volts DC
90 Watts x 4 into a 4 Ohm load
165 Watts x 4 into a 2 Ohm load
325 Watts x 2 bridged into a 4 Ohm load
Signal to Noise Ratio: ≥110dB A-Weighted
Damping Factor: >200
Frequency Response: 20Hz-20kHz ± 0.25dB
Maximum Input: 8Vrms
Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz
Crossover: Variable 40Hz to 200Hz, 12dB/octave high pass,
24dB/octave low pass with mono output
Dimensions: 11.5" x 9.75" x 2" (29.2cm x 24.8cm x 5.1cm)

13.9" x 9.75" x 2.1" (35.3cm x 24.8cm x 5.3cm) Including IsoFeet™

CONGRATULATIONS...

on your purchase of a new MTX Audio
Thunder Amplifier! MTX has long been
the industry leader in mobile enclosures
and speakers, and we have reached
new heights with the development of the
new MTX Thunder amplifiers. You
couldn’t have chosen a more reliable,
powerful, or better performing amplifier.
In fact, we back up every Thunder
amplifier with a three-year warranty if
installed by an authorized MTX Audio
retailer (see the warranty statement).

Your new MTX Thunder amplifier was
designed, built and thoroughly tested at our
state-of-the-art electronics manufacturing
facility in Phoenix, Arizona. We manufacture
every amplifier using the latest Intelligent
Surface Mount Technology. Some of the
advantages of the new design are its signifi­cant improvements to the amplifier’s electrical
and mechanical properties. ISMT devices
feature substantially shorter internal and
external lead lengths. This reduces stray
capacitance and inductance, which results in
cleaner and more accurate musical reproduc­tion with significantly less noise interference.
The ISMT mounter produces amplifier boards
with smaller and lighter components, which
are more resistant to vibrations inherent in the
automotive environment.

A word about power ratings. It is important for you
to know how they stack up. MTX has chosen the
most honest, most conservative way to rate our
amps. We show you the RMS power, at 12.5 volts,
and dynamic power at 14.4 volts. However, we go
above and beyond the call of duty. We test each
amplifier. The technician records the “actual”
power output, and records this number on your
Certified Performance Certificate. The amplifier

must meet or exceed the rated specification
before we’ll ship it. No questions. No exceptions.

We want to ensure you get continuous high
performance from your MTX Thunder
amplifier, so we recommend that you have it
professionally installed by your authorized
MTX dealer.

HOW TO USE THIS MANUAL

If you are installing this amplifier yourself, we
recommend that you read the manual cover­to-cover before you install it. Familiarize
yourself with the features and details on the
input and output panels. Make sure you have
all the equipment you need. Then follow the
step-by-step installation instructions included.
Sample installation diagrams may be found
on our website:

mtx.com

If you have any questions, write or call us:

MTX Audio

4545 E. Baseline Rd. Phoenix, AZ 85042

602-438-4545 • 800-CALL MTX

[e-mail]

mtx.com

Please take a moment to register your

purchase on line at mtx.com.

Please also record the serial number of
your amplifier in the space provided below
and keep this manual for future reference,
as well as your sales receipt as proof of
ownership. (The serial number of your
amplifier is marked on the bottom of its
metal chassis.)

Serial Number:
Date of Purchase:

Introduction

ENGLISH

AMPLIFIERS

4

5

1. Gain Controls – These controls are used to match the input sensitivity of the amplifier to the particular source
unit that you are using. The controls are factory set to 1Vrms. Note that the Thunder6304 has a separate gain
control for front and rear channels.

2. RCA Input Jacks – These RCA input jacks are for use with source units that have RCA or Line Level Outputs.
An independent set of jacks are provided on the Thunder6304 for front and rear stereo inputs. A source unit with
a minimum level of 200mV is required for proper operation. The use of high quality twisted pair cables is rec­ommended to decrease the possibility of radiated noise entering the system.

3. Input Select 2CH/4CH – This switch, found on the Thunder6304, is used to match the amplifier’s input to the
source unit’s output so all four channels of the amplifier are driven. If your source unit has 2 outputs (a left and
right) connect them to the amplifier’s front channel inputs, and place the input select switch in the 2CH position.
If your source unit has 4 outputs, (left front, left rear, and right front, right rear) connect them to the amplifier
inputs and place the input select switch in the 4CH postion. In the 4CH position, the fader on your source unit
will operate.

