Tried some high level inputs vs RCA today
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Elite HDF Member
Joined: Aug 2008
Posts: 4,150
Likes: 459
From: S. FL
I've always read mixed reviews on these things? I know I looked up on upgrading the charging system and with what's available the math just wasn't enough of an increase in wattage to justify.
Road Warrior
Joined: Aug 2013
Posts: 1,505
Likes: 31
From: Las Vegas
I think the way most HU work, internally at least, is, the RCA's are coming off the preamp of the HU, bypassing the HU's internal amp thus going directly to the external amp which usaully has better SQ and less distortion. Thats why I was saying I used to look for CD recievers that had no internal amp and actually looked for one for my bike, but the only one I could find was a Alpine that listed for $1100. Thats why Haze said he got better SQ in his garage with the internal amp switched off. You could not run HL on the 998 with the internal amp switched off (I don't think). also you thoughts on getting HL from the rca's is confusing as well. Good stuff!!
Road Warrior
Joined: Jan 2013
Posts: 1,812
Likes: 122
From: Joliet IL.
Welcome back AAWAV. So how I understand it is, when you are using RCA outs to amp you can shut off the internal amp because you are only using the preamp on the 998 directly to your external amp. The only way you would need the internal amp is if you were running a separate set of speakers, say a hog tune tweeter pod off your HU. So if you turn off the internal amp you can't get the HL output we are discussing here or am I missing something? HL out put comes from reamplifying the internal preamp and amp in the HU and if you shut off the internal amp thusly no HL out put...right?
Last edited by Moto Mike; Dec 29, 2015 at 12:51 PM.
Road Warrior
Joined: Aug 2013
Posts: 1,505
Likes: 31
From: Las Vegas
Welcome back AAWAV. So how I understand it is, when you are using RCA outs to amp you can shut off the internal amp because you are only using the preamp on the 998 directly to your external amp. The only way you would need the internal amp is if you were running a separate set of speakers, say a hog tune tweeter pod off your HU. So if you turn off the internal amp you can't get the HL output we are discussing here or am I missing something? HL out put comes from reamplifying the internal preamp and amp in the HU and if you shut off the internal amp thusly no HL out put...right?
- by shutting down the internal END Amp, it reduces possible "interference/etc" in the HU, hence Pioneer, Kenwood, xxx HIGH end HU's have the option to shut down the end amp. besides the (way) reduced power usage by HU and potential heatpre-amp still works of course (for RCA outputs).
Road Warrior
Joined: Jan 2013
Posts: 1,812
Likes: 122
From: Joliet IL.
- by shutting down the internal END Amp, it reduces possible "interference/etc" in the HU, hence Pioneer, Kenwood, xxx HIGH end HU's have the option to shut down the end amp. besides the (way) reduced power usage by HU and potential heatpre-amp still works of course (for RCA outputs).
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Road Warrior
Joined: Aug 2013
Posts: 1,505
Likes: 31
From: Las Vegas
correct - HL output is your END amp signal. hope that clarifies it LOL
Stellar HDF Member
Joined: Oct 2015
Posts: 2,681
Likes: 851
From: Puyallup, wa
Yes HL will be shut off.