I have a 1990 Honda CRX in which I have:
Kenwood KDC-MP522
Alpine MRV-T320
Alpine 10" Sub
4-Kenwood co-axial speakers (installed in factory mounts)
2 Polk Audio EX Series Tweets and crossovers that are utilized at the front speakers.
My question would be this: I have a Blaupunkt BP2120 B Amplifier that I recently acquired and am curious whether or not it might be beneficial installing it. If so For which speakers and how to hook it up? My head unit has RCA's for the front that aren't being used. Can you advise?
Thanks,Ice
Replies (9)
swez on 04/3/2004 01:38:27
Cannot find that amp noted from Blau.
What do you wish to do with it?
Do you have a link to same?
What are the fuses used in this amp? (add them up)
Say more as I cannot determine what you want to do next.
Swez
iceintheback on 04/3/2004 02:43:43
Thanks for responding, sorry I wasn't more clear in my question. First of all the model number is BPA2120B, this is an older Blaupunkt amp dated early 90's I believe. It is in good shape and claims to be rated at 1X200 watts RMS or 2X100 watts RMS. I know that given it's age I should probably scrap it, but if it is decent I'd like to use it to power my additional speakers. The HU offers both an RCA for the rear (Sub utilizes this) and for the front (which is empty) I have 4 - 6.5 kenwood speaks running directly from the HU and wondered if I could somehow hook up this amp to power the 2 rear speaks? Can it be done and would it benefit the system at all? If so how would I go about hooking up the amp? It has 1 set of RCA's, 2 pos. speaker outs and 2 neg. speaker outs. Again the only Output on HU available is for the front. Let me know, Thanks, IcebrOh yeah, there are two 20 amp fuses in the amp.br
swez on 04/3/2004 09:15:50
Better... now we can do something with this info.
It might be a good idea to test the amp first to insure it is working properly. Best way to do that is to swap it out in place of your Alpine, set the low pass filter (~80 Hz) and gain (Midpoint) and see what you get. Bridge the amp and note if it gets very warm/hot when you turn it up.
If it does work, you can actually power all your interior speakers if it is 2 ohm stable. Most 2 channels that are bridgable, will handle a 2 ohm load in stereo. Won't have fade control over the rear speakers as you do now. But the fade will actually control interior (front) and sub (rear) fade settings.
Try the amp out first... then come back with your results and then we can proceed. This amp is probably closer to 250-300 RMS when bridged if fused properly at 40A.
Swez
iceintheback on 04/3/2004 11:32:16
Thanks Swez, I'll swap the Alpine with the Blaupunkt as recommended. You mentioned fusing the amp properly @ 40A. Would that mean to replace the 2-20A fuses with 2-40A fuses?
Ice
swez on 04/3/2004 13:09:00
No... as long as the amp is supposed to use 2x20 fuses... leave as is. If the amp is using larger fuses than recommended, there is a reason someone did that... but for now, let's assumed the 2x20's are correct.
Do your swap and see how well the Blau amp works.
Swez
iceintheback on 04/3/2004 21:52:18
Swez,
I swapped amps and it sounds good. Not quite as powerful as the Alpine but sufficient. How to peoceed at this point?
Ice
swez on 04/4/2004 11:53:07
Good... it works! Here's the steps you will perform to install this amp along with your Alpine.
1. Upgrade your power feed wire to #4 gage and install a 60-100A fuse in that line, near the battery. (a #4 wiring kit makes this easy)
2. Buy a Distibution block... one that has #4 input and a pair of #8 gage outputs... #8 gage wire to each amp is sufficient and use a pair of #8 grounds for the amps.
3. Run a pair of RCA lines from HU, back to amp location
4. We don't know if this amp is 2 ohm stable in 2 channel mode. Can try it and see how it handles that load. If not well, the Alpine will and just use the Blau for your sub (bridged MONO)
5. One very cool time saver here.... with the HU removed for RCA installs, remove the speaker wire harness from the HU and parallel wire FR/RR together, same thing on FL/RL. Connect your amp channel outputs to rear speakers and viola... you have 4 speakers powered by 2 channels.
Now, if you want to run all interior speakers off a 2 channel amp, can do this by wiring LF & LR to channel 1; RF & RR to channel 2. In parallel, this nets a 2 ohm load per channel. Looks like ~50 watts RMS per speaker this way.
You will not have fade control between F&R speakers, but will have L/R balance off the HU. The rear channel fader will control the sub output as wired now.
If the rear speakers are much louder than front speakers, can add L-pads to tone down the rears to a nice point of balance between front and rear speakers.
OK, that's the plan Stan... any questions, just ask.
Swez
iceintheback on 04/4/2004 13:17:09
Sounds good Swez, Hey thanks for the time and info! Much appreciated, and I'll let you know how it all works out!
Ice
swez on 04/4/2004 19:23:54
Good luck Ice and don't be surprized if you wind up using the Blau for you sub and the Alpine for interior speakers. It all depends on the filtering systems availablo on each amp.
For the sub, set the low pass filter (LPF) at ~80 Hz. This will block all frequencies above 80 Hz, to the sub.
As for the full range amp, (interior speakers) set the high pass filter (HPFto 80 Hz., as well. This will block out the lows to mids/highs for a cleaner, more crisp sound.
