[Technic]

Originally Posted by pdjafari

Which option would you take assuming I use the blaupunkt 275?? Thanks again Technic!

http://www.crutchfield.com/p_023THA2...ures_and_specs

Based on those specs, I would guess the ideal setup would be 2 SWS8s in 4 ohms in a bridged setup???

The "ideal" set up for "a simple/easy setup" as you asked before is a THA275 powering a pair of 2 ohms SWS-8 in a stereo connection.

That will provide 90W RMS to each SWS-8 and allow you to use the PnP signal sensing feature.

To clarify, you do not have to use the THA275 as it is just a recommendation.

[scampos1984]

Originally Posted by CrimsonRedE93

You have to read the amplifer spec in detail and piece it all together, all the info is there somwhere.

If you are using the PNP cable as People who have the THA555 normally are you cannot use bridge mode so Fig 5 shows the only possible stereo sub connections using 2 x 4 Ohm speakers, also if you look in the power table is states 4 Ohm minimum on the sub channel.

No more thread jacking now

OK, thanks, but the 4ohm is referred to the speakers, so using two 4ohm subs in parallel in the 5th channels will make that channel of the amp working at 2ohm, which is correct.

However, no bridged mode can be used, as your image says.

[CrimsonRedE93]

Originally Posted by scampos1984

OK, thanks, but the 4ohm is referred to the speakers, so using two 4ohm subs in parallel in the 5th channels will make that channel of the amp working at 2ohm, which is correct.

However, no bridged mode can be used, as your image says.

If using the PNP cable you can only use Stereo mode, this then means that you can only use a minimum of 4 Ohms on either left or right sub channels, so you can only use 4 Ohms subs.

If you did use 2 Ohms instead the amp may cutout from overheating or randomly cut off when it it trying to produce a large peak of power which also may lead to speaker damage (but the protection on the THA555 is quite fast so this is unlikely).

In the good old days if you used a speaker with the impedance too low it would just burn out

[techforge]

I hope somebody more technically inclined out there can answer this question for myself and the OP. I bought a pair of the 2-ohm 8's. I plan to get the blau 275 amp. If I wire the subs in parallel each on their own stereo channel it should be 2-ohms right? The OP pm'd me and asked if I wired them in parallel if it would drop the resistance down to 1-ohm which the amp can't handle. My reasoning is no it will not unless I bridged the amp and drove them off the same channel. Is this correct?

[Technic]

Originally Posted by techforge

I hope somebody more technically inclined out there can answer this question for myself and the OP. I bought a pair of the 2-ohm 8's. I plan to get the blau 275 amp. If I wire the subs in parallel each on their own stereo channel it should be 2-ohms right? The OP pm'd me and asked if I wired them in parallel if it would drop the resistance down to 1-ohm which the amp can't handle. My reasoning is no it will not unless I bridged the amp and drove them off the same channel. Is this correct?

You must wire the 2 ohms SWS-8 individually to each channel of the THA275.

That's a stereo configuration.

A parallel connection doesn't apply to this particular amp in this particular application.

[techforge]

Originally Posted by Technic

You must wire the 2 ohms SWS-8 individually to each channel of the THA275.

That's a stereo configuration.

A parallel connection doesn't apply to this particular amp in this particular application.

Will using the oem harness to the subs work correctly?

[Technic]

Originally Posted by techforge

Will using the oem harness to the subs work correctly?

I don't understand the question... for the THA275 to properly work in this particular configuration you will need to use the 2 OEM underseat woofers OEM amp outputs as the 2 inputs of the THA275. So this amp upgrade will be working as OEM but with a pair of SWS-8 instead of the OEM units.

OEM HU -> OEM amp -> THA275 -> SWS-8 (L)/SWS-8(R)

Is that what you are asking?

[techforge]

That's what I plan to do - cut the existing lines from the oem amp to the subs and plug those into the input to the 275 via the plug and play harness, then take the leads to the subs that I cut and connect them to the outputs on the 275. I wasn't sure if I needed to run new lines to the subs.

[Technic]

Originally Posted by techforge

That's what I plan to do - cut the existing lines from the oem amp to the subs and plug those into the input to the 275 via the plug and play harness, then take the leads to the subs that I cut and connect them to the outputs on the 275. I wasn't sure if I needed to run new lines to the subs.

I think that the OEM wiring gauge to the underseat subs is either 18 or 16 depending if you have HiFi(18) or Logic7(16); the M3 Premium Audio woofers wire gauge is 12.

The 16 gauge will be enough to use those OEM wires for a short run under the seats with the THA275 power, the 18 gauge would be borderline. Check your wiring to be sure...

A 12 gauge will be perfect but not required.

[kaigoss69]

I have also been looking for an amp to power my future underseat subs (SWS-8) and while researching the Blaupunkt at Crutchfiled I stumbled across this Blaupunkt, the THA475PnP, which is virtually twice the amp compared to the THA275, since it has 4 channels of 75 watts each. It is on sale for $199. To drive the subs, you could bridge its 4 channels into 2 channels with 180 watts each, but you would have to have the 4 ohm subs, since the amp is not 2 ohm stable when bridged. This amp could also offer some flexibility for the future, if and when you decide to further upgrade your system because of its 4 channels. Here is the link: http://www.crutchfield.com/p_023THA4...owAll=N&tp=115

I will probably end up buying this amp since it is so easy to integrate, with the additional harness, as Technic pointed out. The other positive is that this is a class-D amp, which means it is much smaller and runs much cooler than traditional class A/B amps. Of course the THA275 will also work, if you don't need the extra power and channels.

