Bad Speaker?

wingnut4772

One of mr rear surrounds is making a buzzing noise. I think I remember reading somewhere that if you gently push in the speaker and it makes a crunching noise it's toast. Is that right? It only makes that noise on one side when i push it in.

Conradicles

Sounds like you have a blown voice coil to me if it makes a rubbing or scratching noise when you press in the cone. If the tweeter is still good all you would need is a replacement woofer.

wingnut4772

That's what I was afraid of. I mean it still sounds ok just has that occasional buzz at certain frequencies. What would cause that?

Conradicles

That is the nature of voice coil rub. Certain frequencies and levels of sound will make itself known:)

wingnut4772

Oh well. ****.

wingnut4772

I am gonna get my speaker fixed but I want to avoid doing it again. I have both of the Totem Mask 6.5 in ceiling speakers hooked up to a Parsound HCA 1000a. I use them as my rear surround in a 7.1 configuration. My remaining speakers are run by a Parsound 5250 amp - including 2 more Totem Mask 8" side surrounds which I have no issues with. The HCA 1000 is 100 watts per channel and the 5250 is 250 watts per channel.
Is the 100 watts per channel not enough for the Totem Masks? They are pretty efficient but 6 ohms.


Note: I believe both rear surrounds to be affected.

drumminman

Unless you play your system at ear splitting volumes I would think that's enough clean power. Surrounds in an HT set up don't carry too much of the load, and that amp should put out more than enough clean power.

Just googled you HCA 1000a and here are the specs. Nice little amp:

FEATURES

Circuitry designed by John Curl
THX Ultra-certified
Direct Coupled -- no capacitors or inductors in signal path
Input stage uses hand matched complementary JFETs
12 beta-matched 15 amp, 50 MHz bipolar output transistors
785VA Toroid power transformer with independent secondary windings for each channel, 40,000 ?F power supply filter capacitance
Independent power supplies for each channel
DC Servo and relay protection circuits
Highbias Class A/AB operation
AC present, standby/normal, current overload indicators
Tiffany-style RCA input jacks, loop output jacks
12 volt DC automatic turn-on circuitry
Gold-plated 5 way speaker binding posts
Custom designed removable IEC AC cord
Rear mounted gain controls; ground lift switch
2 rack space height front panel
Rack mounting adapter available

SPECIFICATIONS

Continuous Power Output - Stereo:
125 watts RMS x 2, 20 Hz - 20 kHz, 8 Ω, both channels driven;
200 watts RMS x 2, 20 Hz - 20 kHz, 4 Ω, both channels driven
Continuous Power Output - Mono:
400 watts RMS, 20 Hz - 20 kHz, 8 Ω
Current Capacity:
45 amperes peak per channel
Slew Rate:
>130 V/?second
Power Bandwith:
5 Hz - 100 kHz, +0/-3 dB at 1 watt
Total Harmonic Distortion:
< 0.03% at full power; < 0.01 % typical levels
IM Distortion:
< 0.03 %
TIM:
unmeasurable
Dynamic Headroom:
> 1.5 dB
Interchannel Crosstalk:
> 80 dB at 1 kHz; > 60 dB at 20 kHz
Input Sensitivity:
1 V for 28.28 V, THX Reference Level; 1.1 V for full output
Input Impedance: 33 k Ω
S/N Ratio: > 116 dB, full power; > 96 dB, THX Reference Level
Damping Factor:
> 800 at 20 Hz
Power Consumption:
500 watts
Dimensions:
w 17 1/4" x h 3 1/2" x d 13 1/4", h 4 1/8" with feet
Net Weight:
22 lb

disneyjoe7

I wonder if HT system isn't balanced correctly, I can't see the surrounds getting such a volume to blow a woofer.