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Yaqin MC-10T no bass?

Hello all.

I just got myself a Yaqin MC-10T. This is my first venture into better audio stuff and my very first vacuum tube amp. My speakers are a pair of old Wharfendale Emeral 93's that I got on craig's list for real cheap. My music sources so far are either a turntable connected to a Yaqin MS-22b phono stage to the amp or an iphone playing pandora through a usb to a DAC to the amp.

Everything sounds great! I love it more and more every time I listen to it.

Here's the problem. There is almost no bass to this setup. It's like you have a 5.1 setup and someone unplugs the sub woofers. I thought it was the music I was playing but I experimented and its the same thing.

I'm not a bass head and the music I listen to has very little bass anyways, but I just want to know if this is normal or if this is a vacuum amp trait or if there is something wrong with my speakers?

Will the tubes make any difference? I've checked the bias on my current tubes and they are all within range.

Suggestions? Thanks.
tanman2

Showing 1 response by georgehifi

georgehifi's avatar
georgehifi
10,312 posts
 
http://www.salonav.com/arch/2008/10/028-7raz.shtml

The Warfedale 93 is the same as the 95 but smaller box which will make it even harder to drive.

As you can see (link) fourth graph up from the bottom. In the bass the impedance is not too bad (green trace around 50- 200hz), but the phase angle in that area (blue trace) is bad, at even less than -36 degrees around 100hz, which is the punch/power region for the bass, so it needs an amp with a little current grunt.

Your Yaqin MC-10T needs to be run off the 4ohm speaker taps, which will drop it's 40w 8ohm spec even down to 20w and then at that -36 degree dip it will sag the wattage even more.
Then even this may not be enough to get that bass drive you are seeking.

Have you a 100w solid state amp that is ok with 4ohms handy or a friend has that you can try to see if you can get your bass back you want.

Cheers George
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