LaTeX: How to change size only with titlesec

Question

I need to change the font size of my \subsection headings. Although when I use the

\titleformat{\subsection}{\Large\bfseries}{\thesubsection}{0.7em}{}

command, the font of the heading is also changed. I don't know the exact formating of the heading, so I am searching for a way to just change the size. Can you help? Thanks in advance.

Edit: Example:

\documentclass[DIV12,BCOR10mm,headsepline,twoside,a4paper,11pt]{scrreprt}
\usepackage{ngerman}
\usepackage[ansinew]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{titlesec}

\titleformat{\subsection}{\Large\bfseries}{\thesubsection}{0.7em}{}

\begin{document}

\section{Beschreibung des Steuerungsalgorithmus}
\subsection{Neuer einfahrender Ladungsträger}

\end{document}

The problem is that the titleformat command not only changes the size but also changes the font of my subsection. It doesn't match to the section font anymore. I still want to change the size of subsection.

Edit 2:

The old one is without \titleformat. The new one is with the command, but has the wrong font!

Answer 1

You are using one of the koma-script document classes (scrreport). Within the class files, the section formatting for font (which subsection relies on) is defined in the following way:

\newcommand*{\sectfont}{\normalcolor\sffamily\bfseries}

When you re-define \subsection using the titlesec package with \titleformat{\subsection}{\Large\bfseries}{\thesubsection}{0.7em}{}, you aren't telling LaTeX to use the sffamily font. You could modify this to be \titleformat{\subsection}{\Large\sffamily\bfseries}{\thesubsection}{0.7em}{}, including \sffamily which will give you the result you desire.

However, you can simply do the following (\addtokomafont{subsection}{\Large}), which solves your changing font problem without the need for external packages:

\documentclass[DIV12,BCOR10mm,headsepline,twoside,a4paper,11pt]{scrreprt}
\usepackage{ngerman}
\usepackage[ansinew]{inputenc}
\usepackage[T1]{fontenc}

\addtokomafont{subsection}{\Large}

\begin{document}

\section{Beschreibung des Steuerungsalgorithmus}
\subsection{Neuer einfahrender Ladungsträger}

\end{document}