2ohm and 4ohm compatability speaker question
Discussion
Looking to upgrade my 8" door speakers, which are currently 4 ohms. Both a fellow Jaguar owner and audio specalist have recommended a pair of Helix i3 speakers as a plug and play upgrade, however they are 2ohms. Believe the Meridian amp is 4ohms.
From my research this could cause a problem and the sound quality will be poor, but I've been assured it will be ok.
Does anyone have experiecne of this scenario? Thanks in advance.
From my research this could cause a problem and the sound quality will be poor, but I've been assured it will be ok.
Does anyone have experiecne of this scenario? Thanks in advance.
TEKNOPUG said:
Are you certain that the speakers are 4ohm and original? All the Jag Meridian systems were 2ohm from the factory AFAIK. Can you take a photo of the speaker?
Original part number is CPLA-18808-FB. Google AI search suggests it's 4 ohms. No markings on the speakers though.
New speakers arrived today from Cambridge Autosound and I know this is what they fit on all Jaguar upgrades, but normally this would involve a new amp which I imagine is running 2ohms. They do know this though.
That's a Land Rover part not Jaguar. They are a straight swap from LR to Jag and people fit them because they are a higher quality speaker (Kevlar construction Vs paper). However, they are 4ohm, the original speakers are 2 ohm. As are all the other speakers (except the tweeters) and the amps.
So 2ohm speakers are correct for your car.
So 2ohm speakers are correct for your car.
TEKNOPUG said:
That's a Land Rover part not Jaguar. They are a straight swap from LR to Jag and people fit them because they are a higher quality speaker (Kevlar construction Vs paper). However, they are 4ohm, the original speakers are 2 ohm. As are all the other speakers (except the tweeters) and the amps.
So 2ohm speakers are correct for your car.
Appreciate your input, you're helping alleviate my concerns. So 2ohm speakers are correct for your car.
You're quite right that the above part is a common upgrade. This is the original part I removed, do you know if they are 2 or 4 ohm?
CPLA-18808-DB
Edited by scz4 on Tuesday 28th July 14:13
Edited by scz4 on Tuesday 28th July 14:14
scz4 said:
This is the original part I removed, do you know if they are 2 or 4 ohm?
If no-one knows, you can get a good enough idea with a standard multimeter.Obviously resistance for DC and impedance for AC are different, so you won't see 2 ohms or 4 ohms when you put your multimeter across it. However; the DC resistance of a speaker is around three quarters of it's AC impedance. So if it's a 4ohm speaker you'll see somewhere around 3ohms resistance. For a 2 ohm speaker it will be around 1.5 ohms.
This is not exact, but if you are seeing something over 2 ohms, it will be a 4ohm speaker.
donkmeister said:
If no-one knows, you can get a good enough idea with a standard multimeter.
Obviously resistance for DC and impedance for AC are different, so you won't see 2 ohms or 4 ohms when you put your multimeter across it. However; the DC resistance of a speaker is around three quarters of it's AC impedance. So if it's a 4ohm speaker you'll see somewhere around 3ohms resistance. For a 2 ohm speaker it will be around 1.5 ohms.
This is not exact, but if you are seeing something over 2 ohms, it will be a 4ohm speaker.
I'll need to test the new speakers to compare, but the originals settle at 1.9 if I've done it right. Obviously resistance for DC and impedance for AC are different, so you won't see 2 ohms or 4 ohms when you put your multimeter across it. However; the DC resistance of a speaker is around three quarters of it's AC impedance. So if it's a 4ohm speaker you'll see somewhere around 3ohms resistance. For a 2 ohm speaker it will be around 1.5 ohms.
This is not exact, but if you are seeing something over 2 ohms, it will be a 4ohm speaker.
Ok, so the XF has 2ohm speakers. The F-Tyoe however has a 2ohm midrange and a 4ohm woofer.
CPLA-18808 is the correct model code.
DA and DB are paper cones, FB is the upgraded Kevlar cone
The amp is 4ohms - I would assume that it is not 2ohm stable. therefore using 2ohm speakers runs the risk of the amp going into protection mode and switching off. Or trying itself. Depending on how hard you drive it
YMMV.
CPLA-18808 is the correct model code.
DA and DB are paper cones, FB is the upgraded Kevlar cone
The amp is 4ohms - I would assume that it is not 2ohm stable. therefore using 2ohm speakers runs the risk of the amp going into protection mode and switching off. Or trying itself. Depending on how hard you drive it
YMMV.
TEKNOPUG said:
using 2ohm speakers runs the risk of the amp going into protection mode and switching off. Or trying itself. Depending on how hard you drive it
YMMV.
Yeah this is my worry hence seeking confirmation, so thanks for that. I'm going to call Cambridge tomorrow and get their guideance as theyve worked on a few F-Types, especialy two owners have confirmed they've been running 2ohms for a while and all ok. If the amp shuts down, is it a temporary thing rather than blowing it?YMMV.
scz4 said:
Yeah this is my worry hence seeking confirmation, so thanks for that. I'm going to call Cambridge tomorrow and get their guideance as theyve worked on a few F-Types, especialy two owners have confirmed they've been running 2ohms for a while and all ok. If the amp shuts down, is it a temporary thing rather than blowing it?
Temporary. It's overheating protection.Done some more digging and there seems to be conflicting opinions as to whether the F Type is 2 or 4ohms (or XJ or LR...). That one you have measured in DC, is 2ohm. So feel free to disregard everything I've said and go with what you can see (measure)
TEKNOPUG said:
Temporary. It's overheating protection.
Done some more digging and there seems to be conflicting opinions as to whether the F Type is 2 or 4ohms (or XJ or LR...). That one you have measured in DC, is 2ohm. So feel free to disregard everything I've said and go with what you can see (measure)
Quick update for anyone else looknig to do the same. So using a multimeter I got 1.9 ohms on the Jag bass speakers, 2.2ohm on mids and 3.5ohms on tweeters. New Helix bass speakers show 2.0, so hoping I'll be fine. Done some more digging and there seems to be conflicting opinions as to whether the F Type is 2 or 4ohms (or XJ or LR...). That one you have measured in DC, is 2ohm. So feel free to disregard everything I've said and go with what you can see (measure)
Will update this thread tomorrow evening once fitted.
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