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FDP Forum / Miscellaneous and Non-Fender Topics / 16 Ohm output into an 8 Ohm speaker?

Viera
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Jun 21st, 2018 08:23 PM   Edit   Profile   Print Topic   Search Topic

Specifically a Marshall DSL1HR into a Celestion V-30.

Yeah I know. This topic has been discussed before. I did some searching and found differing opinions. The general consensus was that Fender amps handle mismatches better than other makes like, well, Marshall.

What says the FDP?

5Strats
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Edmond/OKC

GospelBilly!
Jun 22nd, 2018 05:28 AM   Edit   Profile   Print Topic   Search Topic

Considering I own four heads and three cabs (three which are Marshall heads), you'd think I'd know the answer. (:oD

I match the amp oms setting to that of the cab. There are other options that work but I'm not certain enough about them to give advice.

Viera
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Jun 22nd, 2018 06:44 AM   Edit   Profile   Print Topic   Search Topic

Thanks.

I don't plan on getting another cab, so I'm looking into other amps. I really am intrigued by that Marshall DSL1HR for home playing though.

Leftee
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VA

Jun 22nd, 2018 06:53 AM   Edit   Profile   Print Topic   Search Topic

Good

Thread on the subject.

RDR
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I tried to think

but nothing happened!
Jun 22nd, 2018 09:18 AM   Edit   Profile   Print Topic   Search Topic

Try one of these

Weber Z Matcher

Peegoo
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is gonna get et
Jun 22nd, 2018 09:27 AM   Edit   Profile   Print Topic   Search Topic

The output transformer on an amp is sort of like the transmission of a car. It's all about efficiency: if the power isn't properly transmitted to the wheels, the engine either works too hard and you wear it out prematurely, or there's no way to get all the available engine power to the wheels.

You can get away with amp/speaker impedance mismatches, so long as you don't play the amp cranked up and the output transformer doesn't get too hot. But tone and volume will suffer because of it.

ejm

usa

Jun 22nd, 2018 11:03 AM   Edit   Profile   Print Topic   Search Topic

From the manual:
19. LOUDSPEAKER
Connect a single speaker cabinet here
for the DSL1HR head, or a optional 1 x
16OHM extension speaker cabinet for
the DSLCR combo.
WARNING: Only ever connect a single
1 x 16 Ohm speaker cabinet. Any other
speaker configuration may stress the power
amplifier section and in extreme cases may
lead to valve and/or output transformer
failure.

For reference: The amp is about $300 new.
The 50 watt Weber Z matcher is $124.

There were a couple of guys on the internet that said that even the 1 watt setting was kinda loud for home use.
If you have a cabinet that you are willing to modify, you could put an 8 ohm 5 or 10 watt resistor in series with the speaker. (Or build a little adapter box.)
This would lower the volume and match the impedance. A resistor should be around $5 or so.
Or, you can shop for another cabinet. If you are near a major city, Craigslist is a good source for used CHEAP stuff.

So, if you like the amp, you have several easy cheap options.


Viera
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Jun 22nd, 2018 06:36 PM   Edit   Profile   Print Topic   Search Topic

Thanks all.

Leftee: Yeah, I read through that thread prior to posting. I didn't see anything specific about 16 ohm into 8 ohm, but amp mad scientist did sum things up pretty well.

Peegoo: Great analogy that even I could understand.

ejm: Thanks for the info. I feel a little silly not checking the amp's manual. That said I would expect for a manufacturer to err on the side of caution.

Either way I'll probably go with a different amp.


5Strats
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Edmond/OKC

GospelBilly!
Jun 23rd, 2018 06:10 AM   Edit   Profile   Print Topic   Search Topic

The manual for the Marshall DLS100H head is not clear enough on this subject in my opinion.

bongo122819
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usa

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Jul 2nd, 2018 03:11 PM   Edit   Profile   Print Topic   Search Topic

for what it's worth, I have the Little Marshall Head and 3 different cabinets.
I tried it thru a Vintage 30/ 16 ohm and it didn't sound as good as thru an 8 ohm Emminence Legend or a Celestion G12/ 8 ohm.
Also, for home use 1 watt can be loud....I love the .1 watt setting.
Nice job Marshall

Viera
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Jul 7th, 2018 10:11 AM   Edit   Profile   Print Topic   Search Topic

Well bongo, it looks like you haven't blown up your amp or speakers playing into 8 ohm speakers. Maybe I'll still get that "Little Marshall Head".

Yes, 1 watt can be plenty loud. I have a Carr Mercury. I mostly play it in the .5 watt or .1 watt settings.

Bubbalou

USA

THE LOW END OF UPPER TEJAS
Jul 7th, 2018 01:34 PM   Edit   Profile   Print Topic   Search Topic

Yes, it takes much less wattage to produce higher (treble) frequency that low frequency so if all you want is higher frequency lead solo tones very small wattage is needed

FDP Forum / Miscellaneous and Non-Fender Topics / 16 Ohm output into an 8 Ohm speaker?




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