4. Speaker Level Inputs – This input, found on the Thunder6152 will allow the amplifier to operate from source
units with speaker-level outputs. Output speaker leads from the source unit should be tied directly to the wire
harness provided with the amplifier.

Wire harness color codes:
Grey / Black = Source units right negative (-) White / Black = Source units left negative (-)
Solid Grey = Source units right positive (+) Solid White = Source units left positive (+)

With the Smart-Engage™ auto-turn circuit, a remote turn-on wire is not necessary when connecting the speaker-level
input wire harness to a high powered source unit. The amplifier will automatically turn on when music is received.

5. Frequency Control – This control is continuously adjustable from 40Hz through 200Hz. Factory setting is at 40Hz.

6. Crossover Select – This switch determines what type of signal comes out of the amp. If you select high pass,

the crossover slope is 12dB/stereo. If you select low pass, your crossover slope will be 24dB/mono. Available
crossover frequencies are 40-200Hz.

7. Thunder EQ – This equalization circuit is used to enhance the low frequency response of the vehicle’s interior.
With up to 18 dB of boost and centered at 40Hz, the Bass EQ can be adjusted to meet your own personal taste.

8. Compression Circuit – This new circuit, found on the Thunder8302, prevents the amplifier from going into clip­ping, even at high SPL levels. The compression circuit allows the listener to play the amplifier at high volume lev­els, yet protects the speakers against the potential damage that can occur during dynamic musical passages. The
circuit is switchable on/off, for those SPL competitors who run their amplifiers into clipping on purpose.

Warning: Damage to speakers may occur when the compression circuit is in the off position.

9. EBC 2 – The EBC, or Electronic Bass Control, allows a remote bass control to be adjusted from the driver’s

seat. If the optional EBC is installed, the bass level will be able to be adjusted to overcome noise and other inter­ference. With EBC 2 multiple amplifiers can be controlled. (Not included on Thunder6152 or 6304)

10. RCA Output Jacks and Switch – These RCA outputs allow for a signal to be sent to other amplifiers in a
daisy-chain configuration.. You can select whether the signal should be high pass , low pass or full range. In
low pass mode, the RCA outputs allow for multiple bass amplifiers to be level controlled using one EBC. On the
Thunder 6304, the RCA output jacks provide a line level full-range summed output of the Right Front/Right Rear
and Left Front/Left Rear input signals.

Input Panel Layout

❶

❼

❹

❺

❻

❶

➒

❺

❻

❷❿

❼

❷

❿

❷

❻

❶

❺

❼

❸

❶

❼

❺

❻

❷❿

❿

❿

❽

AMPLIFIERS

6

7

1. Fuses - For convenience, all amplifiers utilize ATC type fuses. For continued protection in the event that a
fuse blows, replace the fuse only with the same value.
Caution: The power fuses on the amp are for protecting the amp against overdrive. To protect the vehicle’s
electrical system, an additional fuse is required within 18" of the battery on the 12V+ cable.

Thunder6152 - 30A
Thunder6304 - 25A x 3
Thunder8302 - 30A x 2

2. Power Terminal – This is the main power input for the amplifier and must be connected direct­ly to the positive terminal of the car battery for the amplifier to operate properly. See the chart
below for recommended cable sizes for each amplifier. Use caution when running this cable
through the car. Try to avoid the input RCA cables, antenna cabling, or other sensitive equipment
as the large amount of current flowing through this cable can induce noise into your system. It is
also very important to have a tight connection to ensure maximum performance.

Thunder6152 – 10 Gauge
Thunder6304 – 6 - 8 Gauge
Thunder8302 – 8 Gauge

3. Ground Terminal – A good quality ground is required for your Thunder Amplifier to operate at
peak performance. A short length of cable the same gauge as your power cable should be used
to attach the ground terminal directly to the chassis of the car. Always scrape or sand any paint­ed surfaces to expose bare metal where the ground wire will attach.

4. Remote Terminal – All Thunder Amplifiers can be turned on by applying 12 volts to this termi­nal. Typically this voltage is supplied by a wire from the source unit marked “remote” or “electric
antenna”.

