Hey Swez and guys. Thanks for the help. Swez, im sorry for what little help i am explaining my stuff. Im just not good with terms yet, as you can tell.
I returned the 2 channel amp and went with the Kenwood 1000 watt amp. Now, the amp says Bridgeable, but how do you bridge a mono amp. http://www.bestbuy.com/site/olspage.jsp?id=1051384109448&skuId=5292881&type=product&productCategoryId=cat03087 .
So that is my big question right now. I hooked the amp up to the speakers using the two middle inputs. The inputs went (++--) ..... for some reason my sub didnt hit any louder on the amp when i changed the wiring from series to parallel. I thought maybe im not getting all the power i can get outta my amp. Maybe i wired it wrong? who knows. What do you think guys.
Replies (4)
Relax_The_Mind on 07/2/2003 01:59:34
You cant bridge a true mono amp. Its most likely a 2-channel/mono amp but the Best buy site says its unavailable at the moment so ill try to take a look at it later.
As stated in your earlier post.
What model Comp VR do you have dual 4ohm or dual 2 ohm?
What type of box are they in?
Models numbers?
Swez on 07/2/2003 07:57:34
He mentioned a 15" Comp VR, 4 ohm DVC as the sub and to my recall, has only one sub? Is that correct Rob?
This is a MONO amp and that means only 1 channel output. Yes, you should have 2 inputs... (L&R) channels and this is usually RCA line level and speaker level inputs as well Which this model has.
The Mono bridged comment makes absolutely no sense to me. I think it is just wrong information that was added to the description section of this amp as it was translated from Japanese laguage to English ???
I checked the Kenwood web site and they have no info in this model KAC-8101D. I did look at Crutchfield and they sell a KAC-8151D that looks very good over all.
Here's the link: http://www.crutchfield.com/cgi-bin/S-P8TmkMoS9yN/ProdView.asp?a=&s=0&cc=01&g=130&id=detailed_info&i=113KAC8151
Not a bad amp, 1 ohm stable, full features but the power output numbers are a bit stange....
Specifications:
Rated power output at 2 ohms: 400 watts x 1 (100 Hz, 0.5% THD)
Rated power output at 1 ohm: 500 watts x 1 (100 Hz, 1.0% THD)
Max power output at 4 ohms: 1000 watts x 1
Input impedance: 10k ohms
Operating voltage: 14.4 V (11-16V allowable)
Current consumption (4 ohms, 10% THD): 31A
I would say the real world output on this amp is closer to 375 watts RMS @ 2 ohms... not bad but a JBL 600.1 cost less and will leave this amp in the dust power wise and reliabilty too.
Swez
Relax_The_Mind on 07/2/2003 15:13:45
I found that model on the Kenwood site:
Click here
Yup seems as Kenwood gives all the ratings for 14.4v...
Now hooking up you should on the speaker, hook up one set of terminals on one voice coil to the center inputs and the other set of terminals on the sub to the outer sets on the amp.
This is to make hooking them up easier and automatically parallels them. I am guessing that is what they mean by bridgeing...
RTM
Swez on 07/2/2003 17:11:29
Good job RTM.. I looked quickly before running off to work so I must have missed this product in the main site.
I agree about the "bridged" model you put forth.... odd way to say it though... bridging is normally associated with multi-channel amps.
The fact they rate the amp at input voltage of 14.4 means that's the 400 RMS @ 2 ohms noted, would actually be lower in real world car application as no stock car electrical system can sustain 14.4 volts for more than a few minutes after a cold start. Normally, most cars can sustain 13.0 - 13.5 volts.
In short, if you have 2 identical amplifiers, one is getting 14.4 volts and the other 13.0 volts.... here's the wattage output one can expect.
Assumptions:
1. A Class D amp, 90% efficiency
2. Same ohms load speaker
3. Both amps draw 30 amperes of current at full load
AMP A: 14.4 x 30 = 432 watts x 0.9 = 388.8 watts
AMP B: 13.0 x 30 = 390 watts x 0.9 = 351.0 watts
See how that all works? Gotta read and know how to interpret the specs of a give amplifier. Not all amps are rated the same either... so when comparing power, need to know the parameters each amp was tested at.
