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Loudspeaker EQ

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Fatmangolf View Drop Down
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    Posted: 22 Aug 2016 at 10:37pm
I have a relatively small living room with large speakers so sit closer to them than the manufacturer probably intended. I have fitted a switch on the underside of the cabinet (on the crossover access panel) that can reduce the tweeter output by about 2dB. The manufacturer had used a 1 ohm wirewound to feed the HPF part of the crossover which is about 8 ohms impedance including the ribbon tweeter, probably to balance the speaker response for expected use in a large room. I inserted a new 2.2 ohm w/w resistor in series with a switch that shorts it out when it is in the forward position.

PMC build a similar switch into the Fact 8 speakers I heard at Phil's place, although his were in a large room and sounded great on 0dB. For my speakers it is a subtle change that allows more toe-in without too much treble at close range.
Jon

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JamesD View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JamesD Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 6:37pm
I did something similar to my speakers when they were in a small room. Now they're in a big room the switch and resistor have been taken out again.

I notice however that my old "bedroom" Pioneer receiver from 1967 (that was their first transistor design and cost the equivalent of £3000 today) has tone controls that must have served a similar purpose.... 😉
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveG Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 7:04pm
I think the same kind of switchable treble response is common in studio monitors too. Makes sense in a smaller room where larger speakers are a bit more difficult to get right. They do often have a sense of effortless dynamics that u rarely get in smaller speakers so probably worth the extra effort.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JamesD Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 8:12pm
If someone cares to give me some 15" Tannoy Monitor Golds to show me effortless dynamics I won't be offended.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 9:39pm
Originally posted by JamesD JamesD wrote:

I did something similar to my speakers when they were in a small room. Now they're in a big room the switch and resistor have been taken out again.

I notice however that my old "bedroom" Pioneer receiver from 1967 (that was their first transistor design and cost the equivalent of £3000 today) has tone controls that must have served a similar purpose.... 😉


Thanks James, I'm relieved I'm not the first to retrofit this kind of switch and I too thought "treble cut" was easier in the old days!
Jon

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Post Options Post Options   Thanks (0) Thanks(0)   Quote morris_minor Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 2016 at 5:03pm
My Dad used to have some Tannoy III LZ speakers which had a couple of controls on the back for treble energy and slope (?). At the time neither he or I knew what to do with them! Shocked
Bob

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 25 Aug 2016 at 10:14pm
I'd never thought much about speaker EQ before as I thought the w/w pots for tweeters in 1970's and 80's were a gimmick and I'd lazily assumed the Tannoy controls were specific to their drivers. It was the graph PMC give for their HF shaping that clicked for me - resistor in series to reduce tweeter level not change the crossover slope.

Jon

Open mind and ears, whilst owning GSP Genera, Accession, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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