5. Speaker Terminals – As shown in the wiring diagrams, be sure to observe speaker polarity
through the system. Failing to wire the speakers in proper phase could result in a loss of bass
response and/or poor overall sound quality. Caution: Thunder amplifiers are not recommended for

loads below 2 ohms stereo or 4 ohms bridged.

6. Power LED (top of heatsink)-

A lighted LED indicates that power has been applied to the amplifier. +12V
from the battery to the +BATT terminal (#10) and +12V from a switched ignition or remote lead from a
head unit. An unlighted LED indicates power has been removed or the amplifier has overheated. In the
case of the overheat condition, the amplifier will turn back on after it cools down.

Output Panel Layout

❶

❺

❷❶❹❸

❺

❶

❷

❹

❸

❷

❹

❸

❺

AMPLIFIERS

8

9

The following list of terms with their definitions is
offered as help in understanding the set-up and oper­ation of your amplifier.

1. Crossover (xover) - an electrical filter with high-pass or
low-pass characteristics that divides the frequency range
into playable bands for certain speakers. Subwoofers, mid­bass, midrange and tweeters are all designed to play differ­ent frequencies and should do so to avoid damage. The
xover point is where the playable frequencies cross from
one speaker to the next at -3dB below reference level.

2. Full-range - refers to signals which cover the entire audio
frequency span from 20Hz to 20kHz.

3. High-pass - simply put, this blocks lower frequencies
which damage smaller speakers, and passes the higher
frequencies for smaller speakers like the midrange and
tweeter.

4. Low-pass - you got it, this is the inverse of a high-pass. It
blocks higher frequencies and passes the playable lower
frequencies to the larger speakers, like subwoofers.

5. Impedance - the resistance to the flow of current in an
alternating current circuit (such as with music). Line level
circuits are typically a high impedance of several thousand
ohms, while speaker level circuits are usually a low imped­ance of a few ohms.

6. Line level - the type of signal produced at the outputs of
tape decks, CD tuners, preamplifiers, etc., with a typical
value of a volt or less in a high impedance circuit.

7. Speaker level - the type of output that is meant to drive
speakers. These signals are sometimes called high level
and are usually connected by two conductor speaker wires

8. Signal - the signal of an audio system is what is heard
from the speakers. These signals may be high pass, low
pass or full-range.

We don’t have enough space for Electronics 101, so if you
have a good, bad or amusing question, please call us TOLL
FREE at 800-CALL MTX! (800-225-5689)

Adjusting the Gain

1. Turn the gain controls on the amplifier all the way down.

2. Turn up the volume control on the source unit to

approximately 3/4 of maximum.

3. Adjust one gain control on the amplifier until audible

distortion occurs.

4. Adjust that same gain control down until audible

distortion disappears.

5. Follow steps 3-4 for other gain control settings.

6. When the Thunder6152 and 8302 is bridged, adjust only

the left channel gain control.

7. The amplifier is now calibrated to the output of the

source unit.

Typical Speaker

Wiring

Configurations

Definitions of Common Terms

Read this if you wanna be a do-it-yourselfer - or give us a call at 800-CALLMTX.

Problem Cause Solution

No LED indication No +12V at remote connection Supply +12V to terminal

No +12V at Power connection Supply +12V to terminal
Insufficient ground connection Verify ground connection
Blown power fuse Replace fuse

LED on, no output Volume on head unit off Increase volume on head unit

Speaker connections not made Make speaker connections
Gain control on amplifier off Turn up gain
Signal processing units off Apply power to signal processor
All speakers blown Replace speakers

Output distorted Head unit volume set too high Lower head unit volume

Amplifier gain set too high Lower amplifier gain

Balance reversed Speakers wired L + R reversed Wire speakers with correct orientation

RCA inputs reversed Reverse RCA inputs

Some balance reversed Some Speakers wired L + R Wire speakers with correct orientation

reversed
Some RCA inputs reversed Reverse appropriate RCA inputs

Bass is boomy Thunder EQ too high Lower setting

Bass is weak Thunder EQ too low Raise setting

Speakers wired out Wire with correct phase
of phase
Not using MTX woofers Buy MTX woofers

