Planet-9

Do I need a MOST HUR?

Add to repair workspace

New repair projectOpen repair workspace

Original source

8 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHDo I need a MOST HUR?

Leading reported evidence

Replace head unit and the

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed
I took a different tack and replaced the head unit and the
Original post Read captured discussion
Do I need a MOST HUR?

Read full discussion summary

Leading evidence: 'Replace head unit and the' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace head unit and the' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 8 captured posts examined · 1 partial discussions

Compare 1 other evidence results

Use most adapter the impedance

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
If you are using a MOST adapter the impedance setting in the head unit doesn't matter.
Original post Read captured discussion
Do I need a MOST HUR?

Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace head unit and the

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed
I took a different tack and replaced the head unit and the
Original post Read captured discussion
Do I need a MOST HUR?

Use most adapter the impedance

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
If you are using a MOST adapter the impedance setting in the head unit doesn't matter.
Original post Read captured discussion
Do I need a MOST HUR?

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Planet-9: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

I've got a bose system on a 987.1 (2006 boxster S ) and I'm wanting to update the terrible head unit to something that has all the bells and whistles. Preferably on the cheap - so my question is that I'm looking to buy a chinese android head unit that might do what I want https://www.aliexpress.com/item/Das...ersal-with-Octa-Core-2GB-Ram/32805474302.html?shortkey=BnyMfYve&addresstype=600 and the audio chip http://www.st.com/resource/en/datasheet/tda7850.pdf Appears to output 4 x 55 watts RMS @ 2 ohms, 4 x 80 watts max @ 2 ohms So does that mean I can skip the MOST HUR and connect it directly? I'm very new to audio electronics, but I've got a software engineering background so I'm not entirely lost on the subject.

POST 2Original post

Yes looks like you still need it, but don't both with MOST HUR there is the Longate MOST. https://www.aliexpress.com/item/RCA...Porsche-fiber-optic-power-amplifier-to-aftermarket-Car-DVD-GPS/32708723316.html I use it on my 2007 CS with BOSE. Check out spiral audio's website for a complete kit with Longate MOST and the trim kit and wiring harness all in one package.

POST 3Original post

I know one of the Chinese head units come with their own MOST HUR harness. Not sure of this one. I took a different tack and replaced the head unit and the Bose Amp and got rid of the MOST system. More expensive than the Chinese stuff but compared to getting a MOST harness about the same price.

POST 4Original post

Under the heading of, you learn something every day: I'm an electronics engineer and I had to look up "MOST Bus" to figure out what you guys were talking about. In my own defense I've only worked in Aerospace and been in the automotive business. Anyway, @tuelz where did you get that the audio amp puts out 55 watts RMS. Looking at the spec sheet it does say watts but I did not find any reference to RMS watts. There is a big difference between the two. Also I noted that when it comes to distortion that amp goes to pot above about 20 watts. All that may not make much of a difference in such a small car. Good luck with your mod.

POST 5Original post

Thanks, so I'm not confident at all in what I'm saying - so feel free to correct everything, please! I'm hoping to learn while I'm doing this project. I got that copy/paste from an audio board https://www.parts-express.com/yuan-jing-tda7850-4-x-50w-audio-amplifier-board--320-6516 for the same chip. Not sure if the chip shares the same characteristics as the board, but I figured it might. anyways, after some more research I've seen nothing that builds confidence that I could do something like that so now my current build looks like this (and I'm somewhat more confident this should work) install kit with bose bass bypass harness https://www.amazon.com/dp/B00EUJLUME/ref=psdc_2230642011_t1_B00EUJENGE#customerReviews 5 channel amp (can I get away with just a 4 channel since the bose bass has internal amp?) https://www.amazon.com/Soundstream-...id=1523537309&sr=1-9&refinements=p_n_feature_keywords_six_browse-bin:7933268011 aftermarket android 8.0 head unit https://www.aliexpress.com/item/Das...2b6fa3aae301-0&algo_pvid=2bb26980-e255-432d-aee8-2b6fa3aae301&priceBeautifyAB=0 I think all these things should work fine - now I'm just looking for a decent guide for wiring up an aftermarket amp to an aftermarket head unit. Any tips/links y'all know of? I'm also still curious if anyone knows if the head unit I linked could drive the 2ohm speakers, but I'm less interested in testing it out for myself on my first car audio upgrade

POST 6Original post

The 7850L amp chip built into your planned head unit appears to be rated for 2 ohm speakers so it looks like your good. Please photo your install progress and post when done. Thanks!

POST 7Original post

If you are using a MOST adapter the impedance setting in the head unit doesn't matter. You're pulling the signal pre-amp (RCA cables)... The MOST adapter converts that Pre-amp signal to an optical one and feeds that into the Bose amp - this is the only piece that cares what the impedance is...

POST 8Original post

Thanks for the info! I'll definitely update when I get everything installed/working since my entire upgrade shouldn't cost more than $550 everything included does anyone know where I can find max watt specs for the speakers? I have the bose speakers (although no footwell bass) and I'm trying to buy an aftermarket amp to match up pretty cleanly to the speakers, but I can't find the specs anywhere. If you have it on hand, I'd also like to know where I can find specs for the factory AMP - I'm probably lookin in all the wrong places, but the forum search and my google-fu haven't turned up anything yet

This is a source reference. Confirm exact model applicability in the original material.