PM me if you need a coupon code for Crutchfield or if you would like a referral code (only works if you have never bought from them before), to save another $40 on your order.

[Technic]

Originally Posted by kaigoss69

I have also been looking for an amp to power my future underseat subs (SWS-8) and while researching the Blaupunkt at Crutchfiled I stumbled across this Blaupunkt, the THA475PnP, which is virtually twice the amp compared to the THA275, since it has 4 channels of 75 watts each. It is on sale for $199. To drive the subs, you could bridge its 4 channels into 2 channels with 180 watts each, but you would have to have the 4 ohm subs, since the amp is not 2 ohm stable when bridged. This amp could also offer some flexibility for the future, if and when you decide to further upgrade your system because of its 4 channels. Here is the link: http://www.crutchfield.com/p_023THA4...owAll=N&tp=115

I will probably end up buying this amp since it is so easy to integrate, with the additional harness, as Technic pointed out. The other positive is that this is a class-D amp, which means it is much smaller and runs much cooler than traditional class A/B amps. Of course the THA275 will also work, if you don't need the extra power and channels.

PM me if you need a coupon code for Crutchfield or if you would like a referral code (only works if you have never bought from them before), to save another $40 on your order.

If you are going to bridge the THA475 then you cannot use the PnP harness speaker-level connector, you will need a separate LOC -either a LOC with a built in remote signal or you will need to run the OEM antena switching signal from the back of the OEM HU/CCC main connector pin 13 to the THA475 if the LOC doesn't have a remote signal built in- for the THA475 RCA inputs.

[kaigoss69]

Originally Posted by Technic

If you are going to bridge the THA475 then you cannot use the PnP harness speaker-level connector, you will need a separate LOC -either a LOC with a built in remote signal or you will need to run the OEM antena switching signal from the back of the OEM HU/CCC main connector pin 13 to the THA475 if the LOC doesn't have a remote signal built in- for the THA475 RCA inputs.

Why can't you use the harnesss with the 4 channel amp? Just curious. Crutchfield also has a Blaupunkt mono amp on sale for $199, would that work better?

Thanks.

[Technic]

Originally Posted by kaigoss69

Why can't you use the harnesss with the 4 channel amp? Just curious. Crutchfield also has a Blaupunkt mono amp on sale for $199, would that work better?

Thanks.

To be bridged, the RCA inputs, not the PnP system, must be used.

http://www.crutchfield.com/p_023THA4...=detailed_info

[kaigoss69]

Thanks Technic, you're on top of things like I used to be (many many years ago)

Here is a link to the mono amp: http://www.crutchfield.com/p_023THA1...nP.html?tp=115

So this one will work with the harness, right?

[Technic]

Originally Posted by kaigoss69

Thanks Technic, you're on top of things like I used to be (many many years ago)

Here is a link to the mono amp: http://www.crutchfield.com/p_023THA1...nP.html?tp=115

So this one will work with the harness, right?

The issue is bridging two channels into one channel with the PnP speaker connector, so as long as you are not bridging you can use the PnP speaker connector with any THA amp.

As this THA1250 is a mono -single channel- amp then there is no bridging.

[hkkuf]

Just to make sure...

I have this older blaupunkt 275 installed on my car powering the stock subs.
http://www.crutchfield.com/p_023THA2...=THA275&tp=115
This should be good enough to power SWS 2 ohms, right? It says 120 RMS at 2 ohm..

Thanks.

[Technic]

Originally Posted by hkkuf

Just to make sure...

I have this older blaupunkt 275 installed on my car powering the stock subs.
http://www.crutchfield.com/p_023THA2...=THA275&tp=115
This should be good enough to power SWS 2 ohms, right? It says 120 RMS at 2 ohm..

Thanks.

Yes...

[pdjafari]

just ordered 2 SWS 8s and the Blaupunkt 275.... it should all arrive Monday!!!

[kaigoss69]

Originally Posted by Technic

That connector that you need to cut from the harness below is one of the little connectors at the extreme right of that photo.



That connector plugs into the THA 275 port labeled "PnP Input", as shown in this photo:

Technic or others, I look at that harness and the plugs it has and then I look at the PNP input of the amp and I don't see which connector would fit. It seems that a Molex connector with 4 pins is needed on the BP amp. Instead of buying the expensive harness and butchering it for a small part, isn't it easier and cheaper just to buy the required 4 pin Molex connector?

So then the question is, where do you get this specific connector?

[pdjafari]

Just received my BP275 amp and the harness Technic linked above. For some reason, none of the connections on the PnP harness I bought will fit the BP amp...is there something I am missing?? I dont see how any part of this harness will appropriately 'fit' into the PnP input of the blaupunkt amp ...

[pdjafari]

Originally Posted by kaigoss69

Technic or others, I look at that harness and the plugs it has and then I look at the PNP input of the amp and I don't see which connector would fit. It seems that a Molex connector with 4 pins is needed on the BP amp. Instead of buying the expensive harness and butchering it for a small part, isn't it easier and cheaper just to buy the required 4 pin Molex connector?

So then the question is, where do you get this specific connector?

OMG same question!!!! It would appear the PnP harness does me no good, wouldnt it have been better/easier/cheaper simply to purchase a 4 pin molex connector??

[kaigoss69]

Originally Posted by pdjafari

OMG same question!!!! It would appear the PnP harness does me no good, wouldnt it have been better/easier/cheaper simply to purchase a 4 pin molex connector??

We need answers and we need them NOW !!!