Infinity CASCADE TWELVE, Service Manual

Cascade Model Twelve subwoofer     300 W Powered Sub/ Plate Amp 

LINE VOLTAGE

Yes/No

Hi/Lo Line

Nom.

Unit

Notes

NA 120vac/60Hz

Yes

108-132

120

Vrms

Normal Operation

EU 230vac/50-60Hz

Yes

207-264

230

Vrms

Normal operation, MOMS required

Parameter

Specification

Unit

QA Test 

Limits

Conditions

Notes

Amp Section

Type (Class AB, D, other)

D

---

Load Impedance (speaker)

4

Ohms

Nominal

Z-curve required

Rated Output Power

300

Watts

Regulated 120 V line

THD@ Rated Power

1

%

22k filter, 50Hz

300W

THD @ 1 Watt

0.5

%

22k filter, 50Hz

DC Offset

undefined

mV-DC

< 20

@ Speaker Outputs

Damping factor

20

N/A

> 15

measured at 50 Hz

Input Sensitivity

Line Input

260 mV

mVrms

300 W @ 50Hz

1 input driven

Signal to Noise

SNR-A-Weighted

100

dBA

relative to rated power

A-Weighting filter

SNR-unweighted

70

dBr

relative to rated power

22k filter

SNR rel. 1W-unweighted

60

dBr

relative to 1W Output

22k filter

Residual Noise Floor

2

mVrms

Volume @max, using RMS reading DMM/VOM (or A/P)

Residual Noise Floor

1

mVrms(max)

Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics)

Input Impedance

Line Input

6.5 k

ohms

Nominal

Active Filters
Low Pass (fixed or variable)

VARIABLE

--

Frequency

50 - 150 

Hz

Slope

24

dB/Octave

Q

Butterworth

           --

High Pass (HPF)

FIXED

--

Frequency

31

Hz

Slope

12

dB/Octave

Q

1.5

           --

Line Out  (BUFFERED)

STEREO

--

~ Unity Gain

Friend Circuit

FIXED

--

Frequency

60

Hz

notch filter

Slope

6

dB/Octave

Q

2.5

          --

Special filter

RABOS

--

Switches

Main Power ON/OFF

YES

--

Type

rocker

--

Located on amp plate

TV-5

Rabos ON/OFF

YES

--

Type

mini togle

--

Located on amp plate

Line/Spkr Input Select Switch

NO

--

Type

--

--

Polarity Switch

YES

--

"Off": 0°; "On": 180°

Type

mini togle 

--

Located on amp plate

Limiter

 (yes/no)

YES

compressor and limiter

THD at Max. Output Power

less than 2

%

Maximum Output Power

Maximum THD as a result of limiting.

Output Level Control

Volume Control Pot

YES

--

gain control mounted on amp panel

Taper (lin/log)

log A taper

--

@ minimum setting

no output

Input/Output Configuration

Line In

Stereo

--

RCA phono jack, gold plated

LFE In

YES

--

Shared with "R" Line In jack

Line Outputs (L,R)

YES

--

 Buffered all-pass line level L & R

M odel  T w elve 

 Cascade 

2