Good luck,
Swez
Kenwood KDC-MP522
Alpine MRV-T320
Alpine 10" Sub
4-Kenwood co-axial speakers (installed in factory mounts)
2 Polk Audio EX Series Tweets and crossovers that are utilized at the front speakers.
My question would be this: I have a Blaupunkt BP2120 B Amplifier that I recently acquired and am curious whether or not it might be beneficial installing it. If so For which speakers and how to hook it up? My head unit has RCA's for the front that aren't being used. Can you advise?
Thanks,Ice
Replies (9)
swez on 04/3/2004 01:38:27
Cannot find that amp noted from Blau.
What do you wish to do with it?
Do you have a link to same?
What are the fuses used in this amp? (add them up)
Say more as I cannot determine what you want to do next.
Swez
iceintheback on 04/3/2004 02:43:43
Thanks for responding, sorry I wasn't more clear in my question. First of all the model number is BPA2120B, this is an older Blaupunkt amp dated early 90's I believe. It is in good shape and claims to be rated at 1X200 watts RMS or 2X100 watts RMS. I know that given it's age I should probably scrap it, but if it is decent I'd like to use it to power my additional speakers. The HU offers both an RCA for the rear (Sub utilizes this) and for the front (which is empty) I have 4 - 6.5 kenwood speaks running directly from the HU and wondered if I could somehow hook up this amp to power the 2 rear speaks? Can it be done and would it benefit the system at all? If so how would I go about hooking up the amp? It has 1 set of RCA's, 2 pos. speaker outs and 2 neg. speaker outs. Again the only Output on HU available is for the front. Let me know, Thanks, IcebrOh yeah, there are two 20 amp fuses in the amp.br
swez on 04/3/2004 09:15:50
Better... now we can do something with this info.
It might be a good idea to test the amp first to insure it is working properly. Best way to do that is to swap it out in place of your Alpine, set the low pass filter (~80 Hz) and gain (Midpoint) and see what you get. Bridge the amp and note if it gets very warm/hot when you turn it up.
If it does work, you can actually power all your interior speakers if it is 2 ohm stable. Most 2 channels that are bridgable, will handle a 2 ohm load in stereo. Won't have fade control over the rear speakers as you do now. But the fade will actually control interior (front) and sub (rear) fade settings.
Try the amp out first... then come back with your results and then we can proceed. This amp is probably closer to 250-300 RMS when bridged if fused properly at 40A.
Swez
iceintheback on 04/3/2004 11:32:16
Thanks Swez, I'll swap the Alpine with the Blaupunkt as recommended. You mentioned fusing the amp properly @ 40A. Would that mean to replace the 2-20A fuses with 2-40A fuses?
Ice
swez on 04/3/2004 13:09:00
No... as long as the amp is supposed to use 2x20 fuses... leave as is. If the amp is using larger fuses than recommended, there is a reason someone did that... but for now, let's assumed the 2x20's are correct.
Do your swap and see how well the Blau amp works.
Swez
iceintheback on 04/3/2004 21:52:18
Swez,
I swapped amps and it sounds good. Not quite as powerful as the Alpine but sufficient. How to peoceed at this point?
Ice
swez on 04/4/2004 11:53:07
Good... it works! Here's the steps you will perform to install this amp along with your Alpine.
1. Upgrade your power feed wire to #4 gage and install a 60-100A fuse in that line, near the battery. (a #4 wiring kit makes this easy)
2. Buy a Distibution block... one that has #4 input and a pair of #8 gage outputs... #8 gage wire to each amp is sufficient and use a pair of #8 grounds for the amps.
3. Run a pair of RCA lines from HU, back to amp location
4. We don't know if this amp is 2 ohm stable in 2 channel mode. Can try it and see how it handles that load. If not well, the Alpine will and just use the Blau for your sub (bridged MONO)
5. One very cool time saver here.... with the HU removed for RCA installs, remove the speaker wire harness from the HU and parallel wire FR/RR together, same thing on FL/RL. Connect your amp channel outputs to rear speakers and viola... you have 4 speakers powered by 2 channels.
Now, if you want to run all interior speakers off a 2 channel amp, can do this by wiring LF & LR to channel 1; RF & RR to channel 2. In parallel, this nets a 2 ohm load per channel. Looks like ~50 watts RMS per speaker this way.
You will not have fade control between F&R speakers, but will have L/R balance off the HU. The rear channel fader will control the sub output as wired now.
If the rear speakers are much louder than front speakers, can add L-pads to tone down the rears to a nice point of balance between front and rear speakers.
OK, that's the plan Stan... any questions, just ask.
Swez
iceintheback on 04/4/2004 13:17:09
Sounds good Swez, Hey thanks for the time and info! Much appreciated, and I'll let you know how it all works out!
Ice
swez on 04/4/2004 19:23:54
Good luck Ice and don't be surprized if you wind up using the Blau for you sub and the Alpine for interior speakers. It all depends on the filtering systems availablo on each amp.
For the sub, set the low pass filter (LPF) at ~80 Hz. This will block all frequencies above 80 Hz, to the sub.
As for the full range amp, (interior speakers) set the high pass filter (HPFto 80 Hz., as well. This will block out the lows to mids/highs for a cleaner, more crisp sound.
Good luck,
Swez
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