wiring crunch amp, 2 legacy subwoofers
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=112358
Printed Date: May 13, 2025 at 12:10 PM
Topic: wiring crunch amp, 2 legacy subwoofers
Posted By: tx78109
Subject: wiring crunch amp, 2 legacy subwoofers
Date Posted: March 14, 2009 at 7:26 PM
I have a Crunch P500.2 500 watts and 2 Legacy 800 watt subwoofers 4ohms. I need some help with the wiring. Thanks ------------- tx78109
Replies:
Posted By: supradude
Date Posted: March 14, 2009 at 8:38 PM
Are the subs 4 ohms DVC or SVC? What ohm load is the amp stable at? Give all of the info that you can.
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'85 Toy
Posted By: tx78109
Date Posted: March 14, 2009 at 9:48 PM
The subs are 4 ohms and the amp is either 2 or 4 ohms. I was told I could bridge them. I do not know where to find the dvc or svc.
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tx78109
Posted By: tx78109
Date Posted: March 14, 2009 at 9:51 PM
On the info sheet it states voice coil 1.5 ksv, fs (hz) 38, Qms 2.05, Qes .63, Qts .48, SPL (db) 89 and vas 1.794
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tx78109
Posted By: i am an idiot
Date Posted: March 15, 2009 at 12:02 AM
If they have only one positive and one negative connection, it is a single voice coil. If there is a set of + and - on each side of the basket, it is a dual voice coil. If they are single voice coil woofers, you can bridge them on the amp, but you MUST wire them in series for an 8 ohm load. The amp will produce the same exact power into an 8 ohm mono load as it will into a 4 ohm stereo load. Option 2 (series) = 8 ohm load
Speakers wired in series
Recommended Amplifier: Stable at 4, 2, or 1 ohm mono | 
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If they are Dual Voice coil woofers, you can bridge the amp at 4 ohm mono. Option 2 (series/parallel) = 4 ohm load
Voice coils wired in series, speakers wired in parallel
Recommended Amplifier: Stable at 4, 2, or 1 ohm mono | 
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Posted By: tx78109
Date Posted: March 15, 2009 at 10:30 AM
The subwoovers are svc but my amp can be used as a 2 or 4 ohm amp. What settings should I set the amp to. X-Over Mode FULL LPF HPF Mono Stereo level Bass EQ HPF LPF 5v - 0.2v 0db - 12db 60hz - 1.2khz 30hz - 250hz Thanks ------------- tx78109
Posted By: i am an idiot
Date Posted: March 15, 2009 at 3:23 PM
Are you sure that the amp is 2 ohm MONO stable? Or is it 2 ohm stable?
Posted By: tx78109
Date Posted: March 15, 2009 at 8:46 PM
This is what I know. Features:
Crunch P500.2 2 Channel 500 Watt Car Amplifier ( P5002 | P500-2 ) 500W 1 / 2-Channel A/B Class Amplifier125W x 2-Ch @ 4-Ohms or250W x 2-Ch @ 2-Ohms or 500W x 1-Ch @ 4-Ohms Dynamic Music Watts SEPP A/B-Class P-Series Amplifier Designs Bridgeable Design Illuminated, Large New Design Crunch Logo P. MOSFET Pulse Wave Modulated Power Supply For Instant Maxx Current Output 2-Ohm Capable A/B Class Amp Rugged MOSFET Audio Outputs P-Series Amp Protection with System Diagnostics LED's That Protects Against: Current / Amperage Overload Short Circuits Thermal Overload DC Offset 2/4Ch Amps Have Hi-Level Speaker Lead Inputs Silver Preamp Level RCA Inputs Daisy Chain Line Outputs Verssa Cross Sound Shaping Controls Mono/Stereo Switch HP/LP/Full-Pass Freq. Selections Crossover Frequency Adjustments: (60 Hz to 1.2kHz) (30 Hz to 250 Hz Low-Pass *) Adjustable (60Hz to 150Hz) & Include Variable Subsonic Filter (15Hz to 55Hz) Input Level Control (0.2 to 5V) Oversized Speaker Terminals------------- tx78109
Posted By: i am an idiot
Date Posted: March 15, 2009 at 10:09 PM
If you insist on bridging those speakers on that amp, you MUST run them in series. That amp is 2 ohm stereo stable. Which is the same thing as 4 ohm mono.
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