Blowing fuses Excessive output levels Lower volume

Amplifier defective Return for service

Troubleshooting Guide

Stereo Amplifier
Bridge Mode Application
Impedance Requirement

4 ohm bridge minimum
2 ohm stereo minimum

8 ohm

8 ohm

+ - - +
L L R R

AMP

Two 8 ohm Speakers

OK

4 ohm

4 ohm

+ - - +
L L R R

AMP

Two 4 ohm Speakers

not

ok

AMPLIFIERS

10

11

FELICITATIONS...

vous félicitant de votre achat d’un nou­veau amplificateur MTX Audio Thunder !
MTX a été depuis longtemps un leader
dans l’industrie d’enclos mobiles et
speakers, et nous sommes arrivés à un
nouveau sommet avec le développement
des nouveaux amplificateurs MTX
Thunder. Vous n’auriez pas pu choisir
d’amplificateur plus fiable, plus puissant
ou meilleur - en effet ; nous garantissons
pendant trois ans chaque amplificateur
Thunder s’il est installé par un vendeur
agréé (voir la garantie).

Votre nouvel amplicateur MTX Thunder a été
conçu, construit et testé dans notre usine
électronique de dernier cri à Phoenix,
Arizona. Nous fabriquons chaque amplifica­teur en employant la Technologie Surface
Mount le plus récent et intelligent . Quelques
advantages du nouveau dessin sont les per­fectionnements aux propriétés mécaniques et
électriques de l’amplificateur. Les mécan­ismes SMT ont de substantiellement plus
courtes longueurs internes et externes. Cela
réduit l’inductance et la capacitance égarées,
qui résulte en une reproduction musicale plus
pure et plus exacte avec considérablement
moins d’intervention du bruit. Le SMT
mounter produit des cartes d’amplificateur
avec plus petits et plus légèrs composants qui
sont plus résistants aux vibrations inhérentes
dans l’environnement automobile.

Un mot au sujet d’évaluations de puissance.
C’est important de savoir comment elles s’y
comparent. MTX a choisi la méthode la plus
honnête et la plus conservatrice d’estimer les
ampères. Nous vous montrons la puissance
RMS, aux 12,5 volts et la puissance
dynamique aux 14,4 volts. Cependant ; nous
allons au-delà l’appel de devoir. Nous testons

chaque amplificateur. Le technicien enreg­istre la puissance de sortie ‘actuelle’, et puis
il note ce nombre sur votre Certificat de
Performance Attesté. L’amplificateur doit sat­isfaire ou dépasser les spécifications d’évalu­ation avant d’être envoyé. Pas de questions.
Pas d’exceptions.

Nous voulons tout faire pour assurer que vous
obtenez la haute performance continue de
votre amplificateur MTX Thunder, donc nous
vous recommandons de l’avoir installé profes­sionellement par votre vendeur agréé.

COMMENT UTILISER CE MANUEL

Si vous installez cet amplificateur vous­même, nous vous recommandons de lire ce
manuel de la première à la dernière page
avant de l’installer. Familiarisez-vous avec les
caractéristiques et les détails des panneaux
entrée-sortie. Vérifiez que vous avez tout
l’équipement dont vous avez besoin. Puis
suivez les instructions d’installation point par
point qui se trouvent. Vous pouvez trouver
des échantillons des diagrammes d’installa­tion sur le Web à notre site :

mtx.com

Si vous avez des questions, écrivez ou

téléphonez-nous à:

MTX Audio

4545 E. Baseline Rd.

Phoenix, AZ 85042

602-438-4545

800-CALL MTX

[e-mail]

mtx.com

Introduction

FRANÇAIS

• Technologie de montage en surface intelligente

• Alimentation à découpage MOSFET PWM brevetée (brevet 5 598 325)

• Topologie de circuit moteur 100 % discret de classe A

• Nouveaux transformateurs haute puissance plus fiables

• Conception N-voies pure

• Entrées de haut-parleur et de bas niveau sur Thunder 6152

• Faisceau de fils codés en couleur pour installation d’entrée au niveau haut-parleur sur Thunder 6152

• Mise en marche automatique Smart-Engage™ pour faciliter l’intégration avec des unités installées en usine
(Thunder 6152 uniquement)

• Sélecteur d’entrée 2 voies/4 voies sur Thunder 6304 fonctionnant comme un connecteur en T intégré

• Circuit de protection informatisé temps réel

• Marche/arrêt transparente au plan acoustique (silencieuse)

• Filtre passe-haut variable et contournable continuellement, 12dB/octave, ou filtre passe-bas mono de 24 dB/octave
(variable de 40 à 200 Hz)

• Sortie de filtre passe-bande sélectionnable/ variable en continu, basculable entre sorties pleine gamme/passe-

haut/passe-bas (pleine gamme uniquement sur Thunder 6304)

• EBC Max sur Thunder 8302 permet de commander des amplis de subwoofers supplémentaires dans une configura
tion en série dans un mode passe-bas

• Circuit d’amplification des basses Thunder EQ Bass réglable et contournable continuellement, centré à 40 Hz

• Sensibilité d’entrée individuellement réglable à gauche et à droite

• Connecteurs de type bornier renforcé, plaqués nickel

• Iso-Feet™ isolés uniques¸en caoutchouc

• Sortie isolée avec amplificateur séparateur pour les amplificateurs multiples en série

Caractéristiques

Specifications

THUNDER8302

RMS Power measured at 12.5 Volts DC:
75 Watts x 2 into a 4 Ohm load with less than 0.1% Thd+N
150 Watts x 2 into a 2 Ohm load with less than 0.1% Thd+N
300 Watts bridged into a 4 Ohm load with less than 0.1% Thd+N
Dynamic Power (IHF-202 Standard) measured at 14.4 Volts DC
120 Watts x 2 into a 4 Ohm load
212 Watts x 2 into a 2 Ohm load
425 Watts bridged into a 4 Ohm load
Signal to Noise Ratio: ≥110dB A-Weighted
Damping Factor: >200
Frequency Response: 20Hz-20kHz ± 0.25dB
Maximum Input: 8Vrms
Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz
Crossover: Variable 40Hz to 200Hz, 12dB/octave high pass,
24dB/octave low pass with mono output
Dimensions: 9.2" x 9.75" x 2" (22.8cm x 22.8cm x 5.1cm)

11.5" x 9.75" x 2.1" (29.2cm x 24.8cm x 5.3cm) Including IsoFeet™

THUNDER6152

RMS Power measured at 12.5 Volts DC:

37.5 Watts x 2 into a 4 Ohm load with less than 0.1% Thd+N
75 Watts x 2 into a 2 Ohm load with less than 0.1% Thd+N
150 Watts bridged into a 4 Ohm load with less than 0.1% Thd+N
Dynamic Power measured at 14.4 Volts DC
90 Watts x 2 into a 4 Ohm load
165 Watts x 2 into a 2 Ohm load
325 Watts bridged into a 4 Ohm load
Signal to Noise Ratio: ≥110dB A-Weighted
Damping Factor: >200
Frequency Response: 20Hz-20kHz ± 0.25dB
Maximum Input: 8Vrms
Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz
Crossover: Variable 40Hz to 200Hz, 12dB/octave high pass,
24dB/octave low pass with mono output
Dimensions: 8.3" x 9.75" x 2" (21.1cm x 24.8cm x 5.1cm)

10.7" x 9.75" x 2.1" (27.2cm x 24.8cm x 5.3cm) Including IsoFeet™

THUNDER6304

RMS Power measured at 12.5 Volts DC:

37.5 Watts x 4 into a 4 Ohm load with less than 0.3% Thd+N
75 Watts x 4 into a 2 Ohm load with less than 0.3% Thd+N
150 Watts x 2 bridged into a 4 Ohm load with less than 0.3% Thd+N
Dynamic Power (IHF-202 Standard) measured at 14.4 Volts DC
90 Watts x 4 into a 4 Ohm load
165 Watts x 4 into a 2 Ohm load
325 Watts x 2 bridged into a 4 Ohm load
Signal to Noise Ratio: ≥110dB A-Weighted
Damping Factor: >200
Frequency Response: 20Hz-20kHz ± 0.25dB
Maximum Input: 8Vrms
Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz
Crossover: Variable 40Hz to 200Hz, 12dB/octave high pass,
24dB/octave low pass with mono output
Dimensions: 11.5" x 9.75" x 2" (29.2cm x 24.8cm x 5.1cm)

13.9" x 9.75" x 2.1" (35.3cm x 24.8cm x 5.3cm) Including IsoFeet™