If anyone wants more information like this... just ask!
Swez
I returned the 2 channel amp and went with the Kenwood 1000 watt amp. Now, the amp says Bridgeable, but how do you bridge a mono amp. http://www.bestbuy.com/site/olspage.jsp?id=1051384109448&skuId=5292881&type=product&productCategoryId=cat03087 .
So that is my big question right now. I hooked the amp up to the speakers using the two middle inputs. The inputs went (++--) ..... for some reason my sub didnt hit any louder on the amp when i changed the wiring from series to parallel. I thought maybe im not getting all the power i can get outta my amp. Maybe i wired it wrong? who knows. What do you think guys.
Replies (4)
Relax_The_Mind on 07/2/2003 01:59:34
You cant bridge a true mono amp. Its most likely a 2-channel/mono amp but the Best buy site says its unavailable at the moment so ill try to take a look at it later.
As stated in your earlier post.
What model Comp VR do you have dual 4ohm or dual 2 ohm?
What type of box are they in?
Models numbers?
Swez on 07/2/2003 07:57:34
He mentioned a 15" Comp VR, 4 ohm DVC as the sub and to my recall, has only one sub? Is that correct Rob?
This is a MONO amp and that means only 1 channel output. Yes, you should have 2 inputs... (L&R) channels and this is usually RCA line level and speaker level inputs as well Which this model has.
The Mono bridged comment makes absolutely no sense to me. I think it is just wrong information that was added to the description section of this amp as it was translated from Japanese laguage to English ???
I checked the Kenwood web site and they have no info in this model KAC-8101D. I did look at Crutchfield and they sell a KAC-8151D that looks very good over all.
Here's the link: http://www.crutchfield.com/cgi-bin/S-P8TmkMoS9yN/ProdView.asp?a=&s=0&cc=01&g=130&id=detailed_info&i=113KAC8151
Not a bad amp, 1 ohm stable, full features but the power output numbers are a bit stange....
Specifications:
Rated power output at 2 ohms: 400 watts x 1 (100 Hz, 0.5% THD)
Rated power output at 1 ohm: 500 watts x 1 (100 Hz, 1.0% THD)
Max power output at 4 ohms: 1000 watts x 1
Input impedance: 10k ohms
Operating voltage: 14.4 V (11-16V allowable)
Current consumption (4 ohms, 10% THD): 31A
I would say the real world output on this amp is closer to 375 watts RMS @ 2 ohms... not bad but a JBL 600.1 cost less and will leave this amp in the dust power wise and reliabilty too.
Swez
Relax_The_Mind on 07/2/2003 15:13:45
I found that model on the Kenwood site:
Click here
Yup seems as Kenwood gives all the ratings for 14.4v...
Now hooking up you should on the speaker, hook up one set of terminals on one voice coil to the center inputs and the other set of terminals on the sub to the outer sets on the amp.
This is to make hooking them up easier and automatically parallels them. I am guessing that is what they mean by bridgeing...
RTM
Swez on 07/2/2003 17:11:29
Good job RTM.. I looked quickly before running off to work so I must have missed this product in the main site.
I agree about the "bridged" model you put forth.... odd way to say it though... bridging is normally associated with multi-channel amps.
The fact they rate the amp at input voltage of 14.4 means that's the 400 RMS @ 2 ohms noted, would actually be lower in real world car application as no stock car electrical system can sustain 14.4 volts for more than a few minutes after a cold start. Normally, most cars can sustain 13.0 - 13.5 volts.
In short, if you have 2 identical amplifiers, one is getting 14.4 volts and the other 13.0 volts.... here's the wattage output one can expect.
Assumptions:
1. A Class D amp, 90% efficiency
2. Same ohms load speaker
3. Both amps draw 30 amperes of current at full load
AMP A: 14.4 x 30 = 432 watts x 0.9 = 388.8 watts
AMP B: 13.0 x 30 = 390 watts x 0.9 = 351.0 watts
See how that all works? Gotta read and know how to interpret the specs of a give amplifier. Not all amps are rated the same either... so when comparing power, need to know the parameters each amp was tested at.
If anyone wants more information like this... just ask!